Cleaning The Flame Arrestor; Positive Crankcase Ventilation Valve (Pcv); Changing - Mercury Mercruiser Tow Sport 5.7 MPI Manual

Cleaning the Flame Arrestor

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.
1. Remove the engine cover.
2. Disconnect and remove the crankcase ventilation hose from the fitting on the flame arrestor and valve cover.
3. Remove the flame arrestor.
a
b
c
f
a - Engine cover knob
b - Engine cover
c - Nuts, flame arrestor
d - Cover mount bracket
e - Flame arrestor
f - Crankcase ventilation hose
4. Clean the flame arrestor with warm water and a mild detergent.
5. Inspect the flame arrestor for holes, cracks, or deterioration. Replace if necessary.
6. Allow the flame arrestor to air dry completely before use.
7. Clean the crankcase ventilation hose with warm water and a mild detergent. Dry with compressed air or allow to air dry
completely.
8. Inspect the crankcase ventilation hose for cracks or deterioration. Replace if necessary.
9. Install the flame arrestor and flame arrestor bracket. Torque the flame arrestor bracket nuts to specification.
Description
Flame arrestor bracket nut
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

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.
90-8M0076545 NOVEMBER 2012
eng
WARNING
!
d
e
Section 5 - Maintenance
6110
Nm lb‑in.
12 106
Page 47
lb‑ft
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