Lotus Europa Instruction manual

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LOTUS EUROPA
ALL MODELS
Workshop Manual
LOTUS CARS LIMITED
Norwich Norfolk, Nor. 92W England
Telephone: Wymohdham 3411. Cables: Lotus. NORWICH Telex: 97401
Part No A046T0327Z June 1974 ©

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CONTENTS.
Technical Data
Chassis A
Body B
Rear Suspension D
Engine E
Transmission F
Wheels and Tyres G
Steering H
Braking System J
Cooling System K
Fuel System L
Electrical Equipment M
Lubrication and Maintenance O
Heater P
Clutch Q
Exhaust System S

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INTRODUCTION
This publication is a combined manual covering all models of the Lotus Europa. The front part deals
with the features which are peculiar to the Twin Cam and Special models, whereas the latter part of the
manual covers the Series 1 and 2 models, and components fitted to Twin Cam and Special which are
also fitted on Series 1 and 2 models.

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TECHNICAL DATA.
DIMENSIONS
Wheelbase 233.7 cm. (92 in.)
Track – Front 135.8 cm. (53.5 in.)
- Rear 134.6 cm. (53 in.)
Overall - Length 400 cm. (157½ in.)
-Width 163.8 cm. (64½ in.)
- Height 107.9 cm. (42½ in.)
Ground Clearance (design) 15 cm. (6 in.)
Turning Circle 12.5m. (41 ft.)
Weight (unladen) 686 kg. (1,513 lbs.)
CAPACITIES.
Engine Sump (including filter) 4 litres (7½ pts.; 9 U.S. pts.)
Transmission 1.75 litres (3 pts.; 3.6 U.S. pts:)
Coolant (with heater) 10.8 litres (19 pts.; 22.8 U.S. pts.)
Fuel 56 litres (12.5 gal.; 15 U.S. gall.)
ENGINE.
General
Number of cylinders 4
Capacity 1558 cc. (95.06 cu. in.)
Stroke 72.746 mm. (2.864 in.)
Bore - Grade 1 82.550/82.558 mm. (3.2500/3.2503 in.)
- Grade 2 82.558/82.565 mm. (3.2503/3.2506 in.)
- Grade 3 82.565/82.573 mm. (3.2506/3.2509 in.)
- Grade 4 82.573/82.580 mm. (3.2509/3.2512 in.)
Compression - Ratio - Europa TC
(All Territories) 9.5 : 1
- Europa Special
(UK & Export) 10.3 : 1
- Europa Special
(N. America) 9.5 : 1
- Pressure at sea level
(All models, all Territories) In excess of 11.248 kg.cm.sq. (160 lbs.sq.in.)
Each cylinder within 1.41 kg.cm.sq.
(20 lbs .sq .in.) of each other.

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Cylinder Head
Material Aluminium
Gasket Copper/asbestos
Valve timing - Inlet opens 26° B.T.D.C.
- Inlet closes 66° A.B.D.C.
- Exhaust opens 66° B.B.D.C.
- Exhaust closes 26° A.T.D.C.
Angle of valve seats and faces 45°
Valves:
Head diameter- Inlet - Europa TC 38.760/38.862 mm. (1.526/1.530 in.)
(UK & Export)
- Europa TC 39.624/39.776 mm. (1.560/1.566 in.)
(N. America)
- Europa Special 39.624/39.776 mm. (1.560/1.566 in.)
(All Territories)
- Exhaust 33.553/33.655 mm. (1.321/1.325 in.)
(All models, all Territories)
Stem diameter - Inlet and Exhaust 7.874/7.899 mm. (.310/.311 in.)
Stem clearance in guide - Inlet .007/.058 mm. (.0003/.0023 in.)
- Exhaust .063/.076 mm. (.0025/.0030 in.)
Clearance (cold) - Inlet .127/.177 mm. (.005/.007 in.)
- Exhaust .228/.279 mm. (.009/.011 in.)
Valve Springs:
Type Dual
Free length - Inner 28.70 mm. (1.130 in.)
- Outer 36.83 mm. (1.450 in.)
Rate - Inner @ 23.4 mm. (.92 in.) 5.6kg. (12.41bs.)
- I[email protected] mm. (.58 in.) 15.2kg. (33.51bs.)
- Outer @ 29.7 mm. (1.17 in.) 20.4 kg. (45.0 lbs.)
- Outer @ 21.1 mm. (.83 in.) 49.4 kg. (109 lbs.)
Valve guides:
Length - Inlet 36.608 mm. (1.520 in.)
- Exhaust 37.592 mm. (1.480 in.)
External diameter - Std. 12.700/12.713 mm. (.500/.5005 in.)
- O/size 12.852/12.865 mm. (.5060/.5065 in.)
Interference fit (all) .0127/.0381 mm. ( .0005/.0015 in.)
Fitted height above cylinder head 8.128 mm. (.320 in.)
Internal diameter (all) ream after fitting 7.907/7.932 mm. (.3113/3123 in.)

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Bore in cylinder head - Std. 12.674/12.687 mm. (.499/.4995 in.)
- O/size 12.872/12.839 mm. (.505/.5055 in.)
Camshafts
Journal diameter 25.4/25.413 mm. (1.000/1.0005 in.)
End Float .076/.254 mm. (.003/.010 in.)
Bearings - Number 5
- Type Steel backed white metal
- Running clearance .013/.050 mm. (.0005/.002 in.)
Cam followers:
Bore in head 34.925/34.940 mm. (1.375/1.3756 in.)
Outside diameter 34.904/34.91 2 mm. (1.3742/1.3745 in.)
Follower to head clearance .013/.036 mm. (.0005/.0014 in.)
Jackshaft
Bearings - Number 3
- Type Steel backed white metal
- Length - Front 19.05 mm. (.75 in.)
- Centre 16.26 mm. (.64 in.)
- Rear 19.05 mm. (.75 in.)
- Running clearance .025/.050 mm. (.001/.002 in.)
Journal diameter 39.624/39.637 mm. (1.560/1.5605 in.)
End float .063/.190 mm. (.0025/.0075 in.)
Crankshaft
Balance Within 14.42 gr. cm. (2 oz. in.)
Diameter - Main journals 53.987/54.000 mm. (2.1255/2.1260 in.)
-Crankpin 49.199/49.211 mm. (1.9370/1.9375 in.)
End float - Dimension .076/.203 mm. (.003/.008 in.)
- Controlled by Thrust washers on centre main bearing
Bearings - Number 5
- Type Steel backed, lead bronze with lead overlay
- Running clearance .038/.076 mm. (.0015/.0030 in.)
Maximum undersize for re-grind .762 mm. (.03 in.)
Flywheel
Maximum run out (lateral) .101 mm. (.004 in.)
Starter ring gear - Run out - Lateral .406 mm. (.016 in.)
- Radial .152 mm. (.006 in.)

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Connecting Rod
Type 'H' Section
Material Steel forging
Distance between centres 12.19/12.24 cm. (4.799/4.801 in.)
Bearings - Type Steel backed, lead bronze with lead overlay
- Running clearance .013/.513 mm. (.0005/.0022 in.)
- End float on crankpin .101/.254 mm. (.004/.010 in.)
Small end bore (bushed) :
Grade 'A' (silver) 20.635/20.637 mm. (.8124/.8125 in.)
Grade 'B' (green) 20.637/20.642 mm. (.8125/.8127 in.)
Gudgeon (piston) pin
Type Floating
Location Circlips
Diameter - Grade 'A' 20.627//20.628 mm. (.8121//.8122 in.)
- Grade 'B' 20.628//20.632 mm. (.8122//.8123 in.)
Class of fit Finger push fit
Piston
Type Solid skirt
Material Tin plated aluminium alloy
Length 68.250 mm. (2.687 in.)
Compression Height 39.014//39.065 mm. (1.536/1.538 in.)
Maximum permissible weight variation 4 grammes
per set
Rings - Compression 2
- Oil Control 1
Diameter - Grade 1 82.466/82.474 mm. (3.2467//3.2470 in.)
-Grade 2 82.474/82.481 mm. (3.2470/3.2473 in.)
- Grade 3 82.481/82.489 mm. (3.2473/'3.2476 in.)
- Grade 4 82.489/82.497 mm. (3.2476/3.2379 in.)
Piston clearance in cylinder bore .076/.091 mm. (.0030/.0036 in.)
Gudgeon pin bore offset 1.016 mm. (.04 in.) towards thrust face
Ring gap (fitted) - Compression .229/.356 mm. (.009//.014 in.)
- Oil control .254/.508 mm. (.010//.020 in.)

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Piston ring to groove clearance:
- Compression .041/.091mm. (.0016/.0036 in.)
- Oil control .046/.097 mm. (.0018/.0038 in.)
LUBRICATION SYSTEM
Pump: - Type. Eccentric Lobe
- Drive. Gear on Jackshaft
Inner and outer rotor clearance .15 mm. (.006 in.) Maximum
Inner and outer rotor float .13 mm. (.005 in.) Maximum
Outer rotor to housing clearance .25 mm. (.010 in.) Maximum
Normal pressure (hot) 2.4/2.8 kg. cm. sq. (35/40 lbs. in. sq.)
Filter Full flow (throw away canister)
FUEL SYSTEM
Pump - Operation Lever by eccentric on Jackshaft
- Pressure .087/.176 kg. cm. sq. (1.25/2.5 lbs. in. sq)
Air cleaner type Paper element, dry
Carburetter -Type and number Dellorto 40 DHLA, two
- Slow running speed 800 r .p.m.
- Settings:
Choke 30 mm.
Main jet 115
Main air corrector jet 160
Slow running jet 50
Slow running air corrector jet 7850 - 2
Pump jet 8083.40
Starter jet 70
Main emulsion tube 7772 - 1
Starter emulsion tube 7482 - 1
Needle valve 7180 - 15
Air trumpet length 4.44 cm. (1.75 in.)

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Carburetter - Type and number Zenith-Stromberg 175 CD 2SE
- Slow running speed 800/900r.p.m.
Settings:
Needle B. 1G
Spring colour Light blue
Damper oil SAE 20W/50
IGNITION SYSTEM
Type Coil and distributor
Firing Order 1,3,4,2,
No l Cylinder Nearest to front of car
Ignition advance control Fully automatic
Ignition timing (static):
Dellorto Carburetters 12º B.T.D.C.
Zenith-Stromberg Carburetters 5° B.T.DC.
Coil Lucas LA.12
Sparking plugs - Type Champion N7Y
- Gap .584/.635 mm. (.023/.025 in.)
*The above ignition setting may need SLIGHT alteration to meet local fuel requirements.
Distributor
Type 23 D.4
Direction of rotation (from above) Anti-clockwise
Drive Gear on jackshaft
Contact breaker gap .35/.40 mm. (.014/.016 in.)
Contact lever spring tension .51/.68 kg. (18/24 oz.)
Firing angles 0°, 90°, 180°, 270° ± l0
Cam dwell angle 60° * 3°
Dispatch no. - Dellorto carbs. 41189
- Zenith-Stromberg carbs. 41225 when suction retard capsule fitted