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6. Clean spark plugs.
Spark plugs that have carbon or oxide deposits should
be cleaned in a blast type spark plug cleaner. Scraping
with a pointed tool will not properly remove the depos-
its and may damage the insulator. If spark plugs have a
wet or oily deposit, dip them in a decreasing solvent
and dry thoroughly with compressed air. Oily plugs will
cause the cleaning compound to pack in the shell.
Carefully follow the instructions of the manufacturer of
the cleaner being used. Clean each plug until the inte-
rior of shell and entire insulator is cleaned. Avoid ex-
cessive blasting.
7. Examine interior of plug in good light. Remove any
cleaning compound with compressed air. If traces of
carbon or oxide remain in plug, finish the cleaning with
a light blasting operation. Clean firing surfaces of cen-
ter and side electrodes with several strokes of a fine
cut file.
8. When spark plugs have been thoroughly cleaned, care-
fully inspect them for cracks or other defects that may
not have been visible before cleaning.
9. Use a round wire feeler gauge to check the gap be-
tween the spark plug electrodes. (Flat feeler gauges
will not give a correct measurement if the electrodes
are worn.) Adjust gap by bending the side electrode
only. Bending the center electrode will crack the insu-
lator. Setting the spark plug gap to any other specifica-
tion in an attempt to improve idle or affect engine per-
formance is not recommended.
10. See the diagrams for correct installation of spark plugs
and wires.
For proper engine performance it is very important that the
correct spark plugs be used. When installing spark plugs,
make sure that the threads in the cylinder head and all
surfaces on plugs and in cylinder heads are clean. Tighten
spark plugs the specified amount. All engines use tapered
seat plugs without gaskets.
DANGER!
Do not operate engine if spark plug boots or high-
tension leads are torn or cracked. This condition can
allow external sparks, which could ignite any fuel
vapors in the engine compartment.
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4.3 OSi
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Spark plug wires must be arranged between the distributor
cap and spark plugs in the order of firing sequence. If spark
plug wires are not correctly installed, misfiring or cross-firing
will result.
Belt adjustments
WARNING!
To prevent possible injury caused by someone inad-
vertently starting the engine, remove the ignition keys
from each starting location (especially if the engine
room/engine compartment cannot be seen from
various remote starting positions such as a flybridge or
enclosed cabin).
(4.3 OSi, 5.0 OSi, 5.7 OSi/OSXi)
These engine models use a serpentine belt, which is a con-
tinuous-loop belt threaded through the alternator pulley, cir-
culating pump pulley, tensioner pulley, and power steering
pump pulley. This single belt replaces three separate belts
(alternator, circulation, and power steering). At least once
per year, check the belt, or have your Volvo Penta dealer
check the serpentine belt for wear. An ideal time to have this
check performed is when you have the gimbal bearings and
universal joints lubricated.
Cooling system
Volvo Penta engines have a thermostat-controlled, raw wa-
ter, or closed cooling system.
1. Water is drawn through water intakes located on the
leading edge of the sterndrive by a raw water pump
mounted on the crankshaft of the engine.
2. Water is pumped to the engine thermostat housing where
it is routed to the circulating water pump through the
cooling system. In a closed cooling system it is routed
through the heat exchanger in a raw water system it is
circulated through the engine via the circulating water
pump.
3. A thermostat inside the engine determines the amount
of water to be taken in, recirculated, and discharged to
control the engine's operating temperatures.
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