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Figure 1-21.  Engine Governor and Throttle
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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Figure 1-23.  Radiator Fan and Shutter System
TM 5-4210-220-12 1-14.  ENGINE COOLING SYSTEM.  The flow through the engine cooling system is shown in figure 1-22. a.  Engine and Radiator.  The system is a rapid warm-up system with two semi-blocking thermostats.  At coolant temperatures below 180 deg. F (82 deg. C), the thermostat valves remain closed and block the main flow path to the radiator.  The engine-driven water pump circulates coolant through the oil cooler and engine and through to the radiator top tank via the deaeration line.  From the top tank the coolant is returned to the water pump via the fill line.  Thus the warm coolant is vented and circulated without heat loss in the radiator core.  When the coolant temperature increases to 180 deg. F (82 deg. C), the thermostats start to open and at the same time restrict the by-pass system.  The partially open thermostats permit a portion of the coolant to circulate through the radiator.  When the coolant temperature reaches approximately 190 deg. F (88 deg. C) the thermostats fully open, the by-pass system is completely blocked off and all of the coolant circulates through the radiator.  The engine coolant temperature is registered on temperature gages located in the cab and on the structural control panel. Figure 1-22.  Engine Cooling System 1-30

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