TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 436 of 1015
TM 9-2320-272-24-1
3-22. PRIMING FUEL SYSTEM (M939A2)
THIS TASK COVERS:
Priming
INITIAL SETUP:
APPLICABLE MODELS
M939A2
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
MATERIALS/PARTS
Cleaning cloth (Appendix C, Item 21)
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
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Parking brake set (TM 9-2302-272-10).
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Hood raised and secured (TM 9-2320-272-10).
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Air cleaner hose removed (para. 3-13).
GENERAL SAFETY INSTRUCTIONS
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All personnel must stand clear during engine
cranking operations.
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Use eyeshields and gloves when loosening fuel
lines.
Priming
1.
Loosen adapter (6) and vent screw (7) on fuel pump (5).
NOTE
Perform step 2 until all air is purged from fuel system.
2.
Press plunger (3) on fuel transfer pump (4) until air is purged from fuel system.
3.
Tighten vent screw (7) and adapter (6) on fuel pump (5).
4.
Start engine (TM 9-2320-272-10).
NOTE
If engine fails to start, or runs rough, perform steps 5 through 10.
5.
Loosen fuel line (2) from fuel injector (1).
6.
Place cleaning cloth around fuel line (2) and fuel injector (1).
WARNING
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All personnel must stand clear during engine cranking
operation. Failure to do so may result in injury to personnel.
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Fuel pressure is sufficient to penetrate skin. Wear hand
protection and safety goggles at all times when removing
injector tubes. Failure to do so may result in injury to
personnel.
NOTE
Assistant will help with step 7.
7.
Crank engine until all air is vented at fuel injector (1).
8.
Tighten fuel line (2) at fuel injector (1).
9.
Repeat steps 5 through 8 until all fuel injectors (1) are purged free of air.
10.
Stop engine (TM 9-2320-272-10).
3-72
EQUIPMENT CONDITION
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