TM 9-2320-272-24-4
5-32. FUEL INJECTION PUMP PRETEST (Contd)
j. Fuel Breakaway Test
1.
Move control lever (3) to full load position.
2.
Gradually increase rpm of fuel pump (1) until control rack (6) moves 0.004 in. (0.1 mm) towards
shut off.
3.
Adjust fuel pump (1) to 1,090-1,100 rpm.
4.
Move control lever (3) to full load position and observe control rack travel. Correct control rack
travel should be 0.464 in. (11.79 mm).
k. Starting Fuel Delivery Test
1.
Set fuel pump (1) to 100 rpm.
2.
Set test stand (5) to measure calibration fluid at 1,000 strokes.
3.
Position throttle lever (4) to full load position and observe control rack (6) travel. Correct control
rack travel should be 0.076-0.084 in. (1.93-2.13 mm).
Check fuel delivery quantity. Correct fuel delivery quantity is 12.94-13.91 in.3 (212-227.9 cm3).
4.
l. Low Idle Fuel Delivery Test
1.
Set fuel pump (1) to 300 rpm.
2.
Position control lever (3) against low idle stopscrew (2) and take a fuel draw.
3.
Observe control rack travel. Correct control rack travel is 0.308-0.316 in. (7.82-8.03 mm).
4.
With test stand (5) set at 1,000 strokes, check fuel delivery quantity. Correct fuel delivery quantity
should be 0.824-1.373 in.3 (13.5-22.5 cm3).
Check fuel spread. Correct fuel spread should be 0.305 in.3 (4.90 cm3).
5.
5-222
