Mercury HP 500 EFI Bravo XR/XZ/III, User Manual, Page: 111 / 148

107 500 EFI Bravo
MAINTENANCE
Flushing Cooling System
WARNING
To avoid possible injury when flushing remove propeller.
CAUTION
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.
NOTE: A cap is available to seal off the torpedo nose water pickups
but will not fit on the low (below torpedo)water pickups.
If flushing cooling system with boat in water, raise drive unit up, install
flushing attachment and lower drive unit to full down/in position. On
dual water inlet drives cover the low water inlets with suitable tape
(a), or a water pickup cap (b) is also available for the torpedo water
pickup.
1 Install Quicksilver flushing attachments (or equivalent) over
water intake holes and attach water hose. On dual water inlet
drives cover the low water inlets with suitable tape (a) or torpe-
do water pickup cap (b).
2 With drive unit in normal operating position, partially open water
tap (about 1/2 maximum). Place remote control in NEUTRAL,
position and start engine. Operate engine at idle speed, in NEU-
TRAL, for about 10 minutes, or until discharge water is clear. Stop
engine, shut off water and remove flushing attachment and low
water inlet tape (a) or cap (b).
Seawater Pump Impeller Inspection
Service should be performed by an Authorized MerCruiser Dealer.
3 Inspect seawater pump impeller if insufficient seawater flow oc-
curs (if operating temperature exceeds normal range).