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TM 55-1905-221-14-1
4-53.
ENGINE COOLING SYSTEM.
a. Fresh Water Cooling System: This system provides cooling for the engines including the exhaust manifolds.
Water is circulated by the engine water pump through the keel-mounted heat exchanger. An expansion tank, with sight
glass, is included in each cooling system, and is mounted in the engine room. Check the water level daily as indicated in
the sight glass.
b. Raw (Sea) Water Cooling System: This system provides cooling for the mufflers and priming for the bilge
pumps. Sea water intake is at the sea chest which is in the hull adjacent to the fresh water heat exchanger. There are
separate systems for each propulsion unit. Each system includes two raw water pumps which are mounted aft on the
engines. Raw water is pumped through sea mufflers, and discharged with the exhaust. Sea water strainers (mounted in
the engine room) are connected in the intake lines between the sea chest and the pumps.
c.
The engine cooling piping is also part of the engine cooling system.
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