TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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Section Il. ASSEMBLY OF ENGINE FROM SUBASSEMBLIES 7-4. General This section covers the assembly of the engine from subassemblies. Components are grouped together in proper assembly order. The crank- case assembly was partially assembled during rebuild of engine components (Chapter 6). Normally the crankcase assembly will be on the overhaul stand after it has been inspected and the main bearing bosses have been checked. In case crankcase is not on stand, install on maintenance and overhaul stand - 4910-856- 4137 (fig. 6-8) and rotate stand so that oil pan flanges are up. 7-5. Starter Drive Gearshaft, Generator and Idler Gears, Piston Oiler Nozzles, and Crankshaft and Connect- ing Rod Assembly Refer to Table 7-1 for illustrations and as- sembly instructions. References are listed in the table. Table 7-1. Starter Drive Gearshaft, Generator and Idler Gears, Piston Oiler Nozzles, and Crankshaft and Connecting Rod Assembly Component Reference Starter Drive Gearshaft and Generator and Starter Idler Para 7-5a, Figs. 5-184, 5-183, 7-1, 5-181 Gears Piston Oiler Nozzles and Crankshaft and Connecting Rod Fig. 5-180, Para 7-5c, Figs. 5-179 through 5-175, 7-2, 7-3, Assembly 5-173, 7-4, 5-172, 5-171 a. Starter Drive Gearshaft and Generator and Starter Idler Gears. Refer to figures 5-184, 5- 183, and 5-181 and to the instructions given in (1) and (2), below. (1) Starter drive gearshaft bearing cage. There are two types of bearing cages being used on the engine. Early bearing cages have a flush mounting face and require the use of a sealent. Late bearing cages have a machined recess to accommodate a preformed packing. When overhauling an engine, do not attempt to use a preformed packing on a bearing cage that does not have a machined groove to accommodate the packing. (2) Generator and starter idler gears. Install generator idler gear and assembled ball bearing retaining ring toward rear of crankcase in the same manner as the starter idler gear. Note. Retaining ring securing ball bearing in starter idler gear must be toward rear of crankcase when idler gear is positioned in crank- case. 1. Install new preformed packing (A) on idler gearshaft (C). 2. Position starter idler gear (B) and a line with idler gearshaft bore in crankcase. Figure 7-1. Installing starter idler gear. 7-2