TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
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TM 9-2815-220-24 STANDARD MAINTENANCE INSTRUCTIONS 0028 00 REPAIR (Continued) Studs Stud Identification: Stud Identification data appears in the procedural work package for the specific part. The data includes relevant information regarding setting heights, number required, identification and location. 1. Replace all bent or loose studs or studs showing evidence of stretching. Repair minor damage with a thread chaser or thread die and tap set (item 120, WP 0176). 2. Replace all studs having stripped or damaged threads. a. Using a stud remover (item 115, WP 0176), back stud out slowly to avoid heating and possible seizure. b. When studs are broken off too short to use extractor, drill stud and extract with a suitable remover such as Easy Out or similar tool from tool crib. c. Short studs may also be removed by welding a piece of bar stock or a nut to stud and removing with a wrench. 3. Repair minor thread damage in tapped holes with a thread chaser or thread die and tap set (item 120, WP 0176). NOTE When the threads on each end of a stud are of a different pitch (number of threads per inch), the coarse threaded end must enter the aluminum casting. When threads are stripped or damaged or when stud is removed from an aluminum casting for loose fit, always replace stud with next larger oversize, or in cases of complete thread pullout, drill out threaded holes, tap hole for thread insert, install insert and standard stud for repair. Markings and color code indicates whether a stud is standard or oversize. Check marking and color and refer to the following guide to be sure replacement is the proper size. Studs available for replacement (as shown in guide) are marked on the coarse thread end of the stud. WP 0028 00-18