TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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f'iuurc -0. Checking crankshaft encl piny. and install twelve plate washel's and twenty ur slotted nuts securing main bearing caps numbers 1, 2, 3, 5, 6, and 7 lo crankcase assembly. Do not torque tighten or install locking wire at this time. Check and record the height of each stud using a flat surface plate and dial indicator as shown in figure 3-311. m. Install twelve crankcase rods through crank- case and install six plate washel' (4, fig. 3-128), twelve slotted nuts (1) and cotter pins. Position lowel' No. 7 main bearing crankcase rods (6) through crankcase from opposite (right) side of crankcase and install pl ale washet·, slo . tted nut and cotter pin. Install uppe1· crankcase rod at No. 7 main bea.-ing Lhl'ough crankcase and install plate washer, slotted nut (3), and cotter pin. Push the thirteen crankcase l'ods (2, fig. 3-127) through cl'ankcase assembly and install slotted nut on op- posite (left) side of lower Cl'ankcase l'Od (11) and in- stall slotted nuL (3) on upper crankcase rod. Install six plate washel'S and twelve slotted nuts (1) on twelve crankcase rods (2). n. Starling at numbel' main tht'llst bearing and alternating right and left, successively torque tighten all main bearing stud nuts to 600 pound- inches, then, following Lhe same procedure and sequence, torque tighten all nuts to a final torque of 700 to 825 pound-inches. o. Following the same procedure as (1) above, recheck stud height and apply sufficient additional to1·quc to each nul, to aline nut slot with drilled ole in stud, and to obtain a stud stretch of 0.019 to 0.022 in. Do not exceed 0.024 in. Stud stretch is 'IOfL 'l11 S, Pl:I CM SlUO Sf PE ICll �llOULO 11T EXi(( l'i. TM 9-2815-220-34 / Figure 3.311. Meas1o·i11g main bearing stud nt,retclt usi110 clial imlic11to1- defined as the difference between the ol'iginal height recorded in (1) above, and the height ob- served after nuts have been torque tightened, refer to torque specifications (para 3-41). Secul'c nuts with locking wire (fig. 3-129). 1f stud stretch exceeds 0.022 inch when torque tightening to 750 pound-inches, Lhe stud is defective and must be replaced. Refer to paragraph 3-38 for stud re- placement. 3-162. Accessory Drive Gear, Crankshaft Oil Seal Housing, Transmission Housing Adapter or Transmission Adapter, Flywheel Adapter, and Flywheel a. Install accessory drive gear on crankshaft and al teat ely tighten twelve bolls (fig. 3-125) to draw dr ive gear on to crankshaft flange. Secure bolts with l ocking wire. Check backlash bet ween acces- sory dve gear teeth and starter drive idler gear as I shown in figur e 3-3 I 2. b. Install oil seal housing support (fig. 3-124) on dowel pins (fig. 3-125) in crankcase and secure wilh foul' cap and Oat washers (fig. 3-124). Install new Change 3 3-223