TM  10-3930-643-34 GENERAL  SUPPORT  ENGINE,  FUEL,  EXHAUST  AND  COOLING  MAINTENANCE.  (cent) 13-2. Cylinder Head Assembly with Valves. (Sheet 3 of 6) CLEANING/INSPECTION/ASSEMBLY Dry  cleaning  solvent  P-D-680,  used for cleaning parts, is toxic and flammable. Use only  in well ventilated areas. Wear protective goggles and gloves. Do not smoke or allow open flames or sparks in areas where cleaning solvent is used or stored. Avoid  contact with eyes, skin or clothing. If contact with eyes is made, flush with cold water and seek medical attention  immediately. If contact with skin or clothing is made, flush with cold water. If you become  dizzy  while  using  cleaning solvent, get fresh air immediately. Compressed air used for cleaning purposes will not exceed 30 psi. Use only with effective chip guarding and personal protective equipment  (goggles/shield,  gloves, etc.). 4. Clean counterbore with cleaning solvent P-D-680 and nylon brush. Dry thoroughly with compressed air. Refer to paragraph 2-8. Go to sheet 4 13-10

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