8-5 8-1. GENERAL. (cont) d. Overhaul. (cont) manufactured  of  materials  not  previously proven in service and on proven parts in sufficient quantities to assure good quality control on the process being used. No flame or arc welding shall be used on rotating parts such as turbine wheels,  compressor  wheels,  shafts,  or gears. Unless  specifically  forbidden  by other  portions  of  this  manual,  the  above procedures shall be applied toward repair of all parts applicable to this engine. (f)  During both removal and disassembly procedures, check parts and components  for  wear  and  damage  before cleaning. Fine  metallic  particles present in a lubricant are evidence of wear that would be lost during cleaning operations. (g) Parts shall be inspected by experienced  personnel  using  good  shop practice. A careful visual inspection should precede any detail check to eliminate unnecessary inspection procedures and to determine the extent of further checking. Inspection requirements  in this section are provided as the basis for setting up inspection  procedures. CAUTION To prevent damage, do not use lead or wax base pencils for marking on high temperature alloy parts. Carbon/wax  in  pencils  is  detrimental to parts. Use red ink felt pens or grease base pencils. (h)  Check all micrometers, gages,  indicators,    and other measuring instruments periodically. Calibrate in accordance with MIL-STD-120 or with applicable  manufacturer  instructions. ARMY TM  5-6115-612-34 MARINE CORPS TM 6115-34/8 AIR  FORCE TO  35C2-3-471-2 NAVY AG-320BO-MME-OOO (i) Good shop practices include complete and accurate inspection records. Records not only simplify reworking of the equipment, but also ensure a complete and thorough overhaul. Inspection records should be based upon the  requirements  outlined  in  this section. Parts needing rework or replacement should be so tagged, and a notation of the disposition of these parts should be entered on the inspec- tion records. The same method should be followed for parts needing special treatment,    such as magnetic or fluo- rescent inspections, painting, cadmium plating,  and  similar  treatments. 8-2. CONBUSTION  CHAMBER  CASE  ASSEMBLY. a. Removal. NOTE See table 2-3, Fabricated Tools and Equipment, for fabricating dimen- sions  and  specifications  for  all FT-21XXX numbers referenced in the text. (1)  Remove engine, gearbox assembly, generator,  starter,  and engine support assembly as a unit, from the generator set in accordance with paragraph 2-7a. (2) Suspend engine and gearbox assembly in disassembly fixture. The disassembly fixture should have the mounting dimensions specified in table 8-2. NOTE For ease of disassembly the fixture should be able to rotate through 360°.