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 936 of 991
TM 9-2320-272-24-2
4-34. INJECTOR PLUNGER AND VALVE ADJUSTMENTS (TORQUE METHOD)
THIS TASK COVERS:
a. Pre-adjustment Setup
b. Injector and Valve Adjustment
INITIAL SETUP:
APPLICABLE MODELS
M939/A1
SPECIAL TOOLS
Barring tool (Appendix E, Item 8)
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Torque wrench (Appendix E, Item 144)
Torque wrench adapter (Appendix E, Item 143)
Torque wrench (Appendix E, Item 142)
Wire gauge
Feeler gauge
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
a. Pre-adjustment Setup
1.
2.
EQUIPMENT CONDITION
l
Valve crossheads adjusted (para. 4-30).
l
Rocker lever housing covers removed (para. 4-32).
l
Rocker lever housing covers removed (in-vehicle)
(para. 4-20).
l
Fuel shutoff handle pulled
(TM 9-2320-272-10)
l
Battery ground cables disconnected (para. 3-126).
GENERAL SAFETY INSTRUCTIONS
If task is being performed while engine is in vehicle,
ensure fuel shutoff handle is pulled and battery
ground cables are disconnected to prevent engine
starting.
If task is being performed while engine is in vehicle, ensure fuel
shutoff handle is pulled and battery ground cables are disconnected
to prevent engine starting. Failure to do this may result in injury
to personnel.
NOTE
l
Injector plungers are adjusted before valves are adjusted.
l
Loosening all injector rocker lever adjusting screws and
locknuts will help indicate difference between cylinders that
have been adjusted and those cylinders still needing
adjustment.
Loosen six locknuts (3) on injector rocker levers (1) and adjusting screws (2) one full turn.
Rotate engine in gearcase (4) in direction of operating rotation until timing marks 1-6 VS on
accessory drive pulley (5) align with pointer (6).
4-254
Back to Top
