MerCruiser 3.0 MPI Owner's Manual page 98

Section 6 - Storage
1. If draining with the boat in the water, close the seacock (if equipped) or remove and
plug the water inlet hose. If draining with the boat out of the water, place the boat on a
level surface to ensure complete draining of the system.
2. Remove the drain plug from the aft drain plug from the heat exchanger.
3. Clean out the drain hole with a stiff piece of wire until the entire system is drained.
NOTE: It may be necessary to lift or bend hoses to allow water to drain completely.
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a - Aft heat exchanger drain plug
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90-899883272 MARCH 2008