Flushing System Mcm (Sterndrive) - Mercury MerCruiser MCM 454 Mag MPI Service Manual

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Flushing System MCM (Sterndrive)

If engine is operated in salty, polluted or mineral-laden water, flush cooling system (prefer-

ably after each use) to reduce corrosion and prevent the accumulation of deposits in the

system. Thoroughly flush cooling system prior to storage.

NOTE: For additional protection against freezing and rust to the exhaust manifolds and

other components, a 50-50 mixture of antifreeze and water can be run through the engine

during Power Package Layup.

BOAT OUT OF WATER

1. Install flushing attachment over water pickup holes in gear housing as shown.

2. Attach a hose between the flushing attachment and a water tap.

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 pick-

up pump may collapse flushing hose, causing engine to overheat.

Watch temperature gauge on dash to ensure that engine does not overheat.

3. Partially open water tap (approximately 1/2 maximum capacity). DO NOT use full water

4. Place remote control in neutral, idle speed position, and start engine.

5. Operate engine at idle speed in neutral for 10 minutes, or until discharge water is clear,

then stop engine.

6. Shut off water tap. Remove hose and flushing attachment.

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Flushing Attachment

SERVICE MANUAL NUMBER 23

90-861326--1 MARCH 1999

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