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

TM 9·2815·220·" two slotted nuts (fig. 3-137) and secure nuts with locking wire. Install generator idler gear and genrshaft in the same manner. b. Install twelve crankcase protectors 108827Z (fig. 3-106). Install six piston oiler squirt nozzle assemblies and secure to crankcase with twelve slotted nuts and secure nuts with locking wire (fig. 3-136). NOTE Numbers 1 through 7 indicate main bear- ing sleeve locations beginning from the front of crankcase. c. Install upper· main thrust sleeve bearing half (fig. 3·135) marked "4-case" in main bearing bore and instalJ six upper main sleeve bearing halves in other bearing bores in accordance with respective location mal'ks. Coat bearing halves with OE30 engine oil or GAA grease. d. Exercise care when installing crankshaft as- sembly to prevent damage to the main bearing cap studs and crankshaft journals. Before installing crankshaft and connecting rod assemblies place cardboard or plastic tubes over main bearing studs for protection. If such tubes are not available, cover studs with industrial tape. NOTE The connecting rods are installed on the crankshaft iu pairs. The connecting r of each pair toward the flywheel end (rear) serves the left bank cylinders; the con- necting rod toward the front of the engine serves the right bank. e. The crankshaft and connecting rod sling 10X29: consists of a cable and two adapters. The adapter with the dowel pin hole attaches to the crankshaft flywheel flange. The other adapter at- tBChes to the torsional vibration damper mounting flange. f In order r the crankshaft to clear the crank· case when it is installed, the counterweights for connecting rod bearing journals lR and lL and 6R and 6L must be in the position shown in figure 3-131, therefore install the sling adapter on the flywheel flange dowel pin making sure the No. 1 and 6 r bearing journals are in the downward sition. Seeure the adapter  the flange with two lts used to secure the flywheel. Ins tall the other sling adapter  the tonional v\bration damפr flange and secure with two vibration damper mounting bolts. g. Using a suitable hoist install crankaht and connecting  assembly as shown i n figure 3-134. Guide the connecting rods through the cylinder mounting holes and past the connecting rod pro- tectors. h. Remove two flywheel bolts (fig. 3-132) and two vibration damפr mounting bolt. a (fig. 3-133) and 222 a91 remove crankshaft and connecting ro sling. i. Coat outer edges of beang caps, bearing halves and machined surface of the crankcase webs with engine oil to facilitate instalJation of caps. Install number 4 (center) thrust bearing cap (fig. 3-309) and bea1ing half in position on crank- case studs. Use crankcase spreading tool 8708361 to spread crankcase so bearing caps will slide over studs and into position in the crankcase. NOTE The main bearing caps and main bearing halves must be installed in their original position according to location number identification on the cap and bearing half. j. Install the remaining six bearing halves in caps and similarly install caps and bearings in crankcase. NOTE The side of each main bearing cap iden- tified as "fly end" must be in:;tallcd to- ward flywheel end or rear of engine. .. Fire 3.J09. ln�taing mai11 btnri11g WJM using crankcaae prendi11g tnol. k. Mount a dial indicator (fig. 3-310) on crankcase so indicator point contacts drive gear flange on crankshaft. Using a heavy duty screwdriver, wedge between main bearing cap and crankshaft counterweight, push crankshaft toward front end. Set indicator on zero reading ("0"). Using a heavy duty screwdriver, push crankshaft toward the rear of crankcase and check indicator end play reading. End play should be from 0.011 to 0.019 inch. When end play exceeds 0.019 inch, remove bearing caps and crankshaft. Install new main thrust bearing halves. Install bearing cap and recheck thrust bearing bore (para 3-4). Then install bearing halves and crankshaft, and recheck end play to make sure it is within limits. l. Remove crankcase spreading tool (fig. 3-309). Apply OE engine oil or GAA grease and install two plate washers and four slotted nuts (fig. 3-129) se- curing main thrust bearing cap (No. 4) to crank- case assembly. Apply OE engine oil or GAA grease ) )