Mercury MerCruiser MCM 454 Mag MPI Service Manual page 42

SERVICE MANUAL NUMBER 23
BOAT IN WATER
1. Raise drive unit to full UP position.
2. Install flushing attachment over water pickup holes in gear housing as shown.
3. Attach a hose between the flushing attachment and a water tap.
4. Lower drive unit to full IN position.
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.
5. Partially open water tap (approximately 1/2 maximum capacity). DO NOT use full water
6. Place remote control in neutral, idle speed position, and start engine.
7. Operate engine at idle speed in neutral for 10 minutes, then stop engine.
8. Shut off water tap.
9. Raise drive unit to full UP position.
10. Remove hose and flushing attachment.
Index Index
90-861326--1 MARCH 1999
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b
a - Flushing Attachment
b - Hose
pressure.
a
CAUTION
CAUTION
MAINTENANCE
72693
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