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ARMY   TM   9-2805-262-14 AIR FORCE TO 38G2-90-1 NAVY   NAVFAC   P-8-613-14E c.  Detailed   Principles   of   Operation. (1) Fuel system.  The fuel system is composed of a fuel filter, fuel pump, fuel line, and carburetor. The fuel filter is a bowl type with a filtering screen. The screen filters dirt and other foreign materials from the fuel. The fuel pump draws fuel from an external fuel supply through the fuel filter, and delivers it to the carburetor. The fuel pump, a diaphragm type, is driven by the camshaft. The fuel pump can be operated manually, using the priming lever. This allows the fuel system, between the pump and the carburetor, to be primed before starting the engine. The carburetor mixes the air, from the air cleaner, and the fuel. This is then delivered to the combustion chamber where  it  is  compressed  and  burned. (2) Cooling system.  The flywheel fan draws cool air into the winterization shroud, where it is then directed by the cylinder head covers, baffles, and oil pan cover. The airflows around the cylinders and cylinder head assemblies  and  cools  the  engine. (3) Air supply.  The air cleaner cleans the air going to the carburetor. The air cleaner uses a dry fiber element to remove dirt from the air. As the element gets dirty, airflow through it decreases and creates a vacuum in the air cleaner. When airflow decreases too much, the service indicator shows a red signal and indicates the element  requires  cleaning. (4) Speed  regulation.  All four models of the engine are equipped with a centrifugal flyweight governor connected to the carburetor by a control rod. The governor determines the fastest speed at which the engine will run. Model 4A032-1 (serial nos. G000001 through G000500) has no speed regulation, other than the adjustment of the governor. Models 4A032-1 (serial nos. G001001 through G004004), -2, -3, and -4 are equipped with a throttle  control  which overrides the function of the governor. The throttle control allows the engine speed to be adjusted  between  idle  and  full  governed  speed. (5) Ignition  system.  There are two different types of ignition systems used on the engine. Models 4A032-1 (all) and -2 use a breaker point ignition system. A set of breaker points triggers a condenser and coil to produce a high voltage eleotric charge. This charge is then delivered, through a shielded ignition cable, to the spark plug boated in the cylinder head. This charge creates a spark at the spark plug electrode, and ignites the air/fuel mixture in the combustion chamber. Model 4A032-3, -4 uses a breakerless ignition system. This system uses electronic  components  to  generate  the  high  voltage  electric  charge  to  ignite  the  air/fuel  mixture. (6) Lubrication.  An oil pump, located behind breaker points, supplies lubricating oil to the internal components of the engine, cylinder head assemblies, and governor. The engine is equipped with a replaceable oil filter, which cleans the oil as the engine runs. 1-9/(1-10 blank)


 


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