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

cooling fans that have bent, broken or warped blades. Replace fan when bolt holes are elongated or show evidence of wear. Inspect fan blades for erosion. Place he Fan Rotor Gage, Parl No. 12275775, on the top surface of any suspect blade with the tabs in contact wilh the trailing edge (fig. 3-262.J ). If the blade is eroded to the extent that any part of the leading edge of the blade is hidden by lhe gage, the fan must be replaced. d. Repcii1·. 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. Position cooling fan hub (17, 3-262) inside of fan (16) marked "TOP". Install sixteen TM 9-2815-220-34 machine bolts (8), flat washers (7), slotted nuts (18), and cotter pins (6) securing cooling fan hub to fan. ' " - \ � � �NG EDGE � / "'  TA265705I Fig11r(' .1·262.1. /11sprtl11g coC1ll11g [1111 blades leading edge fur cros/011. Section XVIII. REPAIR OF ENGINE SHROUDING AND ASSOCIATED PARTS 3·113. General This section covers the repai r of the engine shroud- ing and associated components. Specific instc- tions on disassembly, cleaning, inspection, and assembly accompany the repair operations. NOTE Disassembly of various shroud compo- nents other than the cooling fan housing, shroud rails, and cover plates was ac- complished during erygine disassembly. 3-114. Disassembly I a. Remove ten bolts (4, fig. 3-263) and remove two access covers (5). Remove two capscrews (4, · fig. 3-262), selr-locking nuts (14) and flat washers (12) attaching engine cooling fan housing (15) to engine cooling fan housing (J 3). Remove eight capscrews (4), Jockwashers (I) and flat washers (l 2) at tacl t ing damper end and flywheel end coating fan housings to cooling fan engine shroud (1, fig. 3-263). Remove damper end and flywheel end cooling fan housings. I b. On Model A VDS-l 790-2DR, remove five hexagon head capscrews (I, fJg. 3-263.1) and Jockwashers (2) and remove fan housing support assembly (3). Remove ten assembled washer bolts (4) and remove two access covers (5). Remove two capscrews (4, fig. 3-262), self-locking nuts (14) and flat washers (12) attaching engine cooling fan housing (15) to engine cooling fan housing ( 13). Remove eigltl capscrews (4), lockwashers (I) and flat washers (J 2) attaching damper encl and Oy- whee l end cooling fan housings to centrifugal fan housing (6, fig . 3-263. l ). Remove clamper end and flywheel encl cooling fan housings. 3-115. Cleaning Refer to paragraph 3-36. 3-116. Inspection and Repair a. Refer to parngraph 3-37 and 3-38. b. Inspect engine and transmission shroud and associated parts (fig. 3-263) and cylinder deflectors (fig. 3-264) and plates (fig. 3-265) for damaged, bent, or cracked condition. Straighten bent shrouds or plates as near original shape as possible. Replace cracked or badly broken shroud and plates. 3-117. Assembly a. Uach housing (13, fig. 3-262) to housing (15) wJth two capscrcws (4) self-locking nuts (14) and . nntwashers (12). lnst11 enne coo.ling fan housmgs (13 and 15, fig. 3-262) on cooling n engine shroud (I, fig. 3-263) and secure with eight capscrews (4, fig. 3-262) lockwashers (1 ), and flat washers (12). · a.1. Attach housing (13, fig. 3-262) to housing (15) with two capscrews (4), self-locking nuts (14) and flat washers (12). Install engine cooling fan hous- ings (13 and 15, fig. 3-262)-on centrifugal fan hous- ing (6, fig . 3-263.1) and secure with eight capscrews (4, fig. 3-262), lock washers (1), and fla washers (12). b. Install two cooling fan shroud access covers (5, fig. 3-263) on cooling fan engine shroud (1) and secure with six assembled washer bolts (4). b.1. Install two access covers (5, fig. 3-263.1) and secure with 10 assembled washer bolts (4). Install fan housing support assembly (3) and secure with four hexagon head capscrews (1) and lockwashers (2). Change 3 3-172.1