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 892 of 991

4-30. FUEL

TM 9-2320-272-24-2

THIS TASK COVERS:

a. Removal

b. Inspection

c. Installation and Adjustment

INITIAL SETUP:

APPLICABLE MODELS

MATERIALS/PARTS

M939/A1

SPECIAL TOOLS

Torque wrench adapter (Appendix E, Item 143)

TOOLS

General mechanic’s tool kit (Appendix E, Item 1)

Dial indicator (Appendix E, Item 36)

Torque wrench (Appendix E, Item 146)

Eight screw-assembled lockwashers (Appendix D,

Item 578)

__

Eight O-rings (Appendix D, Item 438)

Lubricating oil (Appendix C, Item 50)

REFERENCES (TM)

TM 9-2320-272-10

TM 9-2320-272-24P

EQUIPMENT CONDITION

Parking brake set (TM 9-2320-272-10).

Left and right splash shields removed

(TM 9-2320-272-10).

Rocker lever housings and push tubes removed

(para. 4-20).

NOTE

Fuel crossover connectors are mounted using screw-assembled

lockwashers on late model engines.

1.

Remove eight screw-assembled lockwashers (1), two crossover connectors (4), and eight O-rings (3)

from cylinder heads (2). Discard O-rings (3) and screw-assembled lockwashers (1).

NOTE

Tag all crossheads for installation.

2.

Loosen twelve crosshead adjusting nuts (6) on twelve valve crossheads (7).

3.

Remove twelve valve crossheads (7) from cylinder heads (2).

1.

Inspect twelve valve crossheads (7) for cracks, breaks, or scoring. Replace if cracked, broken, or

scored.

2.

Inspect adjusting screws (5) for damaged threads. Replace adjusting screws (5) if threads are

damaged.

4-210