Section 4 - Maintenance
90-8M0113924 eng DECEMBER 2015 Page 59
Changing the Positive Crankcase Ventilation Valve (PCV)
This engine is equipped with a positive crankcase ventilation valve (PCV). We recommend changing it every 100 hours of
operation or at least once a year, whichever occurs first.
1. Pull the PCV valve out of the intake manifold and remove the PCV valve from the hose.
a - Hose from plenum to PCV valve
b - PCV valve
2. Inspect the PCV valve and replace if necessary.
3. Install the PCV valve into the intake manifold.
4. Ensure that the PCV valve is tightly seated into the intake manifold.
We recommend the use of Mercury MerCruiser replacement parts.
Water‑Separating Fuel Filter
!
WARNING
Fuel is flammable and explosive. Ensure that the key switch is off and the lanyard is positioned so that the engine cannot
start. Do not smoke or allow sources of spark or open flame in the area while servicing. Keep the work area well ventilated
and avoid prolonged exposure to vapors. Always check for leaks before attempting to start the engine, and wipe up any
spilled fuel immediately.
!
CAUTION
Failure to release pressure from the fuel system will result in fuel spraying out, which can cause a fire or explosion. Allow the
engine to cool completely and release all fuel pressure before servicing any part of the fuel system. Always protect eyes and
skin from pressurized fuel and vapors.
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