Flushing Cooling System - Mercury Ski User Manual

CC668

Flushing Cooling System

When flushing, be certain the area around propeller is clear, and no one is standing nearby. To avoid
possible injury, remove propeller.
Do not run engine above 1500 RPM when flushing. Suction created by seawater pickup pump may col-
lapse flushing hose, causing engine to overheat.
Watch temperature gauge on dash to ensure that engine does not overheat.
If cooling system is to be flushed with boat in the water, water inlet valve (if so equipped) must be closed,
or water inlet hose must be disconnected and plugged to prevent water from flowing into boat.
If boat is in the water, do not open water inlet valve until engine is to be restarted, to prevent contami-
nated water from flowing back into engine.
To prevent silt and/or salt buildup in cooling system, flush with freshwater at specified intervals.
1
Disconnect water inlet hose from aft end of seawater pickup pump.
A
Bottom Hose is water inlet on all 350 CID and later model 454 CID engines.
B
Top Hose is water inlet on some early model 454 CID engines.
2
Models with Walter V-Drive Transmission - Disconnect water inlet hose from transmission fitting.
3
Using appropriate connector, connect hose between connector and water tap. Partially open water tap (about
1/2 maximum). Place remote control in NEUTRAL, idle speed position and start engine. Operate engine at idle
speed, in NEUTRAL, for about 10 minutes, or until discharge water is clear. Stop engine. Shut off water, remove
flushing connector from pump inlet and reconnect water inlet hose. Tighten hose clamp securely.
! WARNING
! CAUTION
! CAUTION
! CAUTION
! CAUTION
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