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

TM 9-2815-220-34 chine bolts. Torque machine bolts to 1000 pound- inches, and install locking wire. k. 3. Check flywheel runout as shown in figure 3-316. Runout shall not exceed 0.015-inch. Replace flywheel if runout exceeds this limit. 3-163. Starter and Generator Drive Adapt- ers, Vibration Damper, Oil Pump and Baffle a. Using� new generator drive adapter gasket, install generator drive adapter (fig. 3-116, Models AVDS-l 790-2D and A VDS-1790-2DR) and (fig. 3-115, Model AVDS-1790-2C) with drive gearshaft and bearings as a unit. Secure generator drive adapter assembly to crankcase assembly with five bolts and lockwashers and one self-locking nut and flat washer on stud behind adapter. b. Install starter driven gear and secure to start- er driven gearshaft with slotted nut (fig. 3-113) and cotter pin. Using new starter drive adapter gasket (t1, fig. 3-ll2), install starter drive adapter (3) and secure to crankcase assembly with four self-locking nuts and flat washers (2). Install two starte1· mounting bolts (1) in adapter. c. Install torsional vibr ation damper on crankshaft and position fuel pump drive coupling (fig. 3-110) and fuel pump drive coupling adapter on damper and secure the adapter and torsional vib- ration damper to the c1·ankshaft with six ddlled head bolts. To1·que bolts to 1000-pounds-inch and secm·e with locking wire. c. l. Instal l torsional vibrat ion damper on crankshaft and position spur gearshaft o n damper (fig. 3-110.1) and secure damper and gearshaft to crankshaft with six drilled head bolts. Torque bolts to 1000 pound-inches and secure with locking wire. d. Install oil pan pressure compartment baffle on crankcase and secure with six capscrews and lockwashers (fig. 3-109). e. Install oil pump assembly (with one mounting capscrew and two preformed packings in place) on crankcase assembly and tighten capscrew located behind the oil pressure relief valve as oil pump is being installed. Secure oil pump assembly with four capscrews and flat washers (5, fig. 3-108). In- stall pressure compartment baffle bracket (2) and secure to oil pan pressure compartment baffle with two self-locking nuts and bolts (4) apd to oil pump with capscrew (1). Install locking wire. f Install new preformed packing on leveling oil pump transfer tube (3, fig. 3-107) and position tube assembly behind oil pan pressure compartment baffle with the tube end installed in opening in oil pump assembly and the flange end inserted in opening in pressure compartment baffle(4). Secure tube with two-self-locking nuts and capscrews (2). Install new leveling nu mp transfer tube seal (1) on exposed end of tube. 3·226 Change 3 3-164. Pistons and Pins, Cylinder Assem- blies, Cylinder Air Deflectors, Crankshaft Damper and Oil Fiiter Housing, Oil Pan, and Sending Units . The pistons arc marked for identification as shown in figure 3-317 to aid in installing the pistons in their proper position. The piston boss is stamped with an arrow and the cylinder location (lR) to identify the cylinder from which the piston was removed and Lo assure piston will be retued to its original cylinder. The arrows on the piston pin bos- ses are pointed up, or to the exhaust outlet port. Cylinders are stamped with position markings at the intake valve side (bottom) of valve rocker arm cover flange. Markings of any piston o r cylinders must be renewed if position marks and/or arrows are not entirely legible. Replacement piston must be marked to the corresponding cylinder it is to be used with. Always keep piston pin with its respec- tive piston. NOTE When r eplacing damaged or wo pistons it is jmportant that all of the engine's pistons be of the same size (oversize) and same weight, all having identical oversize and weight code mark ing s. Refer to figure 3-182.1 and table 3-9.3 for over- size and weight code markings. b. Coat pist ons with GAA grease or engine oil and stagger lhe ur pislon ring gaps 90 degre es apart. NOTE For instructionnl purposes, the installa- tion of only one cylinde1· assembly is de- scribed. The remaining cyl inder as-  Kl PORI SIO[ OF PISIO'I I' � \ ['111 USI roRT SI OF Pl� IQ I T·ll Figure 3·317. Piston instnution position 11trka. ) )