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TM  5-3895-360-13 6-3.  ENGINE  CRANKSHAFT  PISTON,  AND  CONNECTING  ROD  REPLACEMENT  (Con’t). CLEANING AND INSPECTION WARNING a. b. Dry cleaning solvent, P-D-680, Is toxic and flammable.  Always  wear  protective  goggles and gloves, and use only In a well-ventilated area.  Avoid  contact  with  skin,  eyes,  and clothes,  and  DO  NOT  breathe  vapors.  DO NOT use near open flame or excessive heat. The  solvent’s  flash  point  is  100°F-138°F (38 °C-590C). If you become dizzy while us- ing cleaning solvent, immediately get fresh air  and  medical  help.  If  solvent  contacts eyes, Immediately wash your eyes and get medical aid. Compressed air used for cleaning or drying purposes, or for clearing restrictions, should never exceed 30 psi (207 kPa). Wear protec- tive  clothing  (goggles/shield,  gloves,  etc.) and use caution to avoid injury to personnel. Clean parts with dry cleaning solvent (Item 16, Ap- pendix E) and dry with compressed air. Using honing unit, clean carbon from exhaust ports and  exhaust  passages. WARNING Carburetor  cleaning  compound  is  a  corrosive Iiquid. If splashed in eyes, it can cause blind- ness. If splashed on skin, It can cause serious burns.   Always   wear   protective   goggles   or lenses, rubber apron, and rubber gloves. if ac- cidently splashed in eyes or on skin, flush with clean, cool water. Refer to FM21-11 for first aid information and seek medical attention imme- diately. c. d. e. f. g. Soak   piston   in   carburetor   cleaning   compound (item 6, Appendix E). Using flexible carbon scraper, scrape piston head clean and rise with water. Using flexible carbon scraper and wire brush (Item 4, Appendix E), clean piston ring grooves. Inspect  piston  for  cracks,  scoring,  and  excessive wear or scorching. Replace piston if badly scored below top ring groove. NOTE Refer to Figure 6-13,  Measuring  Piston  Ring Grooves, for step f. Using feeler gage, measure piston ring grooves (20). Measurement   must   be   0.065-0.067   in.   (1.65- 1.70  mm).  Replace  piston  if  measurement  is  not within specification. Figure  6-13.  Measuring Piston Ring Grooves. Inspect  piston  pin  for  cracks,  bends,  and  breaks. Using outside caliper micrometer, measure outside diameter.   Outside   diameter   must   be   0.50000- 0.50015  in.  (12.70000-12.70381  mm).  Replace  pis- ton pin if measurement is not within specification, 6-11


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