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ARMY TM 9-2815-252-24 AIR FORCE TO 38G1-92-2 Section II.  EQUIPMENT DESCRIPTION AND DATA 1-7.  GENERAL. The diesel engine (FIGURE 1-1) is two cylinder, four cycle, fuel injected, naturally-aspirated and liquid-cooled.  The firing order is 1-2.  The number one cylinder is toward the fan end of the engine.  The serial number is found on right side of the cylinder body at number one cylinder location.  Rotation of engine is counterclockwise as viewed from flywheel. NOTE All locations referenced herein are given facing the flywheel end (rear) of the engine. 1-8.  DETAILED DESCRIPTION. 1-8.1.  Cooling System.  The cooling system consists of a radiator, water pump, cooling fan, thermostat and connecting hoses.  The fan is mounted on shaft of water pump and both are belt driven from the crankshaft pulley.  The thermostat controls  engine  temperature  and  is  installed  in  the  top  of  engine.    The  function  of  the  cooling  system  is  to  maintain  a specific operating temperature of 170° to 220°F (77°  to 1040C) for the engine. 1-8.2.  Lubrication System.  The lubrication system consists of the oil sump, a gear type oil pump, pressure relief valve, spin-on type oil filter and internal passages within the engine. 1-8.3.  Fuel System.  The function of the fuel system is to inject a metered quantity of clean atomized fuel into the engine cylinders at a precise time near the end of the compression stroke of each piston.  The fuel system consists of the fuel tank, electrically driven transfer pump, fuel filter/water separator, fuel filter, and a fuel injection pump and fuel injector for each cylinder.  The fuel tank, transfer pump and fuel filter/water separator are not mounted on engine. 1-8.4.    Electrical  System.    The  electrical  system  is  24  VDC  operation  and  consists  of  a  battery  charging  alternator, starter, externally mounted battery and other items as required.  The battery charging alternator is mounted on front of engine and is belt driven.  When the engine is operating, the battery charging alternator supplies 24 VDC to recharge the battery  and  maintain  it  at  a  full  state  of  charge.    The  starter  is  mounted  on  the  flywheel  housing  and  when  energized engages the ring gear of the flywheel to rotate the engine. 1-2


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