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 TM 55-1905-242-14
0003 00
PROPULSION ENGINE RAW WATER COOLING SYSTEM (continued)
Each propulsion engine has an engine-driven raw water pump. A sea water strainer assembly is located inline between the
sea chest and the raw water pump intake to prevent debris from entering the pump. The duplex design of the strainer allows
one side of the strainer to be cleaned while the other side of the strainer remains in use.
FUEL COOLER
OVERBOARD
DISCHARGE VALVE
PRIMING VALVE
SUCTION VALVE
SEA WATER STRAINER
SEA CHEST
DRAINCOCK
RAW WATER COOLING SYSTEM (TYPICAL)
After exiting the raw water pump, the water enters the fuel cooler where it cools the diesel fuel exiting the engine. From the
fuel cooler, the water is directed to a "T" fitting where it may travel either to the mufflers or to the overboard discharge valve.
The overboard discharge valve is used to control the amount and rate of raw water flow through the fuel coolers and the
mufflers. As the overboard discharge valve is opened, raw water flow through the mufflers decreases. As the overboard
discharge valve is closed, raw water flow through the mufflers increases. Raw water entering the mufflers is discharged
through the exhaust ports with the exhaust gases.
Raw water for priming the bilge pumps is taken from the raw water pump outlet prior to entering the fuel cooler. Flow of
water into the bilge pumps is controlled by the priming valve located near the raw water pump.
0003 00-4
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