TM  10-3930-638-24&P 4-2.   ENGINE   MAINTENANCE   (cont) f. Pistons and Connecting Rods (cont). STEP LOCATION ITEM ACTION REMARKS DISASSEMBLY CAUTION Use piston ring expander to remove rings to avoid damaging pis- ton  and  ring. 5 Piston (4) a. Top piston ring (5) Remove  and Use piston ring expander discard b. Second piston ring (6) Remove  and discard c. Piston ring (7) Remove  and discard d. Two retaining Remove Use needle nose pliers rings (8) e. Piston pin (9) Remove  and set  aside f.  Connecting  rod  (3) Remove  and set  aside CLEANING WARNING Dry cleaning solvent (P-D-680), used to clean parts is toxic and flammable.  Wear  protective  goggles  and  gloves  and  use  only  in  a well ventilated area. Avoid contact with skin, eyes, and clothes and don’t breathe vapors. Do not use near open flame or exces- sive heat and don’t smoke when using it. Failure to do so could cause serious injury. lf you become dizzy while using cleaning solvent, get fresh air immediately, and get medical attention. If contact with skin or clothes is made, flush with large amounts of water. If contact with eyes is made, wash eyes with water immed- iately, and obtain medical aid immediately. 4-44