ENGINE FRESH WATER COOLING SYSTEM
5.7
The engine utilizes a closed system in which a mixture of water .
and anti-freeze is circulated within the engine for cooling. This
liquid is cooled by a heat exchanger which uses sea water, in a similar
fashion to the radiator on a car, using air to cool a contained liquid.
The filler cap for the fresh water (closed) cooling system is located
on the top of the engine manifold, and looks like a radiator cap.
Use the same precautions in removing the cap from a hot engine as
are appropriate for the radiator cap on an automobile - open cap
slowly to allow steam to escape. Check the level in the manifold
frequently. If additional liquid is needed, the liquid should be anti-freeze and a
fresh water mixture.
If the fresh water system is drained, or has a substantial
leak, an air lock may develop in the fresh water cooling system,
especially on boats having the water heater option. It may be
necessary to disconnect a hose running from the engine to the water
heater and fill the hoses and exchanger inside the water heater
with coolant mixture.
In northern latitudes where freezing may occur over the winter,
be sure to test the coolant anti-freeze/water mixture for freezing
point and add anti-freeze as needed if the system is not drained
for winter lay-up.
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