TM 9-2320-272-24-4
5-37. FUEL INJECTION PUMP CALIBRATION (Contd)
l. Low Idle Fuel Delivery Test
1.
Set fuel pump (1) to 300 rpm.
2.
Position control lever (6) against idle stopscrew (5) and take a fuel draw.
3.
Observe control rack travel. Correct control rack travel should be 0.308-0.316 in. (7.80-8.03 mm).
4.
With test stand set at 1,000 strokes, take fuel draw and check delivery quantity. Correct delivery
quantity is 0.824-1.373 in.3 (13.5-22.5 cm3).
5.
If fuel delivery deviates from specifications, adjust idle stopscrew (5) until correct fuel delivery is
obtained.
m. External Stop Setting
Perform this task so control rack has a 0.039 in. (1 mm) preload.
Failure to do so may result in damage to fuel pump.
1.
Loosen adjusting nut (3) on throttle stopscrew (4).
2.
Position throttle lever (2) against throttle stopscrew (4).
3.
Adjust throttle stopscrew (4) until 0.039 in. (1 mm) preload is observed on dial indicator (7) and
tighten adjusting nut (3).
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