TM 9-2320-302-34
0041 00-9
PISTON AND CYLINDER ASSEMBLY MAINTENANCE - CONTINUED
0041 00
INSPECTION - CONTINUED
9.
Check connecting rod bolts and connecting rod cap nuts for thread damage or fretting on underside of heads. Replace
rod bolts and connecting rod cap nuts if either condition is present.
10.
Measure connecting rod bore at points A, B, and C. Average of bore readings must be within 3.594-3.595 in (91.288-
91.313m).
NOTE
•
Replace rod and main bearings whenever crankshaft is replaced or engine is rebuilt.
•
Overlay plated bearings may develop very small cracks or small isolated cavities (checking) on bearing
surface during engine operation. These are characteristics of, and are not detrimental to, this type of
bearing. Bearing should not be replaced for these minor surface imperfections.
11.
Inspect bearings for scoring, pitting, flaking, chipping, cracking, loss of overlay or signs of overheating. If any of these
conditions are present, discard bearings.
NOTE
Upper connecting rod bearing shells will normally show signs of distress before lower connecting rod bear-
ing shells. If overlay is worn to copper across connecting rod bearing shell, replace all connecting rod bear-
ing shells.
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