TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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(6) Advance vane housing cover and ac- cessory drive gearshaft. Refer to figure 6-186. (a) Cut four pins 7 / 16-inch (approx.) long from 7 / 32-inch diameter brass brazing rod or other soft material. Insert the pins in the four equally spaced holes in bearing portion of ad- vance vane cover. An improvised ring com- pressing tool of the type shown in figure 2-1 can be fabricated to facilitate removal, of the advance vane cover internal retaining ring. If the im- provised tool is used, install it over the pins and tighten bolts sufficiently to compress the advance vane cover internal retaining ring. (b) Install accessory drive gearshaft in a soft-jawed vise and remove advance vane housing cover (A) using a gear puller as shown in figure 6-186. (c) Compress retaining ring and remove plug (B) from accessory drive gearshaft. Caution; Use extreme care in this operation to prevent damage to vane cover or gearshaft. b. Cleaning. Refer to paragraph 6-2. c. Inspection and Repair. Refer to paragraphs 6-3 and 6-4, and (1) through (7), below. (1) Fan drive gearshaft and fan drive bevel gearshaft. Inspect fan driven gearshaft (50.1, fig. B-26) and fan drive bevel gearshaft (5C2, fig. B-26) to limits specified in overhaul stan- dards (table 6-30). (2) Oil seal. Replace the oil seal each overhaul. (3) Clutch assembly. Refer to paragraph 6- 40c and tables 6-26 or 6-27. (4) Advance unit seals and springs. Inspect seals and springs for cracks, indentations, and wear. Check seals to the limits specified in overhaul standards (table 6-31). (5) Flyweight springs. Inspect flywheel springs for cracks and damage. Check spring tension to limits specified in overhaul standards (table 6-31). (6) Studs. Refer to paragraph 6-4e, table 6- 32, and figure 6-187 when replacing studs. 6-152