TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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TM 9-2815-220-34 ( 2) lrutaltion. (a) Aline bushing, liner, or bushing-type bearing in casting or retaining cage. Press into place with a suitable pressing arbor. (b) Select proper drill size for installation of bearing retaining pins. Drill through bearing and into casting or retaining cage to the proper depth so that the pin will be flush with the bearing surface afr installation. Drive retaining pin through bearing and into casting or retaining cage. Cut off any portion of the pin that extends above bearing. (c) Ream or burnish bushing liner, or bushing-type bearing to size specified in ap- propriate repair standards table. (d) Clean repaired part thoroughly before assembly or installation. i. Oil Sea�. Replace all oil seals at engine repair. During field repair, replace oil seal when thin feather edge Is damaged or when seal has become hard or brittle. ( 1) Removal. Press or pry damaged oil seal from casting or adapr. ( 2) Repair. When oil seal bore in casting or adapter is bured or damaged to a point where an oil-tight seal is impossible, repair or replace cast- ing or adapter. Remove slight nicks, burs, and scratches from oil seal bore in casting or adapter with crocus cloth dipped in dry-cleaning solvent or mineral spirit.a paint thinner. (8) Irali4tion. Install new oil seal in bore of casting or adapter. 3-39. Replacement of Helical-Coll and Threaded Inserts a. General. Replace all helical-eoil and screw thread inserts which do not fit securely in the cast- ing or when casting threads have become galled or stipped. b. Replacement. Replace all unserviceable helical-coil and screw thread Inserts in the same manner as outlined in the following Instruction. For instructional purposes helical-eoil inserʦ in the cylinder assembly will be replaced. ( 1) Use a diamond-shaped punch to remove the staked, serrated-tooth type section of iert (fig. 8-142) from the thread ih cylinder casting. ( 2) Install screw thread extractor - Part No. 3-62 7751056 in insert. Remove insert by applying constant pressure while turning extracr coun- terclockwise until insert is removed. Figure 3-142. Rem!1in3 helicaloil thre .iνrt om cylinder auembly ruins rew thre exlrtor. ' NOTE The special coil screw lock inserter tools listed in special tool table 2-1 must be used when installing the self-locking thread type inserʦ. These special in· serters are further Identified by paind areas marked either with a red handle or a red stripe around the body. (8) Thread new insert (fig. 8-143) into the threaded guide of inserter Part No. MIL-T-213) by slowly turning the pilot until insert is flush with the end of the tool. Insert the pilot of the screw thread inserter Part No. MIL-T-218) into e threaded hole in cylinder, with face of the Inserter resting solidly against the casting as shown. ( 4) Slowly turn handle of pilot clockwise until no further resistance is felt. The insert will then be flush with cylinder casting. Remove inserter and break off helical-coil tang. ) ) )