TM 5-4220-211-12&P
This position is used for cold weather starting. When rotated to the "start' position, the engine compression will be relieved
for approximately 8 crankshaft revolutions. This is done to enable the operator to manually crank the engine up to starting
speed. The release control will automatically return to "run" position from "start" position.
CAUTION
This device must never be used to stop the engine. Severe engine
damage may result from such use.
i.
Engine Starting Crank. The engine starting crank (9) engages the end of the camshaft drive. When rotated
in the proper direction, the engine crankshaft will rotate at two times the starting crank speed. This will generate adequate
"flywheel effect" to permit starting of the engine. The starting crank is used in conjunction with the automatic compression
release and, when required, the cold start primer.
j.
Engine Speed Control Lever. The engine speed control lever (10) is used to raise and lower the governed
speed of the engine and to stop the engine.
k. Compressor Prefilter and Inlet Hose. The compressor prefilter and air inlet hose (11) provides a means of
separating the air compressor from the point from which the air being compressed is actually taken. This insures that the
cleanest possible air is being compressed.
l.
Compressor Air Inlet Filter. The compressor air inlet filter (12) prevents airborne dirt and other solid
contaminants from entering and damaging the compressor's internal components.
m. Compressor Interstage Separation. The compressor interstage separation (13) is located in the
compressed air path downstream of the second to third stage intercooler. The oil and water vapor condensed from the
compressed air by the intercooler are removed from the air by a combination of centrifugal force, air baffles and a sintered
metallic filter element.
n. Compressor Final Separator. The compressor final separator (14) is located in the compressed air path
downstream of the third stage aftercooler. The oil and water vapor condensed from the compressed air are removed from
the air by the means of the air passing through two separate tubes of different lengths within final separator. This insures
that adequately precleaned air is delivered to the purification chamber.
n. Check Valve. The check valve (13, Fig. 3-1) is located downstream from the compressor final separator.
This check valve works in conjunction with the pressure maintaining valve in maintaining required pressure in the air
purification chamber during operation and when compressor is not in use.
o. Air Purification Chamber. The air purification chamber (15) is located immediately downstream of the final
separator. The precleaned air passes through a combination of chemicals intended to remove any remaining oil, water
vapor and other contaminants. This insures that the resulting air is clean, dry, and free of odor and taste. The purifier
chamber is furnished with a replaceable purification filter cartridge which is intended for regular replacement.
p. Separator/Purifier Drain Valves. The separator drain valves (16) and (23) and purifier drain valve (17) are
used to vent accumulated oil and moisture from the separators and purifier chamber. They are also used to relieve
pressure in the separators and purifier chamber for servicing and to reduce compressor starting load.
q. Compressor Pressure Maintaining Valve. The compressor pressure maintaining valve (18) is located
downstream of the purification chamber and upstream of the fill valve, hose and manifold. The function of this
Change 3 1-4
