TM 5-4310-387-14
f.
Exhaust System. The exhaust system consists of a muffler covered by a wire mesh. The muffler bolts right to
cylinder head and is designed to reduce the noise of combustion and to carry the exhaust gasses away from the engine.
g.
Lubrication System. The lubrication system provides lubrication to all moving parts within the engine. A gear
driven oil pump draws oil from the oil sump through a filter screen. The oil is then pumped through the crankshaft main
bearing, crankshaft and delivered to the connecting rod bearing.
h.
Speed Control. Speed is controlled by a speed control lever and mechanical governor. As engine speed increases
the flyweights in the governor are forced away from each other. This movement moves the governor pin outward
causing the governor lever to move the pump rack towards the idling position. When the speed control lever is moved
from the idler position, a gap is created between the throttle shaft extension screw and the governor lever. Spring action
moves the governor lever toward the full open position on the pump rack, which causes the engine to increase speed.
When equilibrium is obtained, the engine will run at that speed as determined by the position of the speed control lever.
When a load is applied to the engine, the speed decreases which brings the flyweights together. As the flyweights come
together, the governor lever moves the pump rack towards the full open position and engine speed increases. Placing
the speed control lever to the stop position, the pump rack is forced to the closed position and stops the engine.
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