MG MGA Twin Cam Instruction manual

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NOTE
Refer to the end of the appropriate Section for the latest instructions when carrying out work on the
vehicle.
Additional copies of this publication (Part No. AKD926B) can only be obtained from an M.G.
Distributor.
Issued by
THE M.G. CAR COMPANY LIMITED
Proprietors: Morris Motors Limited
ABINGDON-ON-THAMES
Exported by
NUFFIELD EXPORTS LIMITED
Proprietors: Morris Motors Limited
COWLEY, OXFORD, ENGLAND

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INTRODUCTION
This Manual has been prepared to provide the service operator with the necessary information for
the maintenance and repair of the M.G. (Series MGA Twin Cam).
The Manual also serves as a ready-reference book for service supervision and covers items of
procedure for the guidance of both the fully qualified and the less-experienced mechanic.
UNIT ARRANGEMENT
In the Manual the complete vehicle is divided into Sections each of which deals with an assembly
or major component and carries a reference letter.
NUMBERING OF PAGES AND ILLUSTRATIONS
The pages and illustrations are numbered consecutively within each Section
SERVICE TOOLS
Use of the correct tools contributes to an efficient, economic, and profitable repair. References
have therefore been made to such tools throughout the Manual.

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CONTENTS
INTRODUCTION .................................................................................................................................................3
GENERAL INFORMATION ................................................................................................................................ 12
PART NAME ALTERNATIVES .......................................................................................................................................... 23
MAINTENANCE ATTENTION.......................................................................................................................... 28
SECTION A THE ENGINE................................................................................................................................36
GENERAL DESCRIPTION ................................................................................................................................................ 36
LUBRICATION SYSTEM .................................................................................................................................................. 36
A.1 DRAINING THE SUMP.............................................................................................................................................. 36
A.2 OIL PRESSURE ......................................................................................................................................................... 37
A.3 OIL PRESSURE RELIEF VALVE................................................................................................................................... 37
A.4 WATER PUMP ......................................................................................................................................................... 37
A.5 CARBURETTERS ...................................................................................................................................................... 37
A.6 INLET MANIFOLD .................................................................................................................................................... 38
A.7 HEADER TANK......................................................................................................................................................... 39
A.8 THERMOSTAT HOUSING......................................................................................................................................... 39
A.9 EXHAUST MANIFOLDS ............................................................................................................................................ 39
A.10 CAMSHAFT DRIVING SPROCKETS.......................................................................................................................... 39
(TRANSVERSE SECTION)THE M.G. SERIES MGA (TWIN CAM)ENGINE .................................................................................... 41
A.11 CAMSHAFTS.......................................................................................................................................................... 41
A.12 CAMSHAFT BEARINGS .......................................................................................................................................... 42
A.13 CYLINDER HEAD .................................................................................................................................................... 42
A.14 DECARBONIZING .................................................................................................................................................. 43
A.15 VALVES ................................................................................................................................................................. 43
A.16 VALVE GUIDES ...................................................................................................................................................... 43
A.17 VALVES AND SEATINGS......................................................................................................................................... 44
A.18 TAPPET CLEARANCES............................................................................................................................................ 45
A.19 VALVE TIMING-CHECKING AND ADJUSTING ......................................................................................................... 46
A.20 TIMING CHAIN-ADJUSTING .................................................................................................................................. 50
A.21 TIMING CHAIN COVER .......................................................................................................................................... 51
A.22 TIMING CHAIN ...................................................................................................................................................... 52
A.23 ENGINE FRONT PLATE........................................................................................................................................... 53
A.24 POWER UNIT......................................................................................................................................................... 53
A.25 SUMP AND OIL PUMP STRAINER .......................................................................................................................... 54
A.26 MAIN AND BIG-END BEARINGS............................................................................................................................. 54
A.27 PISTONS AND CONNECTING RODS ....................................................................................................................... 55
A.28 PISTON RINGS....................................................................................................................................................... 56
A.29 HALF-SPEED SHAFT............................................................................................................................................... 57
A.30 DISTRIBUTOR DRIVE GEAR.................................................................................................................................... 57
A.31 OIL PUMP.............................................................................................................................................................. 58
A.32 FLYWHEEL............................................................................................................................................................. 58
A.33 CRANKSHAFT ........................................................................................................................................................ 59
A.34 CAMSHAFT LOCKING TOOL................................................................................................................................... 59
A.35 FLYWHEEL STARTER RINGS................................................................................................................................... 59
A.36 CONNECTING ROD ASSEMBLIES ........................................................................................................................... 59
A.37 MODIFIED ENGINE MOUNTING............................................................................................................................ 60

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A.38 MODIFIED HALF-SPEED SHAFT AND OIL PUMP DRIVING SPINDLE........................................................................ 61
A.39 MODIFIED PISTONS AND RINGS............................................................................................................................ 61
A.40 MODIFIED CRANKCASE BREATHER PIPE ............................................................................................................... 61
A.41 MODIFIED TAPPETS .............................................................................................................................................. 61
A.42 MODIFIED TIMING COVER GASKET....................................................................................................................... 61
A.43 ALTERNATIVE PISTONS ......................................................................................................................................... 61
SERVICE TOOLS ............................................................................................................................................................. 62
SECTION B THE IGNITION SYSTEM............................................................................................................. 68
DESCRIPTION ................................................................................................................................................................ 68
B.1 LOCATING THE CAUSE OF UNEVEN FIRING ............................................................................................................. 68
B.2 TESTING THE LOW-TENSION CIRCUIT ..................................................................................................................... 68
B.3 LOCATING ALOW-TENSION CIRCUIT FAULT ........................................................................................................... 69
B.4 HIGH-TENSION CABLES........................................................................................................................................... 70
B.5 CONTACT BREAKER................................................................................................................................................. 70
B.6 REMOVING AND REPLACING THE DISTRIBUTOR..................................................................................................... 71
B.7 STATIC IGNITION TIMING........................................................................................................................................ 71
B.8 DISMANTLING THE DISTRIBUTOR ........................................................................................................................... 74
B.9 CAPACITOR ............................................................................................................................................................. 74
B.10 REASSEMBLING THE DISTRIBUTOR ....................................................................................................................... 74
B.11 COIL ...................................................................................................................................................................... 75
B.12 SPARKING PLUGS .................................................................................................................................................. 75
B.13 NEW-TYPE DISTRIBUTOR ...................................................................................................................................... 77
B.14 CHECKING DISTRIBUTOR DRIVE SHAFT BACKLASH ............................................................................................... 77
B.15 CHECKING THE IGNITION TIMING ......................................................................................................................... 79
B.16 NEW-TYPE DISTRIBUTOR ...................................................................................................................................... 79
SECTION C THE COOLING SYSTEM............................................................................................................ 80
DESCRIPTION ................................................................................................................................................................ 80
C.1 REMOVING THE FILLER CAP .................................................................................................................................... 80
C.2 DRAINING THE COOLING SYSTEM........................................................................................................................... 80
C3 FILLING THE COOLING SYSTEM ................................................................................................................................ 81
C.4 REMOVING AND REPLACING THE RADIATOR.......................................................................................................... 81
C.5 DYNAMO AND FAN BELT ADJUSTMENT.................................................................................................................. 81
C.6 COLD WEATHER PRECAUTIONS .............................................................................................................................. 83
C7 REMOVING THE WATER PUMP, ............................................................................................................................... 83
C.8 DISMANTLING AND REASSEMBLING THE WATER PUMP ........................................................................................ 83
THE WATER PUMP AND THERMOSTAT COMPONENTS ................................................................................................ 85
KEY TO THE WATER PUMP AND THERMOSTAT COMPONENTS .................................................................................... 86
C.9 RADIATOR PRESSURE VALVE................................................................................................................................... 87
THE COOLING SYSTEM COMPONENTS.......................................................................................................................... 89
KEY TO THE COOLING SYSTEM COMPONENTS.............................................................................................................. 89
SECTION D THE FUEL SYSTEM.................................................................................................................... 91
KEYTO THE CARBURETTER COMPONENTS ................................................................................................................... 92
D.1 REMOVING THE FUEL TANK.................................................................................................................................... 93
D.2 REMOVING THE FUEL PUMP................................................................................................................................... 93
D.3 CONSTRUCTION OF THE FUEL PUMP...................................................................................................................... 93
D.4 ACTION OF THE FUEL PUMP ................................................................................................................................... 94
D.5 DISMANTLING AND REASSEMBLING THE FUEL PUMP............................................................................................ 94
D.6 RESETTING THE DIAPHRAGM FOR CONTACT BREAKER "THROW-OVER"................................................................ 97

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D7. TRACING FUEL PUMP TROUBLES............................................................................................................................ 99
D.8 FUEL PUMP MAINTENANCE ................................................................................................................................. 100
D.9 CARBURETTERS .................................................................................................................................................... 100
D.10 CARBURETTER ADJUSTMENTS............................................................................................................................ 101
D.11 REMOVING AND REPLACING THE CARBURETTERS ............................................................................................. 104
D.12 CENTERING THE JET............................................................................................................................................ 105
D.13 SOURCES OF CARBURETTER TROUBLE ............................................................................................................... 105
D.14 AIR CLEANERS..................................................................................................................................................... 107
D.15 MODIFIED CARBURETTER DAMPER ASSEMBLIES ............................................................................................... 107
SECTION E THE CLUTCH............................................................................................................................. 108
GENERAL DESCRIPTION .............................................................................................................................................. 109
E.1 ADJUSTMENT........................................................................................................................................................ 110
E.2 MASTER CYLINDER ................................................................................................................................................ 111
E.3 SLAVE CYLINDER ................................................................................................................................................... 112
E.4 BLEEDING THE CLUTCH SYSTEM............................................................................................................................ 113
E.5 REMOVING THE CLUTCH ....................................................................................................................................... 113
E.6 DISMANTLING THE CLUTCH .................................................................................................................................. 114
E.7 ASSEMBLING THE CLUTCH .................................................................................................................................... 115
E.8 ADJUSTING THE RELEASE LEVERS.......................................................................................................................... 115
E.9 REFITTING THE CLUTCH......................................................................................................................................... 116
E.10 SERVICING THE CLUTCH ...................................................................................................................................... 116
SERVICE TOOLS ........................................................................................................................................................... 120
SECTION F THE GEARBOX..................................................................................................................... 121
GENERAL DESCRIPTION .............................................................................................................................................. 124
F.1 REMOVING THE GEARBOX .................................................................................................................................... 124
F.2 DISMANTLING THE GEARBOX ............................................................................................................................... 124
F.3 DISMANTLING THE THIRD MOTION SHAFT ........................................................................................................... 125
F.4 ASSEMBLING THE THIRD MOTON SHAFT .............................................................................................................. 125
F.5 LAYSHAFT GEAR .................................................................................................................................................... 125
F.6 ASSEMBLING THE FIRST MOTION SHAFT............................................................................................................... 126
F.7 ASSEMBLING THE REAR EXTENSION ..................................................................................................................... 126
F.8 ASSEMBLING THE GEARBOX ................................................................................................................................. 126
F.9 RENEWING THE GEARBOX EXTENSION OIL SEAL................................................................................................... 127
F.10 REFITTING THE GEARBOX FRONT COVER ............................................................................................................ 127
SERVICE TOOLS ........................................................................................................................................................... 128
SECTION G THE PROPELLER SHAFT....................................................................................................... 131
GENERAL DESCRIPTION .............................................................................................................................................. 131
G.1 LUBRICATING THE UNIVERSAL JOINTS.................................................................................................................. 131
G.2 TESTING FOR WEAR.............................................................................................................................................. 131
G.3 REMOVING THE PROPELLER SHAFT...................................................................................................................... 132
G.4 DISMANTLING THE PROPELLER SHAFT ................................................................................................................. 132
G.5 TO EXAMINE AND CHECK FOR WEAR.................................................................................................................... 134
G.6 REASSEMBLING THE SHAFT .................................................................................................................................. 134
G.7 REPLACING THE PROPELLER SHAFT ...................................................................................................................... 134
G.8 MODIFIED PROPELLER SHAFT............................................................................................................................... 135
SECTION H THE REAR AXLE ...................................................................................................................... 136
KEY TO THE REAR AXLE COMPONENTS ....................................................................................................................... 137

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GENERAL DESCRIPTION .............................................................................................................................................. 138
LUBRICATION.............................................................................................................................................................. 138
H.1 REMOVING AND REPLACING AHUB EXTENSION AND AXLE SHAFT ...................................................................... 139
H.2 REMOVING AND REPLACING AHUB ..................................................................................................................... 139
H.3 RENEWING THE BEVEL PINION OIL SEAL............................................................................................................... 140
H.4 REMOVING THE DIFFERENTIAL PINIONS .............................................................................................................. 140
H.5 REPLACING THE DIFFERENTIAL PINIONS .............................................................................................................. 141
H.6 DISMANTLING THE CROWN WHEEL AND PINION................................................................................................. 141
H.7 ASSEMBLING AND SETTING THE CROWN WHEEL AND PINION ............................................................................ 142
H.8 REMOVING AND REFITTING THE AXLE.................................................................................................................. 151
SERVICE TOOLS ........................................................................................................................................................... 154
SECTION J THE STEERING GEAR ............................................................................................................ 158
KEY THE STEERING GEAR ............................................................................................................................................ 159
GENERAL DESCRIPTION .............................................................................................................................................. 160
MAINTENANCE ........................................................................................................................................................... 160
J.1 REMOVING AND REPLACING THE STEERING WHEEL ............................................................................................. 160
J.2 REMOVING THE STEERING COLUMN ..................................................................................................................... 161
J.3 REMOVING THE STEERING COLUMN BUSHES........................................................................................................ 161
J.4 REMOVING THE STEERING COLUMN UNIVERSAL JOINT........................................................................................ 161
J.5 DISMANTLING THE UNIVERSAL JOINT ................................................................................................................... 161
J.6 REMOVING AND REPLACING THE STEERING GEARBOX ......................................................................................... 162
J.7 DISMANTLING THE STEERING GEARBOX ............................................................................................................... 162
J.8 REASSEMBLING THE STEERING GEAR .................................................................................................................... 163
J.9 STEERING COLUMN ALIGNMENT........................................................................................................................... 164
J.10 CHECKING AND ADJUSTING FRONT WHEEL ALIGNMENT .................................................................................... 165
J.11 FITTING AN ADJUSTABLE STEERING COLUMN ..................................................................................................... 166
SERVICE TOOLS ........................................................................................................................................................... 166
SECTION K THE FRONT SUSPENSION..................................................................................................... 167
KEY TO THE FRONT SUSPENSION COMPONENTS........................................................................................................ 168
GENERAL DESCRIPTION .............................................................................................................................................. 168
K.1 REMOVING THE FRONT SUSPENSION ................................................................................................................... 169
K.2 DISMANTLING THE SWIVEL PINS........................................................................................................................... 170
K.3 EXAMINING PARTS FOR WEAR.............................................................................................................................. 170
K.4 REASSEMBLING THE SWIVEL PINS ........................................................................................................................ 171
K.5 REPLACING THE FRONT SUSPENSION ................................................................................................................... 172
K.6 REMOVING AND DISMANTLING AFRONT HUB..................................................................................................... 173
K.7 REASSEMBLING AND REPLACING AFRONT HUB................................................................................................... 173
K.8 ADJUSTING THE FRONT HUB BEARINGS................................................................................................................ 173
K.9 REMOVING AND REPLACING THE FRONT COIL SPRING......................................................................................... 174
K.10 FITTING NEW RUBBER BUSHES ........................................................................................................................... 175
K.11 ANTI-ROLL BAR ASSEMBLY.................................................................................................................................. 176
K.12 FITTING THE ANTI-ROLL BAR............................................................................................................................... 176
SERVICE TOOLS ........................................................................................................................................................... 177
K.10 THE ANTI-ROLL BAR EQUIPMENT COMPONENTS ............................................................................................... 178
SECTION L THE HYDRAULIC DAMPERS .................................................................................................. 179
MAINTENANCE ........................................................................................................................................................... 179
L.1 TOPPING UP .......................................................................................................................................................... 179
L.2 REMOVING AND REPLACING REAR DAMPERS....................................................................................................... 179

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L.3 REMOVING AFRONT DAMPER .............................................................................................................................. 180
L.4 TESTING THE DAMPERS......................................................................................................................................... 180
SECTION M THE BRAKING SYSTEM ......................................................................................................... 181
GENERAL DESCRIPTION .............................................................................................................................................. 181
BRAKE UNITS .............................................................................................................................................................. 181
MASTER CYLINDER...................................................................................................................................................... 181
MAINTENANCE ........................................................................................................................................................... 182
M.1 ADJUSTING THE BRAKE PEDAL............................................................................................................................. 182
M.2 PRIMING AND BLEEDING THE BRAKE SYSTEM (EXPELLING AIR) .............................................................................. 183
M.3 REMOVING THE MASTER CYLINDER .................................................................................................................... 183
M.4 DISMANTLING THE MASTER CYLINDER............................................................................................................... 184
M.5 ASSEMBLING THE MASTER CYLINDER.................................................................................................................. 184
M.6 REPLACING THE MASTER CYLINDER .................................................................................................................... 185
M.7 REMOVING ABRAKE UNIT ................................................................................................................................... 185
M.8 DISMANTLING ABRAKE UNIT .............................................................................................................................. 186
M.9 ASSEMBLING ABRAKE UNIT ................................................................................................................................ 187
M.10 REPLACING ABRAKE UNIT ................................................................................................................................. 188
M.11 REMOVING THE FRICTION PADS........................................................................................................................ 188
M.12 REPLACING THE FRICTION PADS........................................................................................................................ 188
M.13 RELINING THE HAND BRAKE .............................................................................................................................. 189
M.14 ADJUSTING THE HAND BRAKE ........................................................................................................................... 189
M.15 REMOVING THE HAND BRAKE CABLE ................................................................................................................ 190
M.16 REMOVING ABRAKE DISC.................................................................................................................................. 190
M.17 REPLACING ABRAKE DISC.................................................................................................................................. 190
M.18 FLEXIBLE HOSES................................................................................................................................................. 191
SERVICE TOOL............................................................................................................................................................. 192
SECTION N. ELECTRICAL EQUIPMENT.................................................................................................... 193
GENERAL DESCRIPTION .............................................................................................................................................. 193
N.1 BATTERY MAINTENANCE...................................................................................................................................... 193
N.2 DYNAMO .............................................................................................................................................................. 195
N.3 REMOVING AND REPLACING THE DYNAMO......................................................................................................... 196
N.4 DISMANTLING THE DYNAMO ............................................................................................................................... 196
N.5 SERVICING THE DYNAMO ..................................................................................................................................... 196
N.6 THE STARTER ........................................................................................................................................................ 199
N.7 REMOVING AND REPLACING THE STARTER.......................................................................................................... 199
N.8 SERVICING THE STARTER ...................................................................................................................................... 199
N.9 THE CONTROL BOX ............................................................................................................................................... 201
N.10 FUSES ................................................................................................................................................................. 204
N.11 THE ELECTRIC HORN ........................................................................................................................................... 204
N.12 FLASHING DIRECTION INDICATORS .................................................................................................................... 204
N.13 THE WINDSHIELD WIPER .................................................................................................................................... 205
N.14 THE HEADLAMPS ................................................................................................................................................ 207
N.15 THE LIGHT UNITS ................................................................................................................................................ 207
N.16 REMOVING THE LIGHT UNITS ............................................................................................................................. 207
N.17 SETTING THE HEADLAMPS.................................................................................................................................. 207
N.18 REPLACING HEADLAMP BULBS........................................................................................................................... 208
N.19 REPLACING THE LIGHT UNITS ............................................................................................................................. 209
N.20 THE TAIL-LAMPS AND STOP-LIGHTS ................................................................................................................... 209
N.21 CLEANING THE LAMPS........................................................................................................................................ 209

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N.22 THE SIDELAMPS.................................................................................................................................................. 209
N.23 THE NUMBER-PLATE ILLUMINATION ................................................................................................................. 209
N.24 THE PANEL AND WARNING LIGHTS .................................................................................................................... 210
WIRING DIAGRAM ...................................................................................................................................................... 211
KEY TO WIRING COLOURS........................................................................................................................................... 213
N.25 REPLACEMENT BULBS........................................................................................................................................ 213
N.26 FITTING AFOG LAMP.......................................................................................................................................... 214
N.27 LOCATION AND REMEDY OF FAULTS .................................................................................................................. 214
CHARGING CIRCUIT .................................................................................................................................................... 215
STARTER MOTOR ........................................................................................................................................................ 215
LIGHTING CIRCUITS..................................................................................................................................................... 216
WINDOWLESS YOKE DYNAMO ................................................................................................................................... 216
N.29 MODIFIED CONTROL BOX................................................................................................................................... 216
N.30 HEADLAMP BEAM SETTING................................................................................................................................ 217
N.31 DRY-CHARGED BATTERIES.................................................................................................................................. 217
N.32 MODIFIED EUROPEAN LIGHT UNIT..................................................................................................................... 218
SECTION NN (MGA 1600)............................................................................................................................. 219
KEY TO WIRING DIAGRAM (R.H.D., AND L.H.D.).......................................................................................................... 221
CABLE COLOUR CODE ................................................................................................................................................. 221
NN.1 FRONT PILOT AND FLASHING INDICATOR LAMPS .............................................................................................. 222
NN.2 REAR FLASHING INDICATOR LAMPS................................................................................................................... 222
NN.3 REPLACEMENT BULBS........................................................................................................................................ 222
NN.4 HEADLAMPS ...................................................................................................................................................... 223
NN.5 LUCAS C4011 DYNAMO...................................................................................................................................... 223
NN.6 DISMANTLING AC40/1 DYNAMO ...................................................................................................................... 223
NN.7 SERVICING AC40/1 DYNAMO ............................................................................................................................ 225
NN.8 MODIFIED RB106/2 CONTROL BOX.................................................................................................................... 225
NN.9 MK.II SEALED-BEAM HEADLAMPS ..................................................................................................................... 226
SECTION O THE WHEELS, TYRES, AND JACKING................................................................................. 227
GENERAL..................................................................................................................................................................... 227
O.1 TYRE MAINTENANCE ............................................................................................................................................ 227
O.2 JACKING UP THE CAR............................................................................................................................................ 228
O.3 REMOVING AND REPLACING ROAD WHEELS........................................................................................................ 228
O.4 VALVES ................................................................................................................................................................. 229
O.5 TYRE REMOVAL .................................................................................................................................................... 229
O.6 THE IMPORTANCE OF BALANCE ........................................................................................................................... 230
O.7 FITTING TYRES AND TUBES ................................................................................................................................... 230
SECTION P LUBRICATION........................................................................................................................... 234
P.1 DAILY SERVICE....................................................................................................................................................... 235
P.2 1,000 MILES (1600 KM.) SERVICE........................................................................................................................... 235
P. 33,000 MILES (4800 KM.) SERVICE .......................................................................................................................... 237
P.4 6,000 MILES (9600 KM.) SERVICE........................................................................................................................... 239
P.5 12,000 MILES (19200 KM.) SERVICE....................................................................................................................... 243
SECTION R THE CHASSIS........................................................................................................................... 245
GENERAL DESCRIPTION .............................................................................................................................................. 245
R.1 FRAME REPAIRS .................................................................................................................................................... 245
R.2 INVESTIGATION OF DAMAGED CHASSIS ............................................................................................................... 246

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R.3 ATWISTED FRAME................................................................................................................................................ 246
R.4 DIAGONAL FRAME CHECK..................................................................................................................................... 248
SECTION S THE BODY ................................................................................................................................. 249
S.1 REMOVING ADOOR LOCK..................................................................................................................................... 249
S.2 REMOVING THE WINDSHIELD ............................................................................................................................... 249
S.3 REMOVING THE FRONT BUMPER.......................................................................................................................... 249
S.4 REMOVING THE REAR BUMPER ............................................................................................................................ 250
S.5 REMOVING THE HOOD.......................................................................................................................................... 250
S.6 REMOVING AREAR WING ..................................................................................................................................... 250
S.7 REMOVING AFRONT WING................................................................................................................................... 250
S.8 REMOVING THE BODY........................................................................................................................................... 251
S.9 FITTING THE OPTIONAL HEATING AND DEMISTING EQUIPMENT ......................................................................... 252
S.10 COLD AIR VENTILATION EQUIPMENT.................................................................................................................. 255
S.11 MAINTENANCE OF BODYWORK AND UPHOLSTERY ............................................................................................ 258
S.12 REGLAZING THE WINDSHIELD ............................................................................................................................. 258
S.13 REMOVING THE WINDSHIELD (COUPÉ)............................................................................................................... 259
S.14 REMOVING AND REPLACING THE REAR LIGHT (COUPÉ....................................................................................... 260
S.15 REMOVING ADOOR LOCK OR WINDOW REGULATOR (COUPÉ) .......................................................................... 261
S.16 REMOVING THE HEAD LINER (COUPÉ) ................................................................................................................ 262
S.17 MODIFIED WHEEL ARCHES.................................................................................................................................. 262
S.18 MODIFIED BODIES............................................................................................................................................... 262
LUBRICATION CHART.................................................................................................................................. 263
KEY TO LUBRICATION CHART ...................................................................................................................................... 264

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GENERAL INFORMATION
CONTROLS
Handbrake
The hand brake lever is located alongside the driver's seat and operates the rear wheel brakes only.
To operate, pull up the lever and press the knob in the end with the thumb to lock the lever in position.
To release the brakes, pull upwards on the lever to automatically release the lock and then push
downwards.
Always apply the hand brake when parking.
Brake pedal
The pedal operates the hydraulic brakes on all four wheels and will also operate the twin stop warning
lamps when the ignition is switched on.
The location of the driving controls
1. Bonnet release.
5. Clutch pedal.
9. Foot brake.
2. Gear lever.
6. Accelerator.
10. Seat lock.
3. Gearbox oil filler plug.
7. Seat lock,
4. Headlamp dip switch.
8. Hand brake lever.

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Gear lever
The four forward gears and the reverse gear are engaged by moving the lever to the positions
indicated in the illustration.
To engage the reverse gear,move the lever to the left of the neutral position until resistance is felt, apply side
pressure to the lever to overcome the resistance and then pull it backwards to engage the gear.
Synchromesh engagement is provided on second, third and fourth gears.
Seat adjustment
A lever is provided at the front of each seat and this must be pressed outwards to release the catches and
allow the seat to slide.
Steering column adjustment
This enables the steering wheel to be placed in the most comfortable driving position after slackening a
clamp bolt below the wheel hub.
Headlamp beam dip switch
This is situated on the left of the clutch pedal and is foot operated. The switch will dip the headlamp
beams on one depression and raise them on the next.
Bonnet lock release
The bonnet is hinged at the rear and the lock is released by pulling on the ring below the instrument panel on
the extreme left-hand side of the car. The bonnet is still held by the safety catch, which must be released
before the bonnet can be raised. To re-lock the bonnet in the fully closed position after opening, press
downwards on the front of the bonnet until the lock is heard to engage.
INSTRUMENT PANEL
The right-hand side of the instrument panel (R.H.D.)
1. Headlamp and sidelamp switch
6. Trip mileage
11. Revolution indicator..

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2. Fog lamp switch.
7. Flasher warning light
12. Ignition warning light..
3. Oil gauge
8. Horn button.
13. Headlamp beam warning light,.
4. Panel light switch
9. Starter switch
14. Total mileage..
5. Speedometer
10. Water temperature gauge
Speedometer
The speedometer also records the trip and total distances. The trip recorder is reset to zero by pushing
upwards theknob below the instrument and turning it anti-clockwise.
Mainbeam warning light
The warning light at the bottom of the speedometer dial glows red when the headlamp main beams are in
use, as a reminder to dip the beams when approaching other traffic.
Engine revolution indicator
This dial is calibrated in hundreds of revolutions per minute. Normal use of the engine will not require speeds
over 5,000 RPM. and great care must be taken if the needle does approach the amber sector of the dial, which
commences at 5,500 RPM. Under favourable conditions the needle may be allowed to enter the amber sector
but under no circumstances must it enter the red sector.
Ignition warning light
The warning light at the bottom of the revolution indicator dial glows red when the ignition is switched on and
will go out again when the engine is started, and its speed is increased sufficiently for the dynamo to charge
the battery. Should the light glow at all engine speeds, the dynamo is not charging the battery.
Oil pressure gauge
The pressure of the oil should be between 30 lb./sq. in. and 80 lb./sq. in. (2.1kg. /cm 2and5.6kg./cm.2)under normal
running conditions. Approximately10 lb./sq. in. (.7 kg. /cm.2) should be shown when the engine is idling.
Water temperature gauge
The temperature of the cooling water leaving the cylinder head is indicated by this gauge and should be
approximately 160° F. when the engine is running normally.
Starter switch
Pull out the knob marked 'S' to operate the starter motor. The switch must be pushed in immediately the
engine starts.
Lamp switch
To switch on the sidelamps, tail-lamps, and number-plate illumination lamp pull out the knob marked `L'.
Turn the knob clockwise and pull out again to switch on the headlamps.
SeeHeadlamp beam dip switch' and'Mainbeam warning light'.
Foglampswitch
A fog lamp is not fitted as standard equipment, but the switch marked 'F' on the instrument panel is

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connected to the battery and is ready for use when a fog lamp is connected to it. Pull out the knob to switch
on the fog lamp.
The left-hand side of the Instrument panel (R.H.D.)
1. Map-reading light switch
5. Windshield washer control
2. Windshield wiper switch
6. Fuel gauge
3. Ignition switch
7. Choke control.
4. Map-reading light
8. Horn button.
Panel lamp switch
To illuminate the instruments, turn the control knob clockwise. The first movement of the knob will switch on
the lamps and further turning to the right will dim the lamps. The panel lamps will only operate when the
sidelamps are also switched on.
Direction indicatorswitch
The lever-type switch on the outer edge of the panel controls the flashing indicator unit. The unit will operate only
while the ignition is switched on and flashes the sidelamp and tail lamp, on the side of the car to which the switch
lever is moved, until it is automatically switched off. While the flashing unit is switched on, the warning light next
to the switch will show green.
Fuel gauge
This operates only when the ignition is switched on.
Chokeormixturecontrol
To enrich the mixture and assist starting when the engine is cold, pull out the knob marked 'C' and lock it in
position by turning it anti-clockwise. Turn the knob clockwise and push it inwards to the normal running position
as soon as the engine is warm enough to run without the rich mixture. Never allow the engine to run for any
length of time with the knob pulled out.

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Ignition switch
The fuel pump and gauge are brought into action by this switch, which is also the master switch for the
windshield wipers and direction indicators.
Windshield wiper switch
The windshield wipers are self-parking and operate only when the ignition is switched on. Pull out the
control 'W' to set the wiper blades in motion. Push in the knob to switch off the motor and park the
blades.
Map-reading lamp
The map-reading lamp is controlled by the adjacent knob, which must be pulled out to switch on the
light. The lamp will only operate while the sidelamps are switched on.
Windshield washer
When windshield-washing equipment is fitted it is operated by the knob marked 'Push' below the fuel
gauge
HEATING AND DEMISTING EQUIPMENT
The 2.75-kw. heating and demisting unit is fitted as an extra to standard equipment (see Section S.9).
Fresh air is ducted from the radiator grille to the heating element and blower motor mounted below the
Bonnet. Water from the engine cooling system is used to heat the element.
Warmed air issues from the toeboard or the windshield demisting vents according to the position of the
controls mounted below the instrument panel
Air
The left-hand knob controls the air supply. When the knob is pushed in the air duct is open and air at
atmospheric temperature will enter the car when it is in motion and will issue from the toeboard or demisting
vents.
While the control is pushed in it may be turned clockwise to switch on the blower motor, if the ignition is
switched on also, and this will increase the flow of air into the car unit and may be used to give a supply of air
when the car is stationary.
If the blower motor is switched off by the air control, the knob can be pulled outwards to close the air duct and
prevent fresh air entering the car from the toeboard or windshield vents. The blower cannot be switched on
while the knob is pulled out.
NOTE: -The heating and demisting equipment control panel fitted to some cars has the blower motor operating
switch incorporated in the temperature control lever. These control panels may be identified by the temperature
leverknob,whichis round and markedPull out the knob to switch on the blower motor.
The left-hand control on these panels will regulate the air supply only

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The circulation of the air through the heater unit with the controls positioned as recommended on
Heater operation
Demist
The right-hand knob on the heater unit control panel operates a shutter in the panel above the gearbox
cover When the control is pushed into the normal position the shutter is open and most of the air from the
unit will enter the car at the toeboard while some will issue from the vents below the windshield. As the
knob is pulled out the shutter closes, and more air is delivered to the car from the demisting vents, giving
the maximum supply of air to the windshield. This is the demist position of the control if the blower is
switched on and also die defrost position if the heater is operating.
Temperature
The temperature lever operates the water valve on the engine. When the lever is in the left-hand Position the
hot water supply is cut off and air entering the car through the unit will not be heated. As the lever is moved
to the right the water supply is increased and the maximum temperature is obtained.
As a general guide, here are some of the more frequently required positions:
1. No additional ventilation or heating. Pull out the air control, push the temperature control to the left.
2. Hot weather. Push in the air and demist controls. Move the temperature control to the left. To

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increase the supply of air switch on the blower motor.
3. Warm weather. Set the controls as for hot weather. To increase the supply of air switch on the blower
motor. To prevent mist forming on the windshield pull out the demist control partially.
4. Cold weather. Place the air control in its normal position. Place the temperature lever according to
the degree of heating required. Switch on the blower to increase the air supply. (If demisting is
required pull out the demist control).
5. Severe cold. Move the temperature control to the right for maximum heating and pull out the demist
control fully to give a maximum supply of hot air to the screen. Switch on the blower motor to
increase the air flow.
WINDSHIELD WASHER
The washing equipment supplied as an
optional fitting is operated by pumping the
knob on the instrument panel. As the knob
moves towards the panel a jet of cleaning
fluid is ejected onto the windshield from
nozzles on the scuttle.
Set the windshield wipers in motion before
operating the cleaning jets.
Fluid for the windshield is stored in an
unbreakable bottle clipped to the engine
bulkhead. When refilling with fluid, lift the
bottle from its clip and unscrew the cap.
FOLDING THE HOOD
Never fold the hood if it is wet or damp; wait until it is dry.
1. Release the hood from the pillars at the top of the windshield by unscrewing the wing bolts
2. Release the rear bottom edge of the hood from the three buttons and the turnbuckle at each side.
Pull on the centre knob of each button to release them from their attachment pins.
3. Raise the front of the hood slightly to release the tension in the canvas and pull to the rear the bottom
of the hood where it is attached to the tonneau panel to release it from the two anchor brackets on
the panel.
4. Tip the seats forward, unfasten the sidescreen container, and turn it over onto the tonneau panel to
expose the hood stowage compartment.
5. Leave the rear window panel suspended over the tonneau panel and collapse the hood into the
stowage compartment, pulling the canvas clear of the hood irons and folding it forward over the front
hood rail.
6. Fold the rear window forward over the hood, pulling out the spare canvas at each side and folding it
neatly over the front of the window.
7. Push the hood into the stowage compartment and turn the sidescreen container forward to cover
the hood
8. Remove the sidescreen and stow them in the container pockets with the cranked bracket of each
screen at opposite ends and facing towards the rear.
9. Secure the sidescreen container over the folded hood with the six buttons (three on each side).
10. Tighten the sidescreen clamping nut on each door to prevent its possible loss.
Operatingthe windshield washer

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OPTIONAL FITTINGS
The following items of equipment are available as optional fittings:
Tonneau cover.
Radiator blind.
Heating and demisting equipment.
Twin horns.
Fog lamps.
Cigar lighter.
H.M.V. car radio (provision has been made
for easy installation).
Windshield washer.
Detachable hard-top.
Sliding windows.
Competition windshield assembly
Luggage carrier
Wing driving mirror.
Cold air ventilation kit.
Ashtray.
Badge bar.
Sun visors (Coupé only).
Adjustable telescopic steering column.
Competition de-luxe seats.
Close-ratio gearbox.
SERIAL NUMBERS
The major components of the vehicle have serial numbers, and these will be found in the positions illustrated
on pages General Information 6 and 7. When in communication with the Company or your Dealer always
quote the engine number and car number complete with prefixes. The registration number is of no assistance
and is not required. Write your name and address clearly.
Chassis Number. This is stamped on the
identification plate and should be quoted with its
prefix. The plate is secured to the top left-hand
side of the dash panel
Engine Number. Stamped on a plate at the rear of
the engine behind the cylinder block

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Gearbox Number. Stamped on top of the
gearbox casing adjacent to the dipstick
Body Number. Stamped on a plate secured to the
right-hand side of the dash panel
Rear Axle Number. Stamped on the front of
the left-hand rear axle tube
POWER UNIT SERIAL NUMBER CODING
The engine number and later engines comprises a series of letters and numbers, presenting in code
the capacity, make, and type of unit, gearbox and ancillaries fitted, and the type of compression
together with the serial number of the unit.