TM 5-4310-379-14(18)Measure outside diameter of piston pin to determine the amount of wear. If wear of piston pin is greater thanspecified limits, replace piston pin.NOTEInside diameter of new connecting rod bushing is 1.5015-1.5020 in. (3.8138-3.8150 cm). Clearancebetween piston pin and connecting rod bushing is .0015-.0024 in. (.0038-.0060 cm).(19)Measure inside diameter of connecting rod bushing, and replace if the amount of wear is greater than specifiedclearance.(20)Inspect bearing shells for scoring, pitting, flaking, dipping, cracking, loss of babbit or signs of overheating.Replace bearing shells if any of these defects are present.(21)Inspect back of bearing shells for bright spots, if spots are present, replace bearing shells.NOTEBearing-to-crankshaft journal maximum clearance is .006 in. (.015 cm).(22)Using a micrometer ball attachment, measure the shell thickness, and replace bearing shell if less than minimumthickness shown in Table 5-3 or clearance exceed .006 in. (.015 cm).Table 5-3.(23)Using piston and connecting rod bushing installer, install bushings (6) and (5).(24)Using piston pin bushing reamer set and reaming fixture, ream bushing until inside diameter of 1.5025-1.5030 in.(3.8163-3.8176 cm) is achieved.(25)Using connecting rod bushing reamer set and holder, ream bushing until a inside diameter of 1.5015-1.5020 in.(3.8138-3.8150 cm) is achieved.WARNINGWear faceshield and clear immediate area of personnel when using low pressure air for maintenanceprocedures.5-77/(5-78 blank)
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