TM 9-2320-272-24-4
5-20. INJECTOR LEAK TEST (Contd)
b. Testing Injector Plunger and Seat
Remove plunger (2) and spring (3) from injector (4).
1.
Install injector link (1) in plunger (2) and place in injector (4).
2.
3.
Remove screen retaining ring (6) and inlet fuel screen (7) from injector (4).
4.
Align injector delivery orifice (5) with burnishing tool hole (11) on burnishing tool adapter (10).
Insert locating screw (8) in locating screw hole (9) on burnishing tool adapter (10) and tighten.
5.
NOTE
Support plate may be tilted.
6. Position injector (4) on support plate (14) and install in leakage tester.
7. Place feeler gauge between knurled knob (17) and locknut (18). Do not adjust locknut (18).
8. Install transfer line (20) and tighten in injector adapter (13) drain port.
9. Tighten T-handle clamp (15).
10. Shift retraction lever (16) from position A to position B. Ensure plunger (2) retracts.
11. Rotate plunger (2) in clockwise direction a little at a time while reading air flow meter (12).
Stop rotating plunger (2) when highest reading is obtained.
12. If air flow meter (12) reading is over 4.5, overhaul injector (4) (para. 5-19).
13. Shift retraction lever (16) from position B to position A.
14. Loosen T-handle clamp (15). This will apply 200 lbs (91 kg) load to plunger (2).
15. While observing checker (21), see if any bubbles appear during the first ten seconds of testing.
No bubbles should appear.
16. If a bubble does appear, observe the time it takes for the next one to appear. No more than
one bubble can appear every five seconds. If bubbling is too high, overhaul injector (4) (para. 5-19).
17. Remove transfer line (20) from injector adapter (13) drain port.
18. Release air pressure from pressure regulator (19).
19. Remove injector adapter (13) from leakage tester.
20. Remove locating screw (8) and transfer line (20) from burnishing tool adapter (10).
21. Remove injector (4) from burnishing tool adapter (10).
22. Place inlet fuel screen (7) over injector orifice (5), and install with retainer ring (6).
23. Remove plunger (2) and injector link (1) from injector (4).
24. Place plunger (2) and spring (3) in injector (4).
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