Mercury 25 EFI FourStroke User Manual page 108

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
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