Section 5 - Maintenance
90-864197070 JUNE 2007 Page 67
1. Remove the PCV valve from the port valve cover.
mc71925-1
a
b
a - PCV valve b - Hose
2. Disconnect the PCV valve from the hose and discard the valve.
3. Install a new PCV valve in the valve cover and reconnect the hose.
4. Ensure the PCV valve is tightly seated in the valve cover.
Changing Water Separating Fuel Filter
!
WARNING
Fuel is flammable and explosive. Ensure 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.
GEN II Models
1. Allow the engine to cool down.
NOTE: Mercury MerCruiser recommends that the engine be shut off for 12 hours prior to
filter removal.
2. Close fuel supply valve, if equipped.
3. Wrap the water separating fuel filter with a cloth to help catch any fuel spills or spray.
4. Remove and discard the water separating fuel filter and sealing ring from the mounting
bracket.
5. Coat the sealing ring on the new filter with engine oil.
Tube Ref. No. Description Where Used Part No.
Synthetic Blend MerCruiser Engine
Oil SAE25W‑40
Filter sealing ring 92‑883725K01
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