TM-9-2320-272-24-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 2 OF 4
JUNE 1998
TM-9-2320-272-24-2 - Page 896 of 991
4-31. AIR
TM 9-2320-272-24-2
THIS TASK COVERS:
a. Removal
d. Inspection and Repair
b. Disassembly
e. Assembly
c. Cleaning
f. Installation and Timing
INITIAL SETUP:
APPLICABLE MODELS
M939/A1
SPECIAL TOOLS
Piston ring expander (Appendix E, Item 96)
Mounting plate (Appendix E, Item 85)
Engine barring tool (Appendix E, Item 43)
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Torque wrench (Appendix E, Item 146)
Depth micrometer (Appendix E, Item 81)
Outside micrometer (Appendix E, Item 80)
Inside micrometer (Appendix E, Item 82)
Dial bore gauge (Appendix E, Item 136)
Spring tester (Appendix E, Item 131)
Dial indicator gauge (Appendix E, Item 36)
Ring compressor (Appendix E, Item 32)
Telescoping gauge (Appendix E, Item 136)
Arbor press
Vise
Feeler gauge
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
EQUIPMENT CONDITION
Air reservoirs drained (TM 9-2320-272-10).
Left splash shield removed (TM 9-2320-272-10).
Fuel pump removed (para. 4-35).
Power steering pump removed (para. 3-236).
GENERAL SAFETY INSTRUCTIONS
MATERIALS/PARTS
Twelve lockwashers (Appendix D, Item 364)
Housing support gasket (Appendix D, Item 185)
Four bushings (Appendix D, Item 21)
Repair kit (Appendix D, Item 534)
Repair kit (Appendix D, Item 535)
Gasket (Appendix D, Item 186)
Two screw-assembled lockwashers (Appendix D,
Item 591)
Antiseize compound (Appendix C, Item 10)
Drycleaning solvent (Appendix C, Item 71)
Lubricating oil (Appendix C, Item 50)
Antiseize tape (Appendix C, Item 72)
Do not disconnect air lines before draining air
reservoirs.
Drycleaning solvent is flammable and toxic. Do
not use near open flame.
Keep fire extinguisher nearby when using
drycleaning solvent.
Hold down unloader valve assembly during
removal.
When cleaning with compressed air, wear
eyeshield and ensure source pressure does not
exceed 30 psi (207 kPa).
Do not disconnect air lines before draining air reservoirs. Small
parts under pressure may shoot out with high velocity, causing
injury to personnel.
1.
Disconnect coolant outlet line (1) from elbow (5) on air compressor (2) and elbow (15) on engine oil
cooler (16). Discard bushings (14).
2.
Remove elbow (5) from air compressor (2).
4-214
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