TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
Page 329 of 779
Note. For location identification connecting rods and caps are stamped with a location number on the side of one of the bosses. For example, “1R” would identify connecting rod and cap for No. 1 cylinder on the right bank. Bearings are also marked to indicate their locations; for example, the connecting rod bearing half for cylinder “1R” is marked “1RR” and the bearing cap half for the same cylinder is marked "1RC". If the connecting rod, cap, or bearing markings are obliterated, restamp connecting rods, caps, or bearings, so that they can be installed in their original positions. In addition, the connecting rod and cap, which are a matched assembly, are marked with iden- tifying serial numbers. These identifying serial numbers are located on the side opposite the cylinder location numbers. The rod and cap must be kept as a matched assembly, as parts are not interchangeable. b. Crankshaft Oil Seal. Remove crankshaft oil seal following instructions which accompany figure 6-32. Remove 1. Separate the retaining spring (A) from spring retaining lip of the oil seal. 2. Disengage the ends of the spring I(B) at its parting line with half turn as shown. 3. Separate seal (C) at split line and remove from the crankshaft. Discard seal and spring. Install 1. Apply a light coating of automotive and artillery grease (GAA), FSN 9150-190-0905, to new crankshaft oil seal (C). Install oil seal on crankshaft with closed, or flat, side toward flywheel flange. 2. Place a new seal spring (A) around crankshaft as shown. Turn one end of spring one half turn clockwise and the other end one half turn counterclockwise. Insert male end into female end and release spring ends. Spring ends must be properly engaged. 3. Insert the spring in the retaining groove in the oil seal. Figure 6-32. Removing or installing crankshaft oil seal. Figure 6-31. Connecting rod and bearing identification marks. 6-35