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 128 of 836
TM 9-2320-272-24-4
5-19. FUEL INJECTOR REPAIR
THIS TASK COVERS:
a. Non-Top Stop Injector Disassembly
b. Top Stop Injector Disassembly
c. Inspection
d. Non-Top Stop Injector Assembly
e. Top Stop Injector Assembly
INITIAL SETUP:
APPLICABLE MODELS
M939/A1
SPECIAL TOOLS
Cup retainer wrench (Appendix E, Item 162)
Crowfoot injector wrench-(Appendix E,
REFERENCES (TM)
Item 164)
TM 9-2320-272-24P
Adjusting wrench (Appendix E, Item 3)
Locknut wrench (Appendix E, Item 165)
Injector body wrench (Appendix E, Item 70)
EQUIPMENT CONDITION
Fuel injectors removed (para. 4-32).
TOOLS
GENERAL SAFETY INSTRUCTIONS
l
Keep fire extinguisher nearby when using
drycleaning solvent.
MATERIALS/PARTS
Injector overhaul kit (Appendix D, Item 255)
Diesel fuel (Appendix C, Item 42)
Drycleaning solvent (Appendix C, Item 71)
General mechanic’s tool kit (Appendix E, Item 1)
Torque wrench (Appendix E, Item 144)
Magnifying glass
l
Drycleaning solvent is flammable and toxic. Do
not use near an open flame.
a. Non-Top Stop Injector Disassembly
1.
Remove injector link (1) from injector (8). Set injector link (1) aside to prevent damage.
WARNING
Drycleaning solvent is flammable and toxic. Do not use near open
flame and always have a fire extinguisher nearby when solvents
are used. Use only in well-ventilated places, wear protective
clothing, and dispose of cleaning rags in approved container.
Failure to do this may result in injury or death to personnel and/or
damage to equipment.
CAUTION
Improper cleaning methods and use of unauthorized cleaning
solvents can damage equipment.
2.
Clean exterior of injector (8) with drycleaning solvent (para. 2-14).
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.
3.
Remove plunger (2) and spring (3) from injector (8). Store plunger (2) by standing on end.
4.
Remove small O-ring (4) and two large O-rings (5) from injector (8). Discard O-rings (4) and (5).
5.
Remove screen retaining ring (6) and screen (7) from injector (8). Discard retaining ring (6) and
screen (7).
5-122
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