TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download

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TM 9-2815-220-34 v Figure 9-168. P>"essing bo ea ri110 i11to ge+ctoricl/crgcM. Section VI. REPAIR OF CONNECTING ROD, CRANKSHA, AND ASSOCIATED PARTS 3-53. General This section covers the repair of the connecting rods, crankshaft, and crankshaft oil seal and re- taining plugs. Specific instructions on disassem- bly, cleaning, inspection, repair and assembly ac- company the repair operations. Repair standards of individual components follow the inspection pl"oceclures. 3-54. Disassembly a. Remove 24 connecting rod cap bolt self-locking nuts (fig. 3-169), attaching rod caps to connecting rods. Remove rod caps, bearings, and connecting rods from crankshaft. NOTE Do not use a scriber or other sharp in- strument for marking connecting rod bearing halves. After bearings are re- moved, reassemble connecting rods and caps as they are matched sets and must be kept together for inspection and assem- bly. Care must be exercised in handing of 3-82 Change 1 the connecting rods to avoid nicks and scratches which act as stress risers and can lead to premature failure. NOTE For location identification, connecting rods and caps are stamped with a location number (fig. 3-170) on the side of one of the bosses. Fw example, "lR" would identify connecting rod and cap for No. 1 cylinder on the right bank.Mark the bearings with a grease pencil or suitable marker to indi- cate their locations; for example, the con- necting rod bearing half for cylinder "lR" should be marked "IRR" and the bearing cap half for the same cylinder should be marked "lRC". If subsequent inspection indicates the bearings are reuseable, they must be reassembled in their original po- sitions. If the connecting rod or cap mark- ings are obliterated, restamp connecting rods and caps so that they can be installeq in their original positions. In addition, the ) )