Mercury MerCruiser MCM 454 Mag MPI Service Manual page 78

SERVICE MANUAL NUMBER 23
4. Remove drain plug from the fuel cooler.
5. On All Models Except Horizon: Remove both hoses from seawater pump.
6. On Horizon Model: Remove drain plugs from fittings on each seawater pump hose.
7. Repeatedly clean out drain holes using a stiff piece of wire. Do this until entire system
8. Crank engine over slightly with starter motor to purge any water trapped in seawater
9. After seawater section of cooling system has been drained completely, reconnect all
Index Index
90-861326--1 MARCH 1999
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a - Drain Plug
a - Seawater Inlet Hose
b - Hose To Cooler
a
a - Drain Plugs - One Is Hidden From View
is drained.
pickup pump. DO NOT allow engine to start.
hoses, reinstall heat exchanger end caps with new gaskets, and reinstall drain plugs.
a
b
a
MAINTENANCE
74130
75533
75536
Page 1B-61