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

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Figure 3-126. Remin& occesory drive gear. 3-33. Crankshaft and Connecting Rod As· sembly NOTE To avoid interference with the starter driven gearshaft, it is necessary to remove lower No. 7 main bearing engine crankcase rod from right side of crankcase. a. Remove twelve cotter pins, slotted nuts (1, fig. 8- 1;) and six plate washers from twelve engine crank- case rs (2), hold r nuts on oppite end as necessary to keep rods from turning while removing nuts. Remove cotter pins and slotted nut (8) from up- per engine ·crankcase r and remove cotter pin and slotted nut from opposite side (left) of lower r (4). Using a suitable brass rod push the 13 engine crank- case rs through crankcase assembly. 1 Slotted nut and er pin 2 Enne crankcᵫ 3 Slotted nut 4 wer ending crank  Figure 3-127. Remoui11g or irutollins ensine cron r ollochins port� - ri3h1 front uieiu. TM 9-2815-220-34 b. Remove cotter pin and slotted nut (1, fig. 3-128) and plate washer and remove upper engine crankcase r at No. 7 main bearing, from left side of crankcase assembly. Remove lower No. 7 main bearing engine crankcase r (2) slotted nut and plate washer from opposite side of crankcase and remove rod. Remove twelve cotter pins, slotted nuts (3) and six plate washers (4) from crankcase. Separate parts. 1 Slotted nut 2 Engine crankca 3 Slotted nut 4 Plate wher 5 Starter driven gearalt 6 Enne crankca r Figure 3-128. Remin& or i11Jtolling ansine cra11kc0Jc rJ and a11+chi11s part1 - leſt •ide uieto. NOTE The main bearing caps are marked 1 through 7 (front to rear) to identify their lations. Identifying numbers also appear on bearing web in crankcase assembly. The caps are not interchangeable with each other and must be returned to their original positions during installation. NOTE Do not use a scriber or other sharp in- strument for marking bearing halves. It is recommended that a grease pencil be used for marking bearing halves. c. Cut lking wire and remove 8 slotted nuts (fig. 3-129) and 12 plate washers attaching main bearing caps, numbers 1, 2, 3, 5, 6, and 7 to crankcase assem- bly. Cut lking wire and remove four slotted nuts and two plate washers attaching main thrust bearing cap (No. 4 or center) lo crankcase assembly. 3.53