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 TM 55-1905-223-24-5
FIGURE 1-6. Coolant Flow Path.
(2) Water Filter. A water filter (corrosion resistor) bypasses a small amount of coolant from the system
through a filtering and treating element which must be replaced periodically.
(3) Cooling System Venting. The cooling system must be designed to allow air to escape while filling
the cooling system. During engine operation, coolant will continuously flow through the engine vent line to
remove air. The cooling system vent line on traditional engines is plumbed from a one-eighth inch pipe trapped
hole in the front water manifold to the heat exchanger tank above the coolant level.
(4) Coolant Cooling. The engine coolant is cooled in a heat exchanger. Sea water is circulated through
the heat exchanger outlet connections.
(5) Coolant. Use ethylene glycol antifreeze year-round to provide freeze point and boil-over protection
and always use good quality soft water in the cooling system. Refer to Army Technical Bulletin TB 55-1905-
207-24, Treatment of Cooling Water, for antifreeze and additive requirements.
(a) Antifreeze. Too much antifreeze reduces freeze protection. Do not use more than 68
percent antifreeze or overheating may result. A mixture of 50 percent water and 50 percent antifreeze is
sufficient for freeze protection to -34 (-37 ).
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