Mercury MerCruiser 5.7 Horizon, User Manual

Page: 79 / 114

Section 5 - Maintenance
90-899883173 DECEMBER 2007 Page 71
Cleaning the Flame Arrestor
!
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.
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
d
e
f
33180
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.
Description Nm lb‑in. lb‑ft
Flame arrestor bracket nut 12 106 –
10. Connect the crankcase ventilation hose to the fitting on the flame arrestor and valve
cover.