TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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6-48. Overhaul of Engine Cooling Fan and Associated Parts housing were removed during disassembly, Chapter 5. Disassemble cooling fan following instructions which accompany figure 6-225. a. Dissassembly. The cooling fan vane and Disassemble 1. Position cooling fan hub (B) inside of fan marked 1. Remove 16 cotter piss, slotted nuts (A), flat washers, “TOP”. and cap screws attaching cooling fan hub to fan. 2. Separate fan from hub (B). 2. Install 16 cap screws, flat washers, slotted nuts (A), Assemble and cotter pins securing fan to hub. Note. The machined face of the fan is marked “TOP” to insure correct assembly. Figure 6-225. Disassembling or assembling cooling fan and cooling fan hub. b. Cleaning. Refer to paragraph 6-2. c. Inspection. Inspect cooling fans using a magnifying glass under a strong light. Inspect for nicks, scratches, and cracks. A radial crack in area of a bolt hole is sufficient cause for replacement of the fan. Discard cooling fans that have bent, broken, or warped blades. Replace fan when bolt holes are elongated or show evidence of wear. Replace fan when erosion of the leading edge of the fan blade exceeds 25 or ¼ of the total blade width. 6-190 d. Repair. Repair scratches, nicks, and raised metal using a fine mill file. Note. Care must be taken when using a file, not to remove excessive amounts of metal since this will disturb the delicate balance of the fan. e. Assembly. Refer to figure 6-225. The cooling fan vane and housing will be assembled during engine assembly, Chapter 7.