Mercury MerCruiser MCM 454 Mag MPI Service Manual page 72

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SERVICE MANUAL NUMBER 23

MCM (Sterndrive) Models:

1. Engine must be as level as possible to ensure complete draining of cooling system.

2. Remove end caps, sealing washers and gaskets from the heat exchanger.

IMPORTANT: Use compressed air to blow any remaining water from the tubes in the

heat exchanger.

3. Remove drain plug from bottom of port and starboard exhaust manifolds.

NOTE: With the engine level, sufficient draining of manifolds will occur when exhaust

manifold-to-thermostat housing hoses or drain plugs are removed.

NOTE: It may be necessary to lift, bend or lower hoses to allow water to drain completely

when hoses are disconnected.

90-861326--1 MARCH 1999

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Refer to "Cold Weather or Extended Storage," "Precautions," in this section,

Heat Exchanger

Sealing Washer

BEFORE proceeding.

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