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 376 of 1015

3-4. ENGINE

EQUIPMENT CONDITION

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

Hood raised and secured (TM 9-2320-272-10).

Right splash shield removed (TM 9-2320-272-10).

Coolant drained (para. 3-53).

Engine oil drained and filter removed (para. 3-5).

Alternator removed (para. 3-80).

TM 9-2320-272-24-1

THIS TASK COVERS:

a. Removal

b. Disassembly

c. Cleaning and Inspection

d. Assembly

e. Installation

INITIAL SETUP:

APPLICABLE MODELS

M939A2

TOOLS

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

Torque wrench (Appendix E, Item 144)

Soft-jawed vise

MATERIALS/PARTS

Bypass valve (Appendix D, Item 31)

Gasket (Appendix D, Item 215)

Gasket (Appendix D, Item 230)

O-ring (early model engines only)

(Appendix D, Item 476)

Washer (Appendix D, Item 716)

Antiseize tape (Appendix C, Item 72)

REFERENCES (TM)

TM 9-2320-272-10

TM 9-2320-272-24P

GENERAL SAFETY INSTRUCTIONS

Pressure regulator is under spring tension. Use care

when removing plug.

NOTE

References to early model engines refer to engines with a serial

number before 44487830 used in M939A2 series vehicles.

1.

Loosen clamp (12) and remove hose (13) from nipple (11).

NOTE

Perform step 2 on vehicles with late model engines and step 3 on

early model engines.

2.

Remove oil supply line (1), adapter (2), and O-ring (3) from oil filter head (4). Discard O-ring (3).

3.

Remove oil supply line (1) and elbow (15) from oil filter head (4).

4.

Remove eleven screws (6), clamp (5), wiring harness (7), oil filter head (4), gasket (8), oil cooler

core (9), and gasket (10) from engine block (14). Discard gaskets (8) and (10).

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