MerCruiser 8.1 H.O., User Manual

Page: 76 / 106

Section 5 - Maintenance
Page 68 90-899883273 MARCH 2008
3. Clean the flame arrestor with solvent and dry with compressed air or set aside and
allow to air dry completely.
4. Install the flame arrestor and tighten the clamp.
5. Install the engine cover.
Cleaning the IAC Muffler (Non‑DTS Models Only)
!
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. Locate the idle air control valve (IAC) on the rear of the engine.
2. Remove the IAC muffler from the slot in the air valve plate using needle‑nosed pliers.
a
b
c
32564
a
a - IAC
b - Air valve plate
c - IAC muffler location
3. Inspect the muffler for holes, cracks, or deterioration. Replace if damaged.
IMPORTANT: Do not use cleaner containing methyl ethyl ketone and do not get cleaner
on electrical connections.
4. If possible, clean the muffler until white using warm water and mild detergent. Replace
if necessary.
5. Allow the IAC muffler to completely air dry before use.
6. Install the IAC muffler.