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 190 of 836
TM 9-2320-272-24-4
5-28. CYLINDER LINERS AND BLOCK MAINTENANCE
THIS TASK COVERS:
a. Cylinder Liner Inspection
b. Cylinder Liner Removal
c. Engine Block Disassembly
d. Cylinder Liner and Engine Block Cleaning
and Inspection
e. Engine Block Assembly
f. Cylinder Liner Installation
INITIAL SETUP:
APPLICABLE MODELS
M939A2
REFERENCES (TM)
TM 9-2320-272-24P
SPECIAL TOOLS
EQUIPMENT CONDITION
Cylinder liner puller (Appendix E, Item 107)
• Connecting rods and pistons removed (para. 5-26).
Cylinder liner driver (Appendix E, Item 79)
• Camshaft removed (para. 5-27).
Two cylinder liner clamps (Appendix E, Item 35)
• Crankshaft removed (para. 5-29).
TOOLS
GENERAL SAFETY INSTRUCTIONS
General mechanic’s tool kit (Appendix E, Item 1)
• Keep fire extinguisher nearby when using
Inside micrometer (Appendix E, Item 83)
drycleaning solvent.
Gauge block (Appendix E, Item 52)
• Drycleaning solvent is flammable and toxic.
Torque wrench (Appendix E, Item 144)
• Eyeshields must be worn when cleaning with
Dial indicator (Appendix E, Item 36)
compressed air. Compressed air source will not
Telescoping gauge (Appendix E, Item 136)
exceed 30 psi (207 kPa).
Feeler gauge
MATERIALS/PARTS
Cylinder block kit (Appendix D, Item 93)
Cylinder liner seal (Appendix D, Item 95)
Drycleaning solvent (Appendix C, Item 71)
Rags (Appendix C, Item 58)
Crocus cloth (Appendix C, Item 20)
Detergent (Appendix C, Item 27)
Lubricating oil (Appendix C, Item 50)
Antiseize tape (Appendix C, Item 72)
Adhesive sealant (Appendix C, Item 4)
a. Cylinder Liner Inspection
CAUTION
Do not hone or deglaze cylinder liners. Honing or deglazing will
prevent oil ring from sealing properly.
NOTE
Inspect all cylinder liners to determine need for replacement.
1.
Inspect cylinder liner (1) for vertical scratches, grooves, pits, scuffing, scoring, and cracks. Tag
cylinder liner (1) for replacement if scratched, grooved, pitted, scuffed, scored, or cracked.
2.
Inspect for dirt or debris embedded in walls of cylinder liner (1). Tag cylinder liner (1) for
replacement if debris is present.
3.
Inspect walls of cylinder liner (1) for heavy polishing and wear. Heavy polishing exists when wall
has a bright mirrored finish. Tag cylinder liner (1) for replacement if heavy polishing exists.
5-184
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