TM 9-2320-272-24-4
5-3. CYLINDER HEAD REPAIR
THIS TASK COVERS:
a. Disassembly
c. Inspection
b. Cleaning
d. Assembly
INITIAL SETUP:
PERSONNEL REQUIRED
APPLICABLE MODELS
M939/Al
TWO
REFERENCES (TM)
SPECIAL TOOLS
Head holding future (Appendix E, Item 7)
TM 9-2320-272-24P
Cleaning brush (Appendix E, Item 28)
TM 9-247
Valve guide arbor (Appendix E, Item 153)
EQUIPMENT CONDlTlON
Gauge block (Appendix E, Item 52)
Crosshead guide puller (Appendix E, Item 106)
Cylinder head removed (para. 4-12).
Crosshead guide spacer (Appendix E, Item 33)
GENERAL SAFETY INSTRUCTIONS
TOOLS
When cleaning with compressed air, wear eyeshields
General mechanic's tool kit (Appendix E, Item 1)
and ensure source pressure does not exceed 30 psi
Outside micrometer (Appendix E, Item 80)
(207 kPa).
Depth micrometer (Appendix E, Item 81)
Torque wrench (Appendix D, Item 145)
Soft-faced hammer
MATERIALS/PARTS
Six freeze plugs (Appendix D, Item 133)
Sixteen half-keepers (Appendix D, Item 253)
Two O-rings (Appendix D, Item 438)
Two screw-assembled lockwashers (Appendix D,
Item 578)
Gasket (Appendix D, Item 94)
Freeze plug (Appendix D, Item 132)
Two freeze plugs (Appendix D, Item 134)
Lubricating oil (Appendix C, Item 50)
Prussian blue (Appendix C, Item 54)
Sealing compound (Appendix C, Item 61)
Antiseize tape (Appendix C, Item 72)
Crocus cloth (Appendix C, Item 20)
a. Disassembly
Remove sixteen half-keepers (1) from valve springs (3) and cylinder head (7). Discard sixteen half-
1.
keepers (1).
NOTE
Tag springs for installation
Remove eight upper spring guides (2), valve springs (3), and lower spring guides (4) from valve
2.
guide (5) and cylinder head (7).
Tap eight valve (6) stems down lightly to loosen and remove from cylinder head (7). Place on
3.
numbered valve board and hold for inspection.
5-2
