MAINTENANCE
Page 1B-4 90-857046R1 NOVEMBER 2001
15. Remove engine deposits with Power Tune Engine Cleaner.
16. Check tightness of bolts, nuts, and other fasteners.
Every 300 Hours of Use or Three Years, Whichever Occurs First
1. Replace water pump impeller (more often if overheating occurs or reduced water pres-
sure is noted).
Before Periods of Storage
1. Refer to Storage procedure (this section).
Flushing the Cooling System
Flush the internal water passages of the outboard with fresh water after each use in salt,
polluted or muddy water. This will help prevent a buildup of deposits from clogging the inter-
nal water passages.
IMPORTANT: The engine must be run during flushing in order to open the thermostat
and circulate water through the water passages.
NOTE: You can have the outboard tilted or in the vertical operating position during flushing.
WARNING
To avoid possible injury when flushing, remove the propeller. Refer to Propeller Re-
placement.
1. Place the outboard in either the operating position (vertical) or in a tilted position.
2. Remove propeller (refer to Propeller Replacement).
3. Thread a water hose into the rear fitting. Partially open the water tap (1/2 maximum).
Do not open the water tap all the way, as this allows a high pressure flow of water.
a
a-Water Hose Threaded into Rear Fitting
IMPORTANT: Do not run engine above idle when flushing.
4. Shift outboard into neutral. Start the engine and flush the cooling system for at least 5
minutes. Keep engine speed at idle.
5. Stop the engine. Turn off the water and remove hose. Reinstall the propeller.
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