Draining Seawater Section Of Closed Cooled (Coolant) Models - Mercury 3.0L Carbureted Alpha Series User Manual

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Draining Seawater Section of Closed Cooled (Coolant) Models

If boat is in the water, seacock must remain closed until engine is to be re-started
to prevent water from flowing back into cooling system and/or boat. If boat is not
fitted with a seacock, water inlet hose must be left disconnected and plugged to pre-
vent water from flowing back into cooling system and/or boat. As a precautionary
measure, attach a tag to the ignition switch or steering wheel of the boat with the
warning: Open seacock or reconnect water inlet hose before starting engine.
1. Ensure engine is as level as possible to ensure complete draining of cooling system.
2. Remove drain plug from the following locations:
a. Aft (rear) drain plug from the heat exchanger.
b. Bottom of exhaust manifold.
3. Repeatedly clean out drain holes using a stiff piece of wire. Do this until entire system
is drained.
Page 96
a - Heat exchanger drain plug
a - Exhaust manifold drain plug
CAUTION
73581
a
a
75177
90-860168040 JANUARY 2004