TM 9-2320-272-24-4
5-32. FUEL INJECTION PUMP PRETEST (Contd)
c. High-speed Fuel Delivery Test
NOTE
Maintain 21 psi (145 kPa) calibration fluid pressure throughout
this task.
1.
Set test stand (4) to measure fuel delivery at 1,000 strokes.
2.
Set fuel pump (1) to 1,050 rpm.
NOTE
If needed, increase aneroid air pressure to obtain correct rack
travel.
3.
Move control lever (3) to obtain rack travel of 0.360-0.480 in. (9.14-12.19 mm).
Take fuel draw and check fuel delivery. Correct fuel delivery is 0.891-0.928 in.3 (14.6-15.2 cm3).
4.
Allowable reading spread is 0.037 in.3 (0.6 cm3).
5.
d. Low-speed Fuel Delivery Test
NOTE
Maintain 21 psi (145 kPa) calibration fluid pressure throughout
this task.
1.
Reduce fuel pump (1) to 300 rpm.
2.
Set control rack travel between 0.308-0.316 in. (7.8-8.0 mm).
Take fuel draw and check fuel delivery. Correct fuel delivery 0.079-0.134 in.3 (1.3-2.2 cm3)
3.
Allowable reading spread is 0.030 in3 (0.5 cm3).
4.
e. Rated Speed Test
1.
Install protractor (2) on control lever (3).
2.
Position control lever (3) between 42-50
3.
Increase rpm of fuel pump (1) until control rack travel of 0.464 in. (11.78 mm) is obtained.
4.
Fuel pump (1) rpm should be between 1,090-1,100.
5.
Increase rpm of fuel pump (1) to 1,185-1,215.
6.
Check control rack travel. Correct control rack travel should be 0.016 in (0.40 mm).
7.
Position control lever (3) between 10-18.
8.
Adjust fuel pump (1) to 300 rpm.
9.
Check control rack travel. Correct control rack travel should be 0.312 in. (7.9 mm).
10.
Decrease fuel pump (1) to 100 rpm.
11.
Check control rack travel. Correct control rack travel should be 0.372 in. (9.45 mm).
12.
Increase rpm of fuel pump (1) to 300. Check control rack travel. Correct control rack travel should
be 0.308-0.316 in. (7.82-8.03 mm).
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