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

  TM-9-2320-272-24-2 - Page 876 of 991

4-27. 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
M939/A1
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Wire brush
MATERIALS/PARTS
Six O-rings (Appendix D, Item 443)
Four O-rings (Appendix D, Item 442)
Twelve screw-assembled lockwashers
(Appendix D, Item 590)
GAA grease (Appendix C, Item 28)
Antiseize tape (Appendix C, Item 72)
Cap and plug set (Appendix C, Item 14)
REFERENCES (TM)
TM 9-2320-272-10
TM 9-2320-272-24P
EQUIPMENT CONDITION
Surge tank removed (para. 3-61).
Engine crankcase breather draft tube removed
(para. 3-2).
Thermostat and housing removed (para. 3-65).
Fan drive clutch actuator removed (para. 3-73).
GENERAL SAFETY INSTRUCTIONS
Wear eyeshields during cleaning procedure.
NOTE
Have container ready to catch coolant.
1.
Loosen hose clamp (7) and disconnect personnel heater inlet hose (8) from water manifold shutoff
drainvalve (6).
2.
Disconnect connector (5) from water temperature sending unit (4) at water manifold (12).
3.
Disconnect ether cylinder-to-safety valve line (3) and safety valve-to-atomizer line (1) from ether
start safety valve (2).
NOTE
Clean area around water manifold to prevent dirt or debris
from entering cylinder head water ports when water manifold
is removed.
4.
Remove twelve screw-assembled lockwashers (13) and manifold (12) from cylinder heads (11).
Discard screw-assembled lockwashers (13).
5.
Remove six O-rings (9) from cylinder head water ports (10). Discard O-rings (9).
6.
Plug openings on six open cylinder head water ports (10) to prevent dirt from entering water ports (10).
1.
Remove rear water manifold section (14) and O-ring (15) from rear coupling (16). Discard O-ring (15).
2.
Remove rear coupling (16) and O-ring (17) from center water manifold section (18). Discard O-ring (17).
3.
Remove center water manifold section (18) and O-ring (19) from front coupling (20). Discard O-ring (19).
4.
Remove front coupling (20) and O-ring (21) from front water manifold section (22). Discard O-ring (21).
5.
Remove ether start safety valve (2) from rear water manifold section (14).
6.
Remove water temperature sending unit (4) and water manifold shutoff drainvalve (6) from front
water manifold section (22).
4-194


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