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TM 10-4320-343-14 1.14.2.5  Engine Assembly.  The engine assembly (Figure 1-7) provides the drive for the 350 GPM pumping assembly. When  the  engine  is  started,  starter  motor  B1  turns  the  crankshaft.    When  the  crankshaft  is  turned,  the  pistons    ,  and valves move up and down.  While one of the pistons is moving upward, fuel is injected into the combustion chamber and mixed  with  air  at  a  controlled  rate.    The  temperature  inside  the  combustion  chamber  causes  the  fuel  and  air  to  burn (combustion).  This combustion forces the piston downward, which causes the crankshaft to rotate and the engine to start. The starter motor B1 is then disengaged.  The up and down movement of the pistons continues with fuel being injected into selected cylinders.  The rotation of the crankshaft also turns the camshaft and timing gears.  The timing gears turn the oil  pump  and  the  fuel  pump.    Oil  is  pumped  through  the  lubrication  system  and  fuel  is  pumped  to  the  fuel  injectors.    In addition, the drive pulley rotates and drives the V-belts.  The V-belts operate the cooling fan and alternator.  The cooling fan  keeps  the  oil  and  engine  cool  to  prevent  overheating.    The  alternator  provides  14  V  dc.    The  following  paragraphs provide a more detailed description of diesel engine operation. 1.14.2.5.1    Engine  Operation  Overview.  The 350 GPM pumping assembly uses a four-stroke diesel engine with three cylinders.    The  complete  cycle  for  a  four-stroke  engine  occurs  in  four  events  for  each  piston.    Two  revolutions  of  the crankshaft are required to complete one cycle.  The four events are as follows: Intake stroke Compression stroke Power stroke Exhaust stroke When  the  intake  stroke  begins,  the  piston  is  pulled  down  into  the  cylinder  by  the  crankshaft  and  connecting  rod.    When the piston is at the lowest point possible, it is at bottom dead center (BDC).  During this time the intake valve is held open by the camshaft.  Since the piston has moved down in the cylinder to BDC, a vacuum is created and air is forced past the intake valve into the cylinder's combustion chamber. Change 1  1-16

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