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 856 of 991
4-23. ENGINE
TM 9-2320-272-24-2
THIS TASK COVERS:
a. Removal
d. Assembly
b. Disassembly
e. Installation
c. Cleaning and Inspection
INITIAL SETUP:
APPLICABLE MODELS
REFERENCES (TM)
M939/A1
TM 9-2320-272-10
TM 9-2320-272-24P
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
MATERIALS/PARTS
Bushing (Appendix D, Item 21)
Nine lockwashers (Appendix D, Item 354)
Gasket (Appendix D, Item 179)
Gasket (Appendix D, Item 180)
Two O-rings (Appendix D, Item 441)
Two retaining rings (Appendix D, Item 537)
Lubricating oil (Appendix C, Item 50)
Antiseize tape (Appendix C, Item 72)
Drycleaning solvent (Appendix C, Item 71)
eyeshields and ensure source pressure does not
exceed 30 psi (207 kPa).
GENERAL SAFETY INSTRUCTIONS
Keep fire extinguisher nearby when using
drycleaning solvent.
Drycleaning solvent is flammable and toxic. Do
not use near an open flame.
When cleaning with compressed air, wear
EQUIPMENT CONDITION
Parking brake set (TM 9-2320-272-10).
Right splash shield removed (TM 9-2320-272-10).
Cooling system drained (para. 3-53).
1.
Loosen hose clamp (23) and disconnect heater hose (21) from shutoff valve (24).
2.
Remove shutoff valve (24) and adapter (22) from oil cooler (17).
3.
Loosen two hose clamps (19) and disconnect surge tank-to-oil cooler hose (20) and transmission
cooler-to-oil cooler hose (18) from oil cooler (17).
4.
Disconnect air compressor coolant line (12) and bushing (11) from oil cooler elbow (1). Discard
bushing (11).
5.
Remove five screws (16), lockwashers (15), oil cooler (17), and gasket (14) from engine block (13).
Discard lockwashers (15) and gasket (14). Clean gasket remains from engine block (13) and oil
cooler (17) mating surfaces.
1.
Remove four screws (2), lockwashers (3), cooler housing (6), and gasket (9) from oil cooler end
cover (10). Discard lockwashers (3) and gasket (9), and clean gasket remains from mating surfaces
of end cover (10) and cooler housing (6).
2.
Remove pipe plug (5), elbow (1), two retaining rings (8), O-rings (7), and oil cooler element (4) from
oil cooler end cover (10). Discard retaining rings (8) and O-rings (7).
4-174
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