Precautions - Mercury MerCruiser MCM 454 Mag MPI Service Manual

TROUBLESHOOTING

Precautions

Always disconnect battery cables from battery BEFORE working on fuel system to
prevent fire or explosion.
Be careful when cleaning flame arrestor and crankcase ventilation hose; gasoline
is extremely flammable and highly explosive under certain conditions. Be sure that
ignition key is OFF. DO NOT smoke or allow sources of spark or open flame in area
when cleaning flame arrestor and crankcase ventilation hose.
Be careful when changing fuel system components; gasoline is extremely flam-
mable and highly explosive under certain conditions. Be sure that ignition key is
OFF. DO NOT smoke or allow sources of spark or flame in the area while changing
fuel filter. Wipe up any spilled fuel immediately.
Avoid gasoline fire or explosion. Improper installation of brass fittings or plugs into
fuel pump or fuel filter base can crack casting and/or cause a fuel leak.
Apply #592 Loctite Pipe Sealant with Teflon to threads of brass fitting or plug.
DO NOT USE TEFLON TAPE.
Thread brass fitting or plug into fuel pump or fuel filter base until finger tight.
Tighten fitting or plug an additional 1-3/4 to 2-1/4 turns using a wrench. DO NOT
OVERTIGHTEN.
Install fuel line. To prevent overtightening, hold brass fitting with suitable
wrench and tighten fuel line connectors securely.
Check for fuel leaks.
Make sure no fuel leaks exist before closing engine hatch.
DO NOT operate engine without cooling water being supplied to water pickup holes
in gear housing, or water pump impeller will be damaged and subsequent overheat-
ing damage may result.
DO NOT operate engine without water being supplied to seawater pickup pump on
engine, or pump impeller may be damaged and subsequent overheating damage to
engine may result. Engine may be operated with boat out of water, if instructions
under "Running Engine with Boat Out of Water," following, are completed.
When running engine with boat out of water, be certain that area in vicinity of propel-
ler is clear and that no person is standing nearby. As a precautionary measure, it
is recommended that the propeller be removed.
Index Index
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WARNING
WARNING
WARNING
WARNING
WARNING
CAUTION
CAUTION
WARNING
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999