TM 9-2320-289-343-13.PISTON, CONNECTING ROD, AND CONNECTING ROD BEARING REMOVALAND REPAIR (Con’t).b.DISASSEMBLY WARNINGAlways wear goggles when removing piston pin retainers (6). Failure tofollow this warning may result in serious injury to personnel.1.Remove 2 piston pin retainers (6).Remove piston pin (7) and separatepiston (8) from connecting rod (14),Remove 2 bolts (13) only if damaged.2.Expand upper compression ring (12)and slide from groove in piston (8).Repeat for lower compression ring(11 ), oil control ring (1 O), and oil ringIexpander (9).c.CLEANING AND INSPECTION1.2.3.4.5.Wipe oil from crankshaft journals, andupper and lower connecting rodbearing shells.Inspect connecting rod bearings forscoring or damage. Replace if scoredor damaged.Inspect connecting rod (14) for bendsor twists. Replace connecting rod andconnecting rod cap if connecting rodis bent or twisted,Measureconnectingrod journaldiameter.Diametershould be2.3970-2.3981 in.(60.875-60.913mm), Replace crankshaft if diameteris not correct. (See paragraph 3-15)Measure diameter of crankshaftjournal at several points and comparereadings.Maximum difference indiameter (out-of-round) should be0.0007 in. (0.01 77 mm). Replacecrankshaft if out-of-round.(Seeparagraph 3-1 5)TA506503 - 3 8
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