Distributor Cap And Rotor; Circuit Breakers And Fuses; Spark Plugs; Checking And Changing Spark Plugs - Volvo Penta 4.3OSi-B Operator's Manual

Distributor cap and rotor

Remove, inspect and clean the distributor cap and rotor.
Replace these components if worn or damaged with genuine
Volvo Penta parts. No other distributor parts require service
or replacement.
Be sure spark plug leads are replaced in the correct firing
order (see the table below).

Circuit breakers and fuses

The engine and boat's electrical system is protected against
current overload by a circuit breaker and fuses.
• If the circuit breaker trips, push its button to reset it.
• Replace any blown fuses with same amp rating. (Refer to
features pages for location of fuse box.)
Caution!
Circuit breakers or fuses that repeatedly fail indicate a
problem that requires immediate attention. See your
Volvo Penta dealer.
Caution!
If electrical connections are reversed, or connections
removed when the key switch is on or the engine is
running, the electrical system may be damaged
immediately.

Spark plugs

The following tables provide spark plug part numbers, spark
plug gap, and installation torque:
Engine model Spark plug gap
0.060 in. (1.52 mm)
4.3 OSi
0.060 in. (1.52 mm)
5.0 OSi
0.060 in. (1.52 mm)
5.7 OSi
0.060 in. (1.52 mm)
5.7 OSXi
Spark plugs
E n g i n e
model (VP part number)
4.3 OSi 3861632
5.0 OSi 3861632
3861632
5.7 OSi
5.7 OSXi 3861632
Before installing new spark plugs, always check for proper
type and gap (see the table). Incorrect spark plugs can cause
operational problems and possible internal engine damage.
Before installing a spark plug, the spark plug seat in the
cylinder head should be wiped clean. Tighten plugs to the
proper torque value (see the table above). Make sure the
spark plug terminals are fully seated on the spark plugs.
When spark plug leads are removed, be sure they are re-
placed in the correct firing order (see the table ).

Checking and changing spark plugs

1. Twist and pull only on the spark plug wire boot (pulling
2.
3. Carefully inspect the insulators and electrodes of all
Installation torque
20 ft. lb. (27 Nm)
20 ft. lb. (27 Nm)
20 ft. lb. (27 Nm)
20 ft. lb. (27 Nm)
Firing order
1-6-5-4-3-2
1-8-4-3-6-5-7-2
1-8-4-3-6-5-7-2
4. Clean ignition wires with a cloth moistened in kerosene,
1-8-4-3-6-5-7-2
5. If the wires are in good condition, clean any terminals
DANGER!
• Avoid abusive handling that could crack the spark
plug's ceramic body. Damaged spark plugs can emit
external sparks that could ignite any fuel vapors in
the engine compartment.
• Do not operate engine if spark plug boots or high-
tension leads are torn or cracked. This condition
could allow external sparks which could ignite any
fuel vapors in the engine compartment, and result
in fire or explosion.
on wire may cause separation of the core of the wire).
Remove spark plugs using a 5/8-inch spark plug socket
or a 5/8-inch box wrench. Use care to avoid cracking the
spark plug insulators.
spark plugs.
• Replace any spark plug which has a cracked or broken
insulator or which has loose electrodes.
• If the insulator is worn away around the center electrode,
or the electrodes are burned or worn, the spark plug is
worn out and should be discarded.
• Spark plugs that are in good condition, except for car-
bon or oxide deposits, should be thoroughly cleaned and
gapped.
The spark plug wires are a special resistance type. The
core is carbon-impregnated linen. This type wire is su-
perior to copper core wire in its resistance to crossfire;
however, it is more easily damaged than copper core.
For this reason, pull on the spark plug boots to remove
the spark plug wires, rather than pulling on the wire insu-
lation. If the wire is stretched, the core may be broken
with no evidence of damage on the outer insulation. If
the core is broken, it will cause misfiring. In the case of
wire damage, it is necessary to replace the complete
wire assembly since a satisfactory repair cannot be made.
and wipe dry. Bend wires to check for brittle, cracked or
loose insulation. Defective insulation will permit mis-
firing, cross-firing, or spark to ground; therefore,
defective wires must be replaced.
that are corroded and replace any that are broken or
distorted. Replace any wires with broken or deteriorated
cable nipples or spark plug boots.
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