Positive Crankcase Ventilation Valve (Pcv); Changing; Water-Separating Fuel Filter (Mpi); Water-Separating Fuel Filter - MerCruiser Sterndrive 4.3 MPI User Manual

10. Connect the crankcase ventilation hose to the fitting on the flame arrestor and valve
cover.
11. Install the engine cover.

Positive Crankcase Ventilation Valve (PCV)

CHANGING

IMPORTANT: Use only 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.
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.
Water‑Separating Fuel Filter (MPI)
Water‑Separating Fuel Filter
Avoid serious injury or death from a gasoline fire or explosion; gasoline is extremely
flammable and highly explosive under certain conditions. When servicing the fuel system
components ensure that the engine is cool, the ignition switch is in the off position, and
that the lanyard stop switch, if equipped, is in the off position. Do not smoke or allow
spark or open flame in the area. Wipe up any spilled fuel immediately. Ensure that no
fuel leaks exist before closing the engine hatch.
Avoid serious injury or death caused by fire or explosion. The fuel system is pressurized
during operation. Use care when removing the fuel filter. Fuel could spray on the hot
engine causing fire or explosion. Allow the engine to cool down and relieve fuel system
pressure before attempting to remove the fuel filter.
90-864195061 NOVEMBER 2006
a
a - PCV valve
b
mc71925-1
b - Hose
WARNING
!
WARNING
!
Section 5 - Maintenance
Page 81