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 TM 55-1905-219-14-6
3-153. THERMOSTAT AND HOUSING - MAINTENANCE INSTRUCTIONS.
a. The temperature of the engine coolant is automatically controlled by a thermostat located in the
housing connected to the outlet end of the water manifold and to the keel coolers.
b. At coolant temperatures below approximately 170 (76.7 ), the thermostat valves remain closed
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and block the flow of coolant to the keel coolers. During this period, all of the coolant is circulated through the
engine and is directed back to the suction side of the water pump via the by-pass tube. As the coolant
temperature rises above 170 (76.7 ), the thermostat valves start to open, restricting the by-pass system,
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and permitting a portion of the coolant to circulate through the keel coolers. When the coolant temperature
reaches approximately 185 (85 ), the thermostat valves are fully open, the by-pass system is partially
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blocked off, and most of the coolant is directed through the keel coolers.
c. A properly operating thermostat is essential for efficient operation of the engine. If the engine
operating temperature deviates from the normal range of 160to 185 (71to 85 ) remove the thermostat
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and check it.
d. The by-pass hoses and tubes of the water and exhaust manifolds help to by-pass the thermostat while
the engine is warming up.
3-2615
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