TM-9-2320-272-24-4
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 4 OF 4
JUNE 1998
TM-9-2320-272-24-4 - Page 164 of 836
TM 9-2320-272-24-4
5-25. CYLINDER HEAD REPAIR
THIS TASK COVERS:
a. Disassembly
b. Cleaning
c. Inspection
d. Repair
e. Assembly
INITIAL SETUP:
APPLICABLE MODELS
M939A2
TOOLS
General mechanic’s tool kit (Appendix E, Item 1)
Spring compressor (Appendix E, Item 135)
Gauge block (Appendix E, Item 52)
Spring tester (Appendix E, Item 131))
Vernier caliper (Appendix E, Item 159)
Dial indicator (Appendix E, Item 36)
Feeler gauge
Valve refacing machine
MATERIALS/PARTS
Twenty-four collets (Appendix D, Item 253)
Twelve seals (Appendix D, Item 613)
Eight expansion plugs (Appendix D, Item 105)
Expansion plug (Appendix D, Item 106)
Two expansion plugs (Appendix D, Item 107)
Antiseize tape (Appendix C, Item 72)
Lapping compound (Appendix C, Item 37)
Lubricating oil (Appendix C, Item 50)
Pigment (Appendix C, Item 54)
Sealing compound (Appendix C, Item 64)
REFERENCES (TM)
TM 9-247
TM 9-2320-272-24P
EQUIPMENT CONDITION
Cylinder head removed (para. 4-41).
GENERAL SAFETY INSTRUCTIONS
Eyeshields must be worn when removing valves.
WARNING
Valve springs are under compression. Eyeshields must be worn when
removing valves. Failure to do so may cause injury to personnel.
CAUTION
To remove intake and exhaust valves, position cylinder head on
exhaust port face. Use wooden or protective surface work bench to
prevent damage to cylinder head.
NOTE
•
Mark location and position of valves for installation.
• All intake and exhaust valves are removed the same.
1.
Using spring compressor, compress valve spring (3) and remove two collets (1) from valve (10) and
cylinder head (9). Discard collets (1).
2.
Release spring compressor and remove two spring retainers (2), valve spring (3), seal (4), and
valve (10) from cylinder head (9). Discard seal (4).
3.
Remove five expansion plugs (5) from top face of cylinder head (9). Discard expansion plugs (5).
4.
Remove expansion plug (6) from rear face of cylinder head (9). Discard expansion plug (6).
5.
Remove two expansion plugs (8) from front and rear faces of cylinder head (9). Discard expansion
plugs (8).
6.
Remove plug (7) from rear face of cylinder head (9).
5-158
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