Volvo Penta MB 10 A User manual

Publ. No. 2505 B
Feb.1914
instruction bool<
marine carburetor engine
MB 1OA

FOREWORD
Before you start using your new Volvo Penta marine engine, we recommend you to
read this instruction book carefully. lt contains all the instructions you need to run
and service your engine in the best possible way.
The dependabi lity and the lifetime of your engine and equipment depend to a great
extent on how these units are given service and maintenance. Always closely fol low
the instructions included ln this book.
Volvo Penta has built a world wide service organization including service workshops
with specially trained personnel at your service.
Always contact your nearest Volvo Penta representative should you need advice
and also when you rsqLrile se'vice or pdrts.
We are fully convinced that the demands concerning good running economy and
outstanding performance you have every right to make on a high quallty product
such as this will be more than satisfied and that your Volvo Penta will provide you
with a lonq period of faithf ul service.
GUARANTEE
Each engine is accompanied by a warranty certificate which entitles the first
purchaser to a guarantee concerning both materials and Iabour. The extent of the
guarantee is shown in the warranty card and we recommend you to read this
caref u I ly.
This certificate contains report forms which are filled in by the dealer and/or
boatbu i lder.
lf our guarantee is to be valid, we make one absolute condition and that is that the
checking procedures in the maintenance scheme are carried out and that your
engine and its equipment are always looked after in accordance with the
instructions in this book. when in doubt, please always contact a Volvo penta
authorized dealer.
ln all correspondence with your dealer and also when ordering spare parts, always
state the type designation and serial number of the engine and reverse gear (see
front of engine).
CONTENTS
Presentation
Running the unit
I nstru mentation and controls
GENERAL INSTRUCTIONS
Fuel and lubricating oil recommendations
R un ni ng-i n
Recommended engine speed
Precautions to be taken in case of frost .
RUNNING
Procedure beforestartinS . . . .
Starti ng
Stopping
Technical description
Engine unit . .
Lubricating system
Fuel system
Cooling system
Electrical system
Wiring diagram
Reverse and reduction gear .
4
4
4
5
5
5
o
7
1
7
8
a
I
10
Servicing
Maintenancescheme ...... .11
Periodical servicing 12-16
General servicing instructions 17-24
Technical Data
Tracing faults in case of running interruptions
25-26
..27

PRESENTATION
MBlOA
2-cvl. - 15 h.p.
Fig. 1. MB10A, with MS reverse- and reduction gear,
starboard side
Fig. 2. MB10A, with MS reverse gear, port side
2
1. Distributor
2. Spark plug
3. Oilfilter (Later prod.)
4. Oil pressure sender
5. Carburetor with
flame arrester
6. Water-cooled ex-
haust manifold
7. Rocker arm cover
B. Sea-water pump
9. Oil dipstick, rever-
se gear
1 0. Reduction/reverse
gear l\,4S. ratio
1.91 : 1
1 1. Starter-generator
1 2. Lifting eyelet
1 3. Thermostat and
water distributing
housing
14. lgnition coil
1 5. Reverse gear MS,
ratio 1 I 1
16. Control arm for
reverse gear
17. Fuel pump with
hand primer
18. Oil dipstick, engine
INSTRUMENTATION
CONTROLS
RUNNING THE UNIT
2.
1. Warning lamp f or battery
charging
Red light - no charging
Switch for extra electrical
equ ipment
3. Key switch with built-in star-
ter
4. Warning lamp for oil pressure
Red light - stop engine, insuf-
ficient oil pressure
1. Control Iever
2. l\eutral throttle knob.
Push the button when the
control lever is in neutral and
move the lever forward a bit.
Release the button. The gear
cannot be engaged. Push in
the button again and pull
back the lever for synchroni-
zed throttling and shifting.
N = Neutral position
F - Forward posltion
R = Reverse position
T = Throttle
.J
Fig.3. lnstrument panel, MB10A
Fig 4. Combined cortrol

RUNNING THE UNIT
GENERAL INSTRUCTIONS
FUEL AND LUBRICATING OIL RECOMMENDATIONS
NOTE. Our guarantee only applies on condition that the following fuel and
I u bricating oi I recommendations are f ol lowed :
Fuel quality
The engine is intended to be run on petrol with an octane rating of minimum B0
ROT (Research Method).
Lubricating oil quality
Only Multigrade oil SAE 1O W30 with quality designation "For Service SE"1) is to
be used for lubricating the engine and reverse gear. This oil contains additives which
ensure maximum lifetime for the engine and reverse gear under different conditions
of operations.
RUNNING.IN
When your marine engine is new, we recommend that you run it with a certain
amount of care during the first 20 hours of operation. During this time, never
subject the engine to full loading for more than brief periods, because it is during
this period that the moving parts wear in together.
Oil changes
During the running-in period, the engine and reverse gear lubricating oilshould be
changed more frequently than usual. Change the engine oil, reverse gear oil and the
oil filter after 20 hours of operation, see also under "Servicing", points 3 and 4.
RECOMMENDED ENGINE SPEED
lf your are to get the very best performance from your boat, it is important that
the propeller is selected so that maximum engine speed is reached with a normally
loaded boat. See under "Technical Data".
NOTE. When the boat has been in the water for some considerable time, maximum
engine speed can decrease if there is marine growth on the bottom of the boat. Use
therefore anti-fouling bottom paint. Check and clean the bottom of the boat at
regular intervals.
1) Previous designation "For Service MS".
4
RUNNING THE UNIT
Precautions to be taken in case of frost
lf there is risk of frost, drain off the cooling water to prevent cracks in the engine
block and reduction gear caused by the water freezing. Note the risk of water
getting into the boat. See also under the heading "Procedure to be followed when
laying up a boat" (Page22).
RUNNING
Procedu re bef ore starting
1 . Make sure that the engine compartment is well ventilated'
2. check the lubricating oil levels in the engine and reverse gear, see under
"Servicing", points 1 and 2.
3. Check the fuel level in the tank and open the cock for fuel supply to the
engine- At the same time, check all fuel cocks, pipelines and screw unions for
leakage.
4. Check that the drain cock for the cooling water is closed. Note. The drain plug
for the reduction gear. See Fig. 22. Open the bottom cock for the cooling
water intake (if one is fitted).
5. Switch on the master switch for the electrrcal system (if one is fitted) and
pump out any bilge water that may have collected.
6. Make sure that the equipment on board includes a fire extinguisher, life vests,
anchor, mooring lines and other safety equipment.
Starting
1. Move the control lever to the neutral position so that the shift mechanism
disengages. See the directions given in Fig. 4. Push forward the speed control
to approx. 1/4 throttle. lf the engine is cold, the choke must be completely
closed. The choke should not be used when starting a warm engine.
2. Turn the key switch one step to the right. Check that the warning lamps for
battery charging and low oil pressure light up.
3. Press in the key switch and turn it further to the right, this cutting in the
starter-generator. Release the key as soon as the engine starts. Never race a cold
engine.
4. lf the battery is so flat that it is difficult to start the engine, the engine can be
started with the help of the starting crank (available as accessory).
5. Check immediately after starting that the warning lamps for oil pressure and
battery charging have gone out. Should the red oil warning lamp remain on -
stop the engine immediatelY.
6. Check the cooling water circulation by observing that the water is being
discharged overboard. Run the engine warm at fast idling RPM. Do not let the
engine run with the choke more than several minutes and never when the
engine is completely warm.
1. Move the control lever to neutral in order to engage the shift mechanlsm (see
Fig. 4). The boat is now ready for operation.

RUNNING THE UNIT
Stopping
1. Move the control lever to neutral position and let the engine run some minutes
at idling speed before stopping it.
2. Turn the key switch to neutral position when the engine has stopped. NOTE.
The master switch must never be switched off before the engine has completely
stopped.
3. Switch off the master switch (if fitted) and close the fuel and cooling water
cocks if the unit is to remain idle for some considerable time.
4. lf the unit is to remain idle for more than two weeks, special inhibiting
measures must be taken with the engine (see under "Procedure if unit is to
remain idle").
lf the engine has electrical equipment, this equipment should be sprayed
regularly with f luid which protects agalnst corrosion and moisture.
TECHNICAL DESCRIPTION
TECHNICAL DESCRIPTION
ENGINE UNIT
The MBl0A is a 2-cylinder,4-stroke petrol engine, specially constructed for marine
use.
The cylinder block and crankcase are made in one piece. The crankcase is provided
with a bottom cover. The cylinder bores, which are surrounded by cooling jackets,
are drilled directly in the cylinder block.
The crankshaft is carried in two main bearings. The bearing shells are replaceable
and have bearing metal of indium-plated lead-bronze.
LUBRICATING SYSTEM
The engine is fitted with a complete pressure lubricating system. The oil filter is of
the full-flow type and is replaceable as a unit. lt is provided with an overf low valve.
The lubricating system has a relief valve which prevents the oil pressure from
reachi n g excessive val ues.
FUEL SYSTEM
The engine fuel system consists of a fuel pump, carburetor with flame arrester,
intake manifold and fuel lines.
The fuel pump is of the diaphragm type and is actuated by a cam on the engine
camshaft. A hand priming device on the feed pump makes it possible to pump the
fuel even when the engine is stopped.
Fig. 6. Longitudinal section of engine
Fig. 5. Cross-section of engine

TECHNICAL DESCRIPTION
COOLING SYSTEM
The engine and reduction gear are sea-water cooled and the system is fitted with a
thermoitat which controls the temperature of the engine" Cooling water circulation
is taken care of by means of a sea-water pump mounted on the timing gear housing.
The pump is driven from the camshaft through a flange. The pump impel ler is made
of neoprene rubber and operates against a cam. The pumpsucks cooling water from
the sea through the water intake. The water is then forced under pressure through
the exhaust manifold cool ing iackets and fi lls the engine water channels.
On top of the engine there is a water distributing housing provided with a
thermostat. When the engine is cold, the cooling channels in the engine and exhaust
manifold are filled with cooling water which is rapidly heated up. when the
thermostat is closed, the surplus water passes through the distributing housing and
on to the water-cooled exhaust elbow where it mixes with the exhaust gases or is
conveyed overboard, depending on whether a wet or dry exhaust line has been
i nsta I led.
The cooling water in the engine cooling channels is rapidly heated up and this
causes the thermostat to open and force the cooling water to pass the engine
cooling channels before it enters the exhaust elbow. Thethermostat thus regulates
the cooling water circulation so that the engine always has the right temperature
irrespective of the size of the engine load.
Fig. 7. Setting the two-way cock for outgoing cooling water
The cock can be locked in the desired position with a screw, see arrows
A = Setting with drY exhaust line
B = Setting with wet exhaust line
ELECTRICAL SYSTEM
The electrical system has a voltage of 12 volts and is designed specially for marine
USC.
The engine is equipped with a starter-generator, which means that the generator and
starter motor are combined and are driven by vee-belts from the engine f lywheel.
I
TECHNICAL DESCRIPTION
Warning!
The following applies to an engine fitted with alternator and master switch:
Never break the circuit between the alternator and battery while the engine
is running. To do this would be to ruin the charging regulator immediately.
Do not switch off the master switch until the engine has stopped. See also
under "Servicing", point 16.
Wiring diagram, MB10A
Cable marking
Mark Colour sq.mm. AWG
15
13
15
o
13
I
5
15
t5
4E
I N5IRUMENI
IN5TRUiltNT
Black i.5
Black 2.5
lvory i.5
lvory 6
Red 2.5
Red 6
Red 16
Brown 1.5
Green 1.5
Blue 1-5
B
A
Fiq.8. Wiring diagram, MBl0Awith
Sl BA starter generator.
Components
1. Key switch
2. Warning lamp f or "low oil pressure'
3. Battery charging warning lamp
4. Switch {extra)
5. Connection terminal
6. Connection terminal
l. Battery
8.
9.
10.
11.
12.
13.
14.
Master switch
Starter-generator
Charging regulator
Fuse
Oil pressure sensor
lgnition coil
Distributor
I

TECHNICAL DESCRIPTION
Fig 9. Wiring diagrams, MB10A with Bosch
starter generator
1. Key switch with star- 7. Oil pressure sender
PERIODICAL SERVICING
MAINTENANCE SCHEME
The numbers of the servicing procedures below refer to the detailed descriptions on
the following pages. Some of these operations require specialized mechanical
knowledge and the use of special tools. For this reason, these operations should be
carried out by an authorized service workshop.
1 ) Or once each season should this occur first
2) Daily bef ore starting for f irst time
3) Every other year or when engine is taken out of boat
4) Change the oil filter after every 100 hours running or once each season
ter co ntact
2. Extra switch
3. Battery charging war
ning lamp
4. Oil pressure warning 12. Fuse
8. lgnitlon coil
9. Distributor
1 0. Starter generator
1 1. Cable harness
13. Charging regulator
14. Battery
15. Master switch
lamp
5. Connector
6. Connector 6
Reverse gear, type Mono Shift (MS)
The Volvo Penta reverse gear, type Mono Shift, has a ratio of i:1 and, as
alternative, a reduction gear wlth reduction ratio 1.91:1. The reduction gear is
integrally built with the reverse gear.
Power is transmitted f rom the engine to reverse gear through a rubber f lange.
For manoeuvering "Forward" and "Reverse", the Volvo Penta patented cone
clutch is used. With this type of clutch, engagement is both smooth and quiet.
Very little force is required to operate the reverse gear.
The engaging power of the cone clutch is influenced by the size of the power
transmission torque. The greater the torque, the stiffer will be the clutch engagement
with increased throttling.
10
See
point Operation
Every
14
days
Afterl )
50 hours
ru nni ng
Afterl)
1 0O hours
runni ng
PERIODICAL SERVICING
Check oil level in engine azl
2Check oil level in reverse gear azl
.t- Change oil in engine and change oil filter .4)
4. Chanqe oil in reverse and reduction qear a
5. Clean oil strainer 3)
6. Clean air cleaner o
1. Check vee-belts a
8. Check valve clearances o
9. Check and clean fuel filter a
'1 0. Check battery electrolyte level o
11 Check and chanqe spark plugs a
GENERAL SERVICING INSTRUCTIONS
To be carried out
according to the inter-
vals given under respect-
tive points or when
necessary
12. Check-tighten cylinder head bolts
13. lgnition timing and distributor
14. Adjust carburetor
i5. Cooling system
i6. Electrical system
11 .Check reverse and reduction gear
18. Procedure if unit is to remain idle and
i nhi biti ng
11

PERIODICAL SERVICING
1.
Checking oil level in engine
Check the oil level in the engine daily before starting for the f irst time. The dipstick
is located on the port side of the engine and has upper and lower markings. The oil
level must never be allowed to go down below the lower mark and it should not be
above the upper mark since this can result in abnormally high oil consumptlon.
Remove the dipstick plug (see Fig. 12\ to fill with oil. Concerning the oil quality
and viscosity, see point 3.
Fig. 10. Checking engine oil level Fig. 11. Checking reverse gear oil level
1. Oil f illing
2. Dipstick
2.
Checking oil level in reverse and reduction gear
The MS reverse anh reduction gear has a separate oil compartment. Check the oil
level daily before starting for the first time with the help of the dipstick which is
located on the starboard side of the reverse gear. The oil level should be between the
max. min. marks on the dipstick (which must not be Screwed down when measuring
the oil level). When necessary, top up with new oil (see 1, Fig. 11). Concerning the
oil quality and viscosity, see point 4.
3.
Changing the engine oil and oil filter
Change the lubricating oil after every 50 hours running or at least once each season.
During the running-in period the oil should be changed after 20 hours of operation.
Run the engine warm before changing oil. The oil issucked upfromthe'crankcase
with the help of a scavenging pump, the tube of which rs inserted through the dip-
srick hole. The scavenging pump is supplied with the tool kit. Oil is added to the
enqine afterremoval of the plug through which the dipstick is tnserted, see Fig. 12a.
Concerning the oil quality and viscosity, see the table.
12
PERIODICAL SERVICING
Change the oil filter after every 100 hours running at the same time as the oil is
changed. ln the case of a new or reconditioned engine, the oil filter should also be
changed for the fi rst time after 20 hours running (see "Running-in the engine").
The oil filter is changed as fol lows:
Unscrew the old filter (see Fig 12bl .lf it remains firmly in position and cannot be
loosened, use a special tensioning tool or pierce the outer part of the filter with a
screwdriver that can be used as a lever. Remember that oil can spill out.
Make sure that the contact surface against the engine block is clean. Smear the new
filter rubber gasket with oil and screw on the fi lter by hand until it just comes into
contact with the contact surface of the engine block.
Tighten the {ilter a further half turn but no more. Start the engine and run it at
idling speed while checking to make sure there is no leakage at the filter.
Always check the oil level after changing the oll filter or changing the engine oil.
Quality Viscosity
Multigrade oil Oil capacity, litres (lmp. qts. = US qts.)
Excl. oil filter I lncl. filter
Service SEl )SAE 1OW/30 approx. 1 .5 (1 .3 = 1 .6) 1.75 (1 55 =
1.85)
1) Previous designation Service MS
$m
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Fig. 10. Checking engine oil level
Fig. 12a. Hole for oil fi lling Fi g. 1 2b. Oi I f ilter
13

PERIODICAL SERVICING
4.
Changing oil in reverse gear and reduction gear
Change the lubricating oil in the reverse gear and reduction gear after every 50 hours
running or at least once each season.
During the running-in period the oil should be changed after 20 hours of operation.
The oil is drained through the reverse gear drain hole or is sucked up with the help
of an oil scavenging pump through the hole for the dipstick. When adding oil, f ill up
to the upper mark on the oil dipstick, see table below. I
PERIODICAL SERVICING
Fig. 13. Cleaning air cleaner, arrow Fig. 14. Checking belt tension
shows lock screwl )
Test the belt tensioning by pressing in the belts midway between the starter-genera-
tor and flywheel. lt should be possible to press them in about 3-4 mm (1/8")
under normal thumb pressure, see Fig. 14.
lf an alternator is fitted, the vee-belt tension should be so hard that it is just
possible to get the pulley to slip by turning with one finger a wing on the alternator
fa n.
lf the belt is insufficiently tensioned, loosen the tensioner arm as well as the bolts
at the alternator attaching points. Tension the belt by moving the alternator
outwards and re-tigh.ten the screws.
8.
Ghecking valve clearances
Check the engine valve clearances after every 100 hours running or at least once
each season. Concerning valve clearances, see under "Technical Data". Any valve
adjustment wlll involve grinding valve stem ends and seats and for this reason this
should be carried out by an authorized Volvo Penta service workshop'
9.
Checking and cleaning fuel filter
The fuel filter should be cleaned after every 50 hours running or at least once each
season.
Wash the outside of the fuel pump clean and remove the cover and fuel filter, see
Fig. 15. Clean the filter and re-fit it, with the pins facing upwards. Check the
packing and re-fit the cover. Pump forward fuel with the hand primer and carefully
check to make sure that the gasket does not leak. lf the pumping effect is poor,
turn over the engine a bit so that the fuel pump drive cam alters its position. lf an
oil
quality Viscosity Multigrade oil Oil capacity
litres (lmp. qts. = US qts.)
excl. red. gear I incl. red. gear
min. I rna*. lmin. I max.
Service SE1 )SAE 1OW/30 0.35
(0.31 =
0.37 )
0.45
(0.40 =
0.48)
0.50
(o.44 =
0.53)
0.60
(0.53 =
0.64)
1) Previous designation "Service MS"
5.
Cleaning the oil strainer
An oil strainer is built into the engine bottom cover. The oil strainer should be
cleaned in white spirit at least every other year or when the engine is taken out of
the boat. Use a new gasket for the bottom cover and check for leakage after filling
with oil.
6.
Cleaning the air cleaner
The air cleaner should be removed and cleaned after every 100 hours running, or
once each season.
1. Release the lock screw with a screwdriver and remove the cleaner. See Fig. 13.
2. Clean the air cleaner in white spirit and soak it in engine oil.
3. Allow the engine oil to run off and re-fit the cleaner.
7.
Checking the vee-belts
Check the vee-belttension afterevery 50 hours running. The belts can start slipping
due to wear or grease.
14
I
ll
1) Late prod. type provided with clanrp
15

PERIODICAL SERVICING
extra fuel filter with water separator is fitted (Fig. 15), the transparent container
should be checked for any water in the fuel. The water can be removed through the
Qrain cock in the bottom of the filter container. Look out for fuel splash. The filter
element should be changed at least once each season.
',* æ., \,
Itlkail \
Fis. 15.
Cleaning fuel f ilter Extra fuel filter with water separa-
tor
10.
Checking electrolyte level in battery
Check the battery electrolyte level at least every 14 days. The level should be
between 5 and 10 mm (1 14 and 112"1 over the cell plates. Add distilled water
whenever necessary. Never add too much since the electrolyte can then splash out
and cause corrosion damage. Never check the electrolyte level by using a lighted
match since gas formed in the battery cells is highly explosive.
11.
Checking and changing the spark plugs
Check the spark plug gap and wear at least after every 50 hours of operation. The
electrode gap should be 0.7 mm (0.028") and this must be checked by using a wire
type gauge. lf the electrodes are burnt or the insulation damaged, the plugs must be
replaced immediately. lf necessary, clean the plugs with a wire brush. Make sure
that you always get the right type of spark plugs with the correct heat range and
also that the plugs are tightened to the correct torque. (See Technical Data.)
to
SERVICING
GENERAL SERVICING INSTRUCTIONS
12.
Check-tightening cylinder head bolts
With a new engine or when the cylinder head has been removed, the cylinder head
bolts should be re-tightened after 20 hours running. Check-tightening of the bolts
should also be carried out once each season and always with a torque wrench.
Concerning tightening torque, see "Technical Data".
Fig. 16. Tightening sequence for
cylinder head bolts
13.
lgnition timing and distributor
All adjusting work on the engine ignition system should be carried out by a service
workshop with the special equipment required for this purpose. The ignition system
is one of the most sensitive parts of the engine and interference here immediately
leads to decreased engine output, high fuel consumption and, in the worst cases,
serious engine damage.
The ignition timing and the distributor should be checked once each season.
IGNITION TIMING
The ignition timing is checked only with the help of a stroboscope at the speeds
specified in the Technical Data On the oil pump housing there is a notch and on
the flywheel timing marks, see Fig. '1 7.
@
oo@
11

SERVICING
DISTRIBUTOR
Check the contact breaker points which must not be burned on the contact
surfaces. Turn the engine over until the breaker points are fully open and check the
breaker gap, A in Fig. 18, which should be 0.4 mm (0.016"). Make sure that the
contacts are correctly located vertically so that the faces are completely opposite
each other. The gap can be adjusted by turning the fixed contact (2, Fig.18), after
the lock screw for the attaching plate has been slackened.
Lubricate the distributor with a few drops of engine oil in the drive shaft
lubricating wick (i) under the rotor. Lubricate also with oil the lubricator (3) under
the distributor.
lnspect the distributor cap for cracks and clean all contact surfaces thoroughly.
Check that the center contact stud is not loose and is not worn. See Fig. 19.
Fig. 18. Distributor, adjusting breaker
contacts
-)
Fig. 17. Timinq marks
1B
Fig. 19. Distributor, checklng contact surfaces
19
SERVICING
14.
Adjusting the carburetor
The carburetor should be checked and adjusted by an authorized Volvo Penta
service workshop.
Adjusting the idling speed
1. Check when the throttle control is in neutral position that the connecting
sleeve of the control cable has a clearance of 1.5 mm \1 116"1 (A, Fig.20) on
each side of the "dice". Adiustments can be made partly with the carburetor
lever and partly with the control lever.
2. Run the engine warm and check the idling speed, see under "Technical Data".
Adjust the idling screw (1, Fig. 20) when necessary. lf the engine runs
unevenly, adjust the air screw (2) until even running is obtained. Check to
make sure that the connection sleeve for the control cable has the proper
clearance according to point 1.
Fig. 20. Carburetor, Solex 26VBN2
'1 . ld ling screw
2. Air screw
A = 1.5 mm (1/16")
15.
Cooling system
The cooling system slroLrld lxt clrrtckr:d regularly for leakage, deposits, etc.
The thermostat can be insJ-rcclt:d aftt:r thc water distributor housing has been
removed.

SERVICING
REPLACING THE SEA.WATER PUMP IMPELLER
The pump impeller is made of neoprene rubber and this can be damaged in the case
of water deficiency caused by, for example, blocking of the sea-water inlet. The
pump impeller is changed as fol lows:
1. Close the bottom cock. Remove the cover from the sea-water pump. Note the
risk of water getting into the boat. With the help of two screwdrivers pullthe
shaft with the pump impeller out of the housing as far as necessary in order to
reach the bolt retaining the impeller. See Fig 21. NOTE. Place some kind of
protection under the screwdrivers in order not to damage the impeller housing.
2. Pull the impeller off the shaft. Clean the inside of the pump housing and fit the
new impeller.
3. Fit the cover with its original gasket which has the right thickness. Always have
a spare impeller on board. Open the bottom cock.
Fig.21 . Removing impeller.
Arrow points to impeller
lock bolt
16.
Electrical system
CHECKING THE STATE OF CHARGE OF THE BATTERY
The state of charge of the battery should be checked at least once each season. This
is done by using a hydrometer which shows the specific gravity of the electrolyte,
this varying with the state of charge. (See under "Technical Data".)
CABLES AND CABLE TERMINALS
At regular intervals check that all cable terminals are properly tightened and that
none of the cables is damaged.
STARTE R-GENERATOR
All work on the starter-generator (and alternator lf fitted) should be carried out by
an authorized service workshop. lnspection and control should be done when the
engine is given a qeneral overhaul.
20
SERVICING
NOTE. This is particularly important when the engine is fitted with an alternator.
The battery poles and cable clamps should be well tightened and smeared with
grease or vaseline.
WARNING!
lf the alternator and its regulator are to function perfectly, it is extremely
important that the following instructions are followed:
1. Never break the circuit between the alternator and battery while the engine is
running. The result will be a short-circuit in the regulatorwhich is immediately
ru ined.
The master switch must never be switched off before the engine has completely
stopped.
2. Never confuse the battery poles with one another. The poles are generally
stamped with a plus and a minus sign respectively. The minus pole must always
be earthed to the engine block.
3. Use only Volvo Penta double diode kits when charging two batteries from one
generator.
4. ln the case of starting by using a spare battery, this should be done as follows:
Let the ordinary battery remain connected in circuit. Connect the spare
battery to the ordinary battery, plus to plus and minus to minus. When the
englne starts disconnect the spare battery but never break the circuit to the
ordinary batlery.
Never use a rapid charger while the alternator is connected to the battery.
Always disconnect both battery cables before carrying out any work on the
alternator equipment.
7. lf electric welding work is to be carried out on the engine or installation units,
disconnect the charging regulator cables at the alternator and insulate.
8. Check vee-belt tension and cable connections at regular intervals.
17.
Ghecking the reverse gear and reduction gear
The reverse gear and reduction gear should be checked regularly for oil leakage,
abnormal noise or excessive operatinq temperature.
When remote control is connected, it must be so designed that there is no constant
pressure on the control components of the reverse gear. When reverse gear is enga-
ged for "Forward" or "Reverse", the remote control should be completely off-
loaded. Adjust if necessary by loosening the lock nut and turning the cable "dice".
5.
6.
21

SERVICING
18.
Procedure if unit is to remain idle
IDLE PERIOD WITH BOAT AFLOAT
ln case of an idle period of less than one month with the boat afloat, the engine
should be started and run warm after at least every 14 days to prevent corrosion
damage to the internal parts of the engine.
lf the engine is to remain idle for a longer period than one month, then the engine
should be inhibited, see under "Procedure before laying up"
Protect the engine and equipment from external corrosion damage by regularly
spraying unpainted surfaces and electrical components with corrosion and moisture
protection spray.
We also recommencl that the cylinders are sprayed through the spark plug holes in
the case of longer intervals of idleness.
PROCEDURE BEFORE LAYING UP
Before the boat is taken up on land for laying up, it is advisable to let an authorized
service workshop test the engine and reverse gear. lt is also advisable to carry out a
compression test on the engine.
PREPARE THE ENGINE FOR LAYING UP BEFORE THE BOAT IS LIFTED OUT OF THE
WATEB AS FOLLOWS:
1. Run the engine warm, stop it and pump all the lubricating oil out of the engine
and reverse gear with the help of the scavening pump.
2. Fill up the engine and reverse gear with inhibiting oil to the lowest mark on the
dlpstick. Suitable inhibiting oils are Esso Rust Ban 623, Shell Ensis Oil20 or
corresponding oils of another make.
3. Run the engine off-load for about 5 minutes.
AFTER THE BOAT HAS BEEN LIFTED ASHORE, CARRV OUT THE FOLLOWING
PROCEDURE:
1. lnhibit the cooling system as follows:
a. Drain off all cool ing water from the engine and exhaust manifold by
opening the drain cock (on the starboard side) and from the reduction gear
by opening the drain plug, see Fig. 22. Then close the cock and drain plug.
b. Mix rustproofing agent in a container filled with at least 20 litres (3 1/2
lmp. galls. - 4112 US galls.) of fresh water. The rustproofing agent used
should be of the emulsifying type, for example, Esso Cutwell 40, Shell
Donax C or similar. Add 20 % rustproofing oil to the water and stir well.
NOTE. Always add the oil to the water and never the other way around.
22
SERVICING
c. Disconnect the suction line between the cooling water pump and bottom
intake from the pump. When a reduction gear is f itted to the reverse gear,
disconnect the suction line between the reduction gear and the bottom
intake from Lhe reduction gear.
d. lnstead connect a 112" rubber hose, the length of which should be
sufficient to reach down to the bottom of the containerwith rustproofing
m ixtu re.
e. lnsert the connected suction hose into the container. Start the engine and
let it run at idling until the water has been sucked out of the contatner,
this forming a protective oil film in all the cooling channels. NOTE. Never
let the engine run dry since this can damage the cooling water impeller.
Then connect the coolinct water hose.
f. Drain all cooling water from the engine by opening the drain cock, see
Fig. 22. The rustproofing mixture does not protect the engine against
frost. lf the engine is fitted with a wet exhaust line, this should also be
drained of water. When a reduction gear is fitted, this should be drained of
cooling water through the plug in the bottom of the reduction gear.
S. Drain the cooling water pump by removing the pump cover. Take out the
impeller (see under "Servicing", point 15) forwinter storage. Let the drive
shaft remain in position and re-f it the cover.
Remove the spark plug and spray each cylinder with inhibiting oil. Then turn
over the engine several turns before re-fitting the spark plugs.
Fig.22. Drain cock for cooling water, engine
1. Dr,rin,.ock fr'r ( ooling water, engine
2. Drain pluq for oooling water, reduction gear
LJ

J-
4.
SERVICING
Clean the outside of the engine and reverse gear with white spirit or similar and
touch up damaged paintwork. Protect all unpainted parts and the electrical
system by spraying them with corrosion and moisture protective spray.
Bemove the battery and put it into storage. lt must be re-charged at regular
intervals if it ls to be kept in good condition.
PROCEDURE WHEN LAUNCHING
1. Pump out all the rustproofing oil from the engine and reverse gear, see unCer
"Servicing", points 3 and 4.
2. Fill the engine and reverse gear with lubricating oil, see under "Servicing",
points 3 and 4.
3. Fit the pump impeller in the cooling water pump, see under "Servicing",
point 15, and connect all hoses and check-tighten the hose clamps.
Clean the outside of the engine and reverse gear of rustproofing oil and adjust
the operating controls.
Take a fully charged battery on board and connect up the battery cables.
NOTE. Be careful not to confuse the cables (see under "Servicing", point 16).
The negative battery pole should be earthed to the engine.
Grease in the battery cable clamps with grease or vaseline before tightening.
Remove the spark plugs and turn over the engine several turns with the starter-
generator in order to blow out any rustproofing oil which may be on the
tops of the pistons. NOTE. Prevent oil splash. Re-fit the spark plugs, see under
"Technical Data" for their tightening torque.
CIose the drain cock for the cooling system. Note. The plug for the reduction
gear. Open the bottom cock for the cooling water intake.
Launch the boat and fill the fuel tank. Clean the fuel filter (see point 9) and
pump forward fuel with the help of the hand primer. Check thoroughly the
tank, lines, connections and cocks to be absolutely sure that there is no
leakage.
Start the engine and follow carefully the running instructions given on pages
5*6. Run the engine warm with the reverse gear engaged. Check to make sure
there is no leakage of fuel, water, oil, air or exhaust gases. lf there is, attend to
it immediately. Check the bolts and nuts for tightness.
Contact an authorized Volvo Penta service workshop and have servicing of the
engine and reverse gear carried out as specified in the maintenance scheme.
4.
5.
6.
8.
9.
10.
14 25
TECHNICAL DATA
General
Type desingation
Max. output, h.p.
Max. speed, r.p.m.
Number of cylinders
Type of operation
Displacement, cc (cu. in. )
Bore mm (in.)
Stroke, mm {in.) . .
Compression ratio
Compression pressure ({ully open throttle), speed, kp/cm2 (p.s.i.) . . .
ldling speed, r.p.m
Total weight, approx. kg (lb.), engine + reverse gear
Max. inclination of enqine in boat underway
Valves
Valve clearances, warm enginel )
lnlet valve, mm {in.)
Exhaust valve, mm (in.)
Valve clearances, cold enginel i
lnlet valve, mm (in.)
Exhaust valve, mm (in.)
Reverse gear
Type designa t ion
Ratio "Forward" and "Reverse
Ralio with auxiliarV gear
Lubricating system
Engine
Oil quality
V iscosity
Oil capacity, engine, litres (lmp. qts. = US qts.), approx.
excl. filter
incl. filter
Oil pressure, warm engine, idling speed, tp/cm2 (p.s.i.)
at full speed, kp/cm2 {p.s.i.)
Reverse gear
Oil quality/Viscosity
Oil capacity. litrer (lmp. qt. = US qt.) . . .
Oilcapacity with auxiliary gear, litre (lmp. qt. = USqt.)
1 ) Adjustment is carriåd out bv grinding valve stem ends and seats
2) Previous desiqnation "service MS"
MBiOA
15
2000
2 in-line
Side-valve, 4-stroke
carburetor engine
1018 {62.1 )
88.9 (3.50)
82 (3.23\
6.5:1
7.5 1101\
600
1 15 (253)
1Bo
. o.35 (0.014)
0.30 {0.012)
0.35 (0.014)
0.45 (0.018)
Volvo Penta MS
1.1
1 91:'1
l\/lultigrade oll
Service SE2)
SAE 1OW/30
1.5 (1.3 = 1.6)
1.75 (1.55 = 1.85)
1-2 r4-28)
4 l51l
Same as engine
0.4 (0.35 = 0.42)
0.55 (o.48 = O.5B)

SERVICING
Fuel system
Carburetor, Solex type 26 VBN2
Main jet 102.5
ldling iet 45
Float valve 1.2
Fuel pump feed pressure, kplcm2 (p.s.i.) . o.2 (3)
Petrol grade
Octane rating ROT, min.
lgnition system
Cylinder marking 1 nearest f lywheel
Spark plugs, Bosch type W175T35 (alt.
correspondi ng
spark plug of
other make)
Gap, mm (in.) . . 0.7 (0.028)
Early prod.
Distributor, Bosch type
80
ing, 1200 r.p.m
Cam angle
Late prod.
Distributor, Bosch type JF2O231 109 015
Basic setting 20 (before T.D.C.)
Stroboscope setting, 12OO r.p.m. 1 10
Gap, mm (in.) . . 0.4 (0.016)
Cam angle 600 a 30
Electrical system
Voltage, volts 12
Battery capacity, Ah max. (SIBA STARTER GENERATOR) 34
Battery capacity, Ah max. (BOSCH STARTER GENERATOR) 60
Battery electrolyte specif ic gravity:
Fully charged battery, 9/cm3 . .
Battery to be re-charged at g/cm3
Starter-generator, type S iba
Generatoroutput,W ,.. .,..... 60
starter motor output, h.p. 0.8
Starter-generator, type Bosch LA/Ej 90/2900
Generator output, W . . . 135 max. 9O kont
Starter motor output, h.p. 1
Basic setting
Stroboscope sett
Gap, mm (in.)
Tightening torques
Cylinder bolts, kpm (lb.ft.)
Spark plugs, kpm {lb.ft.)
Flywheel (nut), kpm (lb.ft.)
Connecting rod nuts, kpm (lb.ft.)
,/6
JF20231 109 014
30 after T-D.C.
oao
0.4 (0.016)
600 t 30
1.275*1 .285
1.230
DS418
8.3 (60)
3.8 127.51
38 12151
5.5 (40)
TRACING FAULTS IN CASE OF RUNNING INTERRUPTIONS
The fault-tracing scheme below includes only the more usual reasons for faulty
operation. With the help of the instructions given in this book it is usually possible
to trace most of the causes mentioned below. ln case of doubt always contact the
nearest Volvo Penta service workshop.
Follow the instructions in the servicing scheme - this ensures the best running
reliability.
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'6,
ur FAULT TRACING Remarks
XMaster switch not' on: battery
discharged or broken electric cable See pages 20
-21
xXFuel tank empty, fuel cock closed,
fLrel f ilter blocked See page 15
X X X Water or impurities in fuel See page 16
XXXXFaulty spark plugs See page 1 6
XBurnt breaker points, moisture in
distributor and ignition cables See page 17
XXldling speed not properly adjusted See page 1 9
XBoat abnormally loaded See page 4
XMarine growth on boat bottom See page 4
X X Propeller damaged
XBlocked cooling water intake
or cooling iackets, defective
pump impeller or thermostat See pages 1 9,
20
27