SERVICE MANUAL NUMBER 23
SEAWATER COOLED MODELS
Flushing Seawater Cooling System
454/502
Mag MPI and 8.2L MPI Engines (Except Horizon Model)
If engine is operated in salty, polluted or mineral-laden waters, seawater cooling system
should be flushed periodically (preferably after each use) with fresh water to reduce corro-
sion and prevent the accumulation of deposits in the system. Seawater cooling system also
should be thoroughly flushed prior to storage.
WARNING
When flushing, be certain the area around propeller is clear, and no one is standing
nearby. To avoid possible injury, remove propeller.
CAUTION
Do not run engine above 1500 RPM when flushing. Suction created by seawater
pickup pump may collapse flushing hose, causing engine to overheat.
IMPORTANT: If cooling system is to be flushed with boat in the water, seacock (if
equipped) must be closed, or water inlet hose must be disconnected and plugged to
prevent water from flowing into boat.
CAUTION
Watch temperature gauge at dash to ensure the engine does not overheat.
1.
2.
Close seacock (if equipped) or remove and plug seawater inlet hose.
Loosen hose clamp and remove seawater inlet hose at location shown. Connect tap
water hose to inlet fitting.
b
a
75533
a - Hose To Cooler
b - Seawater Inlet Hose
3.
4.
Partially open water tap (approx. 1/2 maximum capacity) and allow cooling system to
fill completely. Cooling system is full when water is discharged through the exhaust. Do
not use full tap water pressure.
Place the remote control lever in NEUTRAL position and start the engine. Operate
engine at idle speed in NEUTRAL gear for 10 minutes or until discharge water is clear,
then stop engine.
90-861326--1
MARCH 1999
Page 6A-21
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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