TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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b. Piston Oiler Nozzles. Refer to figure 5- 180. c. Crankshaft and Connecting Rod Assembly. Refer to figures 5-179 through 5-175 and to the instructions given in (1) through (3), below. (1) Main bearing caps. Coat outer edges of the bearing cap and machined surfaces of the crankcase webs with engine oil to facilitate installation of caps. 1. Install number 4 (center) thrust bearing cap (A) and bearing half in position on crankcase studs (tie rods). Use crankcase spreading tool (B)-5120-575-7767 to spread crankcase so bearing caps will slide over studs and into position in the crankcase. Note. Be sure main bearing caps and main bearing halves are installed in their original positions according to location number iden- tification on the cap and bearing half. 2. Install the remaining six bearing halves in caps (C) and similarly install caps and bearings in crankcase. Note. The side of each main bearing cap identified as “fly end” must be installed toward flywheel end or rear of engine. Figure 7-2. Installing main bearing caps using crankcase spreading tool- 5120-575-7767. Note. End play should be from 0.00740 to 0.019-inch. When end play exceeds 0.019-inch, remove bearing caps and crankshaft. Install bearing cap and recheck thrust bearing bore (para 6-9d). Then install crankshaft and recheck end play to make sure it is within limits. 1. Mount a dial indicator (A) on crankcase so indicator point contacts drive gear flange on crankshaft. 2. Using a heavy duty screwdriver, wedged between main bearing cap and crankshaft counterweight, push crankshaft toward front end (B) of crankcase. 3. Set indicator (C) on zero reading (“0”). 4. Using heavy duty screwdriver, push crankshaft toward the rear (D) of crankcase and check indicator end play reading. Figure 7-3. Checking crankshaft end play. (3) Main bearing attaching parts. (a) Refer to figure 5-173 and install all main bearing cap plate washers and nuts. Do not torque tighten nuts at this time. Check and record the height of each stud using a flat surface plate and dial indicator as shown in figure 7-4. (2) Crankshaft end play. Check crankshaft end play following the instructions which ac- company figure 7-3. 7-3