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ARMY TM 9-2805-257-14 AIR FORCE TO 38G2-103-2 NAVY NAVFAC P-8-612-14E (3) Air supply.  The air cleaner, whether oil bath or dry element, cleans the air going to the carburetor. The oil bath air cleaner uses oil to remove dirt from the air. The dry element air cleaner uses a dry fiber element to remove dirt from the air. As the element gets dirty, air flow through it decreases and creates a vacuum in the air cleaner. When air flow 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 2A016-1 has no speed regulation other than the adjustment of the governor. Model 2A016-2, -3 and -4 are equipped with throttle controls 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. Model 2A016-1, -2, and -3, all use a breaker point ignition system. A set of breaker points triggers a condenser and coil to produce a high voltage electric charge. This charge is then delivered, through a shielded ignition cable, to the spark plug located 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 2A016-4 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.  Lubrication of the rocker and valve assemblies is accomplished by drawing oil vapors from the crankcase into the cylinder head assembly. A breather line connects the cylinder head with the air intake elbow, mounted between the carburetor and air cleaner assembly. On Model 2A016-1, the breather line is connected directly to the air cleaner assembly. The vacuum in the breather line is sufficient to draw oil vapors from  the  crankcase,  up  through  the  push  rod  tubes,  and  into  the  cylinder  head  assembly. 1-9/(1-10 blank)


 


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