MAINTENANCE
Page 1B-4 90-827242R20 FEBRUARY 2003
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
internal water passages.
Use a Quicksilver accessory or equivalent flushing attachment.
WARNING
To avoid possible injury when flushing, remove the propeller. Refer to Propeller
Replacement.
1. Remove propeller (refer to Propeller Replacement). Install the flushing attachment so
the rubber cups fit tightly over the cooling water intake holes.
CAUTION
Never start or run your outboard (even momentarily) without water circulating
through the cooling water intake in the gearcase to prevent damage to the water
pump (running dry) or overheating of the engine.
2. Attach a water hose to the flushing attachment. Turn on the water and adjust the flow
so water is leaking around the rubber cups to ensure the engine receives an adequate
supply of cooling water.
3. Start the engine and run it at idle speed in neutral shift position.
4. Adjust water flow if necessary so excess water continues leaking out from around the
rubber cups to ensure the engine is receiving an adequate supply of cooling water.
5. Check for a steady stream of water flowing out of the water pump indicator hole.
Continue flushing the outboard for 3 to 5 minutes, carefully monitoring water supply at
all times.
6. Stop the engine, turn off the water, and remove the flushing attachment. Reinstall the
propeller.
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