TM 9-2320-272-24-4
5-10. PISTON AND CONNECTING ROD MAINTENANCE
THIS TASK COVERS:
a. Connecting Rod Side Clearance Check
d. Cleaning and Inspection
e. A s s e m b l y
b. R e m o v a l
f. Installation
c. D i s a s s e m b l y
INITIAL SETUP:
APPLICABLE MODELS
MATERIALS/PARTS
M939/A1
Twelve bearing shells (Appendix D, Item 14)
REFERENCES (TM)
SPECIAL TOOLS
Piston ring groove gauge (Appendix E, Item 97)
TM 9-2320-272-24P
TOOLS
EQUIPMENT CONDITION
General mechanic's tool kit (Appendix E, Item 1)
Camshaft and gear removed (para. 5-9).
Torque wrench (Appendix E, Item 144)
GENERAL SAFETY INSTRUCTIONS
Telescoping gauge (Appendix E, Item 136)
Gloves must be worn when handling hot pistons.
Outside micrometer (Appendix E, Item 80)
Inside micrometer (Appendix E, Item 82)
Piston ring expander (Appendix E, Item 96)
Arbor press
Feeler gauge
Soft-faced hammer
Vise
Tape-protected tool
a. Connecting Rod Side Clearance Check
NOTE
Connecting rod should have free movement at crank journal.
Check with hand pressure first. Tap lightly with soft-faced
hammer only if necessary.
1.
Move connecting rod (1) up and down on crank journal (3) and measure clearance with feeler gauge.
Clearance should be 0.0045-0.13 in. (0.11-0.33 mm). Record clearance of all six connecting rods for
reassembly.
NOTE
If clearance is not 0.0045-0.13 in. (0.11-0.33 mm) or rod will not
move, continue with steps 2 and 3.
2.
Remove cap (2) and check for improper bearing size, dirt, or burrs.
Install cap (2) as outlined in task f.
3.
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