TM 9-2815-237-34 f. Oil Passages. Particular attention must be given to all oil passages in castings and machined parts. Oil  passages  must  be  clean  and  free  of  any  obstructions. (1) Clean passages with wire probes to breakup any sludge or gum deposits. (2) Wash passages by flushing with solvents. See TM 9-247, (3) Dry  passages  with  compressed  air. CAUTION Do  not  allow  drycleaning  solvents  to  come  in  contact  with  seals, cables, or flexible hoses. These cleaners cause leather, rubber, and synthetic materials to dry out, rot, and lose pliability making them unserviceable. g. Nonmetallic Parts. Clean hoses and other nonmetallic parts with soap and water. h.  Bearings. WARNING Do not use compressed air to dry bearings. Spinning a dry bearing with compressed air may cause injury to personnel or damage to equipment. (1) Bearings require special cleaning. After removing surface oil and gum deposits, place bearings in hot  oil,  140°F  (60•C),  to  loosen  congealed  oil  and  grease.  Wipe  bearings  dry  with  a  Iint-free  cloth;  do  not  use compressed  air. (2) See TM 9-214 for information and care of bearings. i.   Electrical   Components. (1) Clean  electrical  components  with  clean  cloth  dampened  with  drycleaning  solvent.  Care  must  be taken  not  to  damage  protective  insulation. WARNING Compressed air used for cleaning purposes will not exceed 30 psi (207  kPa).  Use  only  with  effective  chip  guarding  and  personaI protective  equipment  (goggles/shield,  gloves,  etc.). (2) Use compressed air oa dry electrical components. 2-10.   INSPECTION a. General Instructions.  Procedures  for  inspections  will  be  the  same  for  many  parts  and  components which make up the engine subassemblies. General procedures are detailed in “b” through “k”, Dimensional standards for parts have been fixed at extremely close tolerances, so use specification tables. Use specified inspection  equipment  for  inspection  where  cracks  and  other  damage  cannot  be  spotted  visually.  Exercise extreme  care  in  all  phases  of  inspection.  Repair  or  replace  all  unserviceable  components;  refer  to  para.  2-11. b.   Castings. (1) Inspect all ferrous and nonferrous castings for cracks. See MIL-I-6866, Inspection, Penetrant Methods, and MIL-I-6868, Inspection Process, Magnetic Particles. Particularly check areas around studs, pipe plugs, threaded inserts, and sharp comers. Replace cracked castings. (2) Inspect machined surfaces for nicks, burrs, and raised metal. Mark damaged areas for repair or   replacement. (3) Inspect all pipe plugs, pipe plug openings, capscrews, and capscrew openings for damaged and stripped  threads.  Replace  if  damaged  or  threads  are  stripped. (4) Check all gasket mating surfaces, flanges on housings, and supports for warpage with a straight edge or surface plate. Inspect mating flanges for discolorations which may indicate leakage. Replace if warped. (5) Check all castings for conformance to applicable repair standards. 2-4