ARMY TM 9-6115-464-12AIR FORCE TO 35C2-3-445-1NAVY NAVFAC P-8-624-121-16ENGINECOOLINGSYSTEM.The engine cooling system (Figure 1–8) consists of a radiator, hoses, ther-mostat, water pump, a belt driven fan, cooling jacket and oil cooler. The water pump forces coolant through pas-sages (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 flowsthrough the upper radiator hose assembly into the radiator tubes. The cooling fan circulates air through the radia-tor where the coolant temperature is reduced. The coolant high temperature indicator is an indicator lamp witha red lens. It illuminates when the coolant temperature rises above 217± 3°F and the high coolant temperatureprotective device actuates. The coolant temperature gauge is a dial indicator type gauge which is calibrated indegrees Fahrenheit from 120 to 240. Normal operation indication is 170°F (76.7°C) to 200°F (93.3°C).Figure 1-8. Engine Cooling System1-18
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