TM 10-3930-669-34 c. Cleaning/lnspection. WARNING • Dry-cleaning solvent (P-D-680) is TOXIC and flammable.  Wear protective goggles and gloves; use only in a well-ventilated area; avoid contact with skin, eyes, and clothes; and do not breathe vapors.  Keep away from heat or flame.  Never smoke when using solvent; the flashpoint for type I dry-cleaning solvent is 100°F (38°C) and for type II is 138°F (50°C).  Failure to do so may result in injury or death to personnel. • If personnel become dizzy while using cleaning solvent, immediately get fresh air and medical help.  If solvent contacts skin or clothes, flush with cold water.  If solvent  contacts  eyes,  immediately  flush  eyes  with  water  and  get  immediate medical attention. (1) Clean parts in dry-cleaning solvent.  Dry all parts using a clean shop rag. NOTE All measurements are according to Table 3-1. (2) Inspect  piston  (10)  for  damage  or  visible wear, including bosses. Measure diameter  of  piston  at  position  A.    Normal diameter  is  between  3.9331  in.    (99.9010 mm)   to   3.9338   in.   (99.   mm).      If   not   in range, replace piston. (3) Measure   outside   diameter   of   pin   (8)   at position  B.    Normal  diameter  is  between 1.3777  in.    (34.9940   mm)   to   1.3779   in. (35.0000 mm).  If not in range, replace pin. (4) Measure  ring  grooves  on  piston  (Table  3- 1). (5) Measure  trapezoidal  ring  (13),  taperfaced rings   (14),   and   oil   control   ring   (15)   at position C (Table 3-1).  Insert each piston ring (one at a time) into cylinder and press down  with  piston  to  a  distance  of  30  mm from    cylinder    head    contacting    surface. Measure  gap  of  piston  ring  and  compare with    gap    clearance    in    Table    3-1.        If measurement is wrong, replace ring. (6) Make    all    necessary    measurements    of piston (10) and connecting rod (9) assemblies according to Table 3-1. 3-69