ARMY TM 9-6115-670-14&P
6-69
6.27. CONNECTING ROD BEARING.
This task covers: a. Test
b. Replace
INITIAL SETUP
Tools
General Mechanic's Tool Kit
(Item 1, Appendix B)
Equipment Conditions
Piston removed (para 6.22.).
Materials/Parts
Gage, Bearing Clearance (Plastigage)
(Item 7, Appendix F)
Connecting Rod
TEST
a. Clean connecting rod and connecting rod bearing.
b. Place a strip of Plastigage on the center of the connecting rod.
c. Install piston and connecting rod (para 6.22.).
d. Remove two bolts and remove connecting rod cap.
e. Measure oil clearance by measuring amount of Plastigage strip flattening.
f. If the oil clearance exceeds 0.0059 in. (0.15 mm), replace connecting rod bearing. Refer to
Table 6-1 and Appendix C and replace with an undersize bearing if necessary.
Table 6-1. Undersize Connecting Rod Bearing
Connecting Rod OD
Undersize Connecting Rod Bearing
1.32910 to 1.32122 in.
(33.759 to 33.775 mm)
1.32122 to 1.32185 in.
(33.559 to 33.575 mm)
0.008 in.
(0.2 mm)
0.016 in.
(0.4 mm)
CAUTION
Do not press Plastigage into the connecting rod oil hole.
