MAINTENANCE
65
Seawater Pump Impeller Inspection
Seawater Pump Impeller service should be performed by an
authorized Mercury Marine dealer.
The seawater pump impellers (three in one pump assembly)
should be inspected whenever insufficient seawater flow is
suspected. The two rear impellers supply the engine with water
and the front impeller supplies the charge air cooler (CAC). The
impellers supplying the engine should be inspected if the engine
operating temperature exceeds the normal range. The charge air
cooler impeller should be inspected if the discharge stream for the
charge air cooler is less than normal. Consult your boat owners
manual for the location of the charge air cooler discharge location.
Flushing Cooling System
!
WARNING
Avoid possible death or serious injury. Always remove the
propeller before flushing the cooling system.
!
CAUTION
Avoid engine damage from overheating. If the engine is operated
above 1500 RPM during flushing, suction created by the
seawater pickup pump may collapse the flushing water hose
causing the engine to overheat.
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