TM-9-2320-272-24-4
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 4 OF 4
JUNE 1998
TM-9-2320-272-24-4 - Page 138 of 836
TM 9-2320-272-24-4
5-19. FUEL INJECTOR REPAIR (Contd)
e. Top Stop Injector Assembly
1.
2.
3.
4.
5.
6.
Place new check ball (3) in injector barrel (4).
Place injector barrel (4) flat on clean lint-free cloth so mating surface faces upward.
Place adapter (2) on injector barrel (4).
Hold injector barrel (4) and adapter (2) together and set adapter (2) upright on clean lint-free cloth.
Position new injector cup (6) on top of injector barrel (4).
Screw cup retainer (5) onto adapter (2), finger tighten, and back off 1/4 turn.
CAUTION
l
Injector barrel and plunger are a matched pair (class fit). Do not
interchange.
l
Do not touch internal parts unless hands are clean and
moistened with diesel fuel. Failure to do so may result in
damage to internal parts.
7.
Apply clean diesel fuel to coat plunger (1).
8.
Insert plunger (1) into adapter (2).
9.
Remove loading fixture stud (7) from loading fixture (8) and insert injector (9) into loading fixture (8).
10.
Slide body wrench over flats on injector adapter (2).
11.
Position cup retainer wrench on cup retainer (5).
12.
Install loading fixture stud (7) in loading fixture (8) and tighten 75 lb-ft (8 N
l
m).
13.
Tighten cup retainer (5) 50 lb-ft (68 N
l
m) with torque wrench and crowfoot wrench.
CAUTION
l
Lubricate parts only with clean diesel fuel before assembly. Do
not use lubricating oil. Oil can crystallize under excessive heat,
causing damage to injector components.
l
Do not touch internal parts unless hands are clean and
moistened with diesel fuel. Failure to do so may result in
damage to internal parts.
5-132
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