TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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Figure 7-4. Measuring main bearing stud stretch using dial indicator. (b) Refer to figures 5-172 and 5-171 and install crankcase tie rods but do not torque tighten at this time. Refer to paragraph 7-6c. (c) Starting at number 4 main thrust bearing, and alternating right and left, suc- cessively torque tighten all main bearing stud nuts to 500 pound-inches, then, following the same procedure and sequence, torque tighten all nuts to a final torque of 700 to 825 pound- inches (d) Following the same procedure as (a), above, recheck stud height and apply sufficient additional torque to each nut, as in (c), above, to aline nut slot with drilled hole in stud, and to obtain a stud stretch of 0.019 to 0.022-in. Do not exceed 0.024-in. Stud stretch is defined as the difference between the original height recorded in (a) above, and height observed after nuts have been torque tightened, refer to torque specifications (para 6-7). 7-6. Accessory Drive Gear, Crankshaft Oil Seal, Transmission Adapter, and Flywheel Refer to Table 7-2 for illustrations and assembly instructions. References are listed in the table. Table 7-2. Accessory Drive Gear, Crankshaft Oil Seal, Transmission Adapter, and Flywheel Component Reference Accessory Drive Gear Crankshaft Oil Seal Housing Para 7-6a and b, Figs. 5-169, 7-5, 5-168, 7-6, 7-7, 5-167 through 5-165 Transmission Adapter, Flywheel, and Transmission Drive Para 7-6e through g, Figs. 5-182, 5-163, 7-8, 5-159, 7-9 Gearshaft Assembly a. Accessory Drive Gear. (2) Checking accessory drive gear backlash. (1) Install accessory drive gear. Refer to Check backlash between accessory drive gear figure 5-169 and alternately tighten 12 bolts to teeth and starter drive idler gear teeth as shown draw drive gear on to crankshaft flange. in figure 7-5. Backlash should be from 0.004 to Note. Always use accessory drive gear, 0.009-inch. Check backlash between accessory FSN 2815-861-3829 (part number - 10898778) drive gear teeth and generator drive idler gear in during engine assembly. This gear can be the same manner. identified by measuring the length of the gear teeth, which are approximately 1-15 / 32-inch. 7-4