Ignition System
Maintenance for the ignition system is limited to plug
wire inspections and replacing the spark plugs. For
more complex repairs see the Service and
Maintenance Manual or your Volvo Penta dealer.
NOTICE! When replacing or installing spark plugs,
plug wires, or coils it is critical that the plug wires are
reinstalled from the coil to the correct spark plug
(cylinder). If the plug wires are connected to the wrong
cylinder an engine miss-fire will occur. The miss-fire
may cause engine damage. A miss-fire on a catalyst
equipped engine will also destroy the catalyst element.
This damage can be expensive and is not covered by
warranty.
Firing order
V6: 1–6–5–4–3–2
V8: 1–8–7–2–6–5–4–3
Spark Plugs
Very high quality spark plugs were installed in your
engine at the factory. Replacement spark plugs must
be of equal quality. See your dealer for the correct
spark plugs.
The ignition and fuel management systems of these
engines are finely tuned around many factors,
including the exact specification of the spark plugs.
Aftermarket plugs and plugs from other manufacturers
may differ slightly from the specifications of the factory
plugs.
NOTICE! Using non-factory plugs in your engine could
result in poor engine performance and even engine
damage.
See the Service Protocol for replacement frequency.
Plug gap is 1.025 mm (0.040 in.).
Spark plug installation torque is 21 Nm (15 lb.ft.)
Refer to the Service and Maintenance Manual for
complete replacement procedures.
P0018461
P0020978
P0018387
Maintenance
94 47712779 09-2020 © AB VOLVO PENTA
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