Mercury 15 FourStroke Manual page 84

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Flushing Device
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.
IMPORTANT: Do not run engine above idle when flushing.
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.
MAINTENANCE
9192
78
91‑44357Q 2
Attaches to the water intakes;
provides a fresh water
connection when flushing the
cooling system or operating the
engine.
27259
27260

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