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Engine and Radiator
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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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DRIVE TRAIN
TM 5-4210-220-12 1-14.  ENGINE COOLING SYSTEM - Continued b.  Fan and Shutters  The ambient air flow through the radiator removes heat from the coolant circulated through the core.  To maintain optimum engine operating temperature, the air flow is controlled.  The shutters and fan providing this control are automatically engaged by the multistat, (see fig. 1-23).  When the engine is started, compressed air is provided to close the shutters and to disengage the fan clutch.  With the fan not operating and no flow of ambient air through the radiator the cooling system heats up rapidly.  When the coolant reaches operating temperature the multistat shuts off air pressure to the shutter cylinder.  This causes the shutters to open.  When the flow of air through the radiator is  insufficient  to  dissipate  the  heat,  the  multistat  shuts  off  air  pressure  to  the  fan  clutch  and  it  engages.    Increased ambient air flow through the radiator thereby reduces the coolant temperature.  The system temperature is maintained within a range of 5 to 6 deg. F (2.5 deg. to 3 deg. C).  The automatic control of the fan and shutters can be manually disengaged  by  an  override  control  provided  in  the  cab.    When  operated,  air  flow  to  the  multistat  is  shut  off,  thus  the shutters are open and the fan engaged. Figure 1-23.  Radiator Fan and Shutter System 1-31

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