TM 9-6115-730-10
200 kW TACTICAL QUIET GENERATOR SET
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THEORY OF OPERATION Continued
ENGINE COOLING SYSTEM
The engine cooling system consists of a radiator, hoses, thermostat, surge tank, expansion tank, water pump, a belt driven
fan, and cooling jackets. The water pump forces coolant through passages (cooling jackets) in the engine block and cylinder
head where the coolant absorbs heat from the engine. When the engine reaches normal operating temperature, the thermostat
opens and the heated coolant flows through the upper radiator hose assembly into the radiator. The cooling fan circulates air
through the radiator where the coolant temperature is reduced. In addition, the fan cools engine and generator set
components within the TQG housing by drawing in air from outside the housing through the baffles, circulating the air
through the housing, and forcing the air through the radiator and out through the housing exhaust vents on the roof. The
housing is designed to operate with the doors closed which ensures that the main alternator and other TQG components have
access to a good flow of cooling air from outside the generator set. A coolant temperature sensor provides automatic engine
shut down in the event that coolant temperature exceeds 230F (110C). The lower Generator Set Control (GSC) display
indicates the engine coolant temperature.
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