Mercury MerCruiser MCM 454 Mag MPI Service Manual page 46

SERVICE MANUAL NUMBER 23
3. Turn on water to highest pressure.
4. Attach flush socket to engine flush valve on exhaust elbow.
5. Allow engine to flush for 5 minutes.
6. Attach to next engine, if equipped, and repeat procedure.
7. Remove flush socket from the engine flush valve.
8. Turn off water.
9. Remove flush socket from hose.
10. Replace blue cap on flush socket.
LATER MODEL FLUSHING SYSTEM
NOTE: This system has a blue hose connecting the hose fitting to the flush valve.
NOTE: This procedure is not in production at time of printing. Illustrations can be found in
applicable owner's literature.
1. Attach water hose to the flush socket.
2. Turn on water to highest pressure.
3. Start engine and let run at idle.
4. Attach flush socket to engine flush valve.
5. Allow engine to flush for 2 minutes.
6. Shut off engine.
7. Remove flush socket from engine flush valve.
8. Attach to next engine, if equipped, and repeat procedure starting with Step 3.
9. Turn off water.
10. Remove flush socket from water hose.
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90-861326--1 MARCH 1999
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