Positive Crankcase Ventilation Valve (Pcv); Changing; Water-Separating Fuel Filter (Mpi); Water-Separating Fuel Filter - Mercury 350 MAG Manual

Positive Crankcase Ventilation Valve (PCV)

Changing

NOTE: We recommend the use of Mercury MerCruiser replacement parts to ensure compliance with emission regulations.
NOTE: On V6 models the PCV valve is non‑serviceable and is an internal component of the valve cover.
1. Remove the PCV valve from the port valve cover.
a
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 that the PCV valve is tightly seated in the valve cover.
Water‑Separating Fuel Filter (MPI)
Water‑Separating Fuel Filter
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.
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.

GEN II Models

Removal

1. Allow the engine to cool down.
90-8M0050539 MAY 2011
eng
a
a - Fuel filter mounting bracket
b - Sealing ring
c - Fuel filter
b
c
6527
b
mc71925-1
WARNING
!
CAUTION
!
Section 5 - Maintenance
a - PCV valve
b - Hose
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