Flushing Cooling System; Seawater Pump Impeller Inspection - Mercury Bravo Three Operation & Maintenance Manual

CB65

Flushing Cooling System

When flushing, be certain the area around propeller is clear, and
no one is standing nearby. To avoid possible injury, remove pro-
peller.
Do not run engine above 1500 RPM when flushing. Suction
created by seawater pickup pump may collapse flushing hose,
causing engine and/or drive unit to overheat.
Watch temperature gauge on dash to ensure that engine does
not overheat.
To prevent silt and/or salt buildup in cooling system, flush with fresh-
water at specified intervals.
If flushing cooling system with boat in water, raise drive unit to TRAIL-
ER position, install flushing attachment and lower drive unit to full
down/in position.
1
Install Quicksilver flushing attachment (or equivalent) over water
intake openings in gear housing.
2
Connect hose between flushing attachment and water tap.
3
With drive unit in normal operating position, 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 and remove flushing attachment.
CB66

Seawater Pump Impeller Inspection

This maintenance should be performed by an Authorized MerCruiser
Dealer.
4
Seawater pump impeller should be inspected whenever insuffi-
cient seawater flow is suspected (if operating temperature exceeds
normal range).
! WARNING
! CAUTION
! CAUTION
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