TM 9-2320-289-34
3-44.
FUEL INJECTOR PUMP TESTING AND TIMING.
This task covers:
a. Testing
b. Timing
INITIAL SETUP:
Equipment Condition
MeterialslParts
l Fuel injector pump removed (if testing fuel
• Calibration fluid (Item 13, Appendix B)
injector pump). (See paragraph 3-37)
Tools/Test Equipment
General Safety Instructions
l Torque wrench
• Use only effective chip guarding and
personnel protective equipment
(goggles/shield, gloves, etc. ) when
using compressed air.
a .
TESTING
WARNING
Use only effective chip guarding and personnel protective equipment
1 .
2.
3 .
4 .
5.
6 .
(goggles/shield, gloves, etc. ) when using compressed air, failure
follow this warning may result in serious injury to personnel.
Drain all fuel from fuel injector pump into a suitable container.
Remove protective plug from fuel inlet pipe and connect compressedair hose.
Submerge fuel injector pump in clean calibration fluid, and apply 20 psi (138 kPa) of clean,
dry, compressed air to fuel inlet pipe. Keep fuel injector pump submerged for 10 minutes to
allow any trapped air to escape.
Check for hubbies, indicating leakage, after 10 minutes. If there is no leakage, reduce air
pressure to 2 psi (14 kPa) for 30 seconds. If there still is no leakage, increase air pressure to
20 psi (138 kPa). If there still is no leakage, fuel injector pump is ready for use.
If fuel injector pump leaks at any time after 10 minutes, note location of leakage. Remove fuel
injector pump from calibration fluid. Inspect leaking area for damage or looseness of mounting
hardware. Perform appropriate maintenance task to repair leakage.
Disconnect compressed air hose from fuel inlet pipe and install plug.
b . T I M I N G
1 .
Loosen 3 nuts retaining fuel injector pump to crankcase cover. Aline scribe marks on fuel
injector pump flange and crankcase cover. Tighten nuts to 30 Ib.-ft. (41 N.m).
FOLLOW-ON TASKS:
l Install fuel injector pump if removed, (See paragraph 3-37)
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