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 TM 5-2410-237-23
FUEL SYSTEM THEORY OF OPERATION - CONTINUED
0039 00
GOVERNOR
1.
The governor controls the amount of fuel needed by the engine to maintain a desired rpm and controls the percent of
torque rise.
2.
The governor servo gives hydraulic assistance to the mechanical governor force to move the fuel rack.
3.
The dashpot helps give the governor better speed control when there are sudden speed and load changes.
FUEL RATIO CONTROL
1.
The air-fuel ratio control limits the amount of fuel to the cylinders during an increase of engine speed (acceleration) to
reduce exhaust smoke. Stem (38) moves lever (39) which will restrict the movement of the fuel rack in the FUEL ON
direction only.
2.
With the engine stopped, stem (38) is in the fully extended position. The movement of the fuel rack and lever (39) is not
restricted by stem (38). This gives maximum fuel to the engine for easier starts.
47
45
43
40
DRAIN OIL
44
FLOWING OIL
38
39
46
48
42
41
AIR-FUEL RATIO CONTROL-ENGINE STOPPED
47
45
40
INLET MAN. PRESSURE
DRAIN OIL
44
FLOWING OIL
38
39
42
41
48 46
43
AIR-FUEL RATIO CONTROL - ENGINE RUNNING
0039 00-4
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