TM  10-3930-638-24&P 3-6.   FUEL   SYSTEM   MAINTENANCE   (cont) c. Fuel Injection Pump (cont). STEP LOCATION ITEM ACTION REMARKS 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 excessive heat and don’t smoke when using it. Failure to do so could cause serious injury. If 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  immediately,  and  obtain  medical  aid  immediately. 3 Exterior of injection Clean Wipe  using  cloth  moistened  with  cleaning pump  (3) solvent P-D-680 WARNING Wear safety glasses when drying parts with compressed air. Failure to do so could cause serious injury to eyes and possible blindness. If you hurt your eyes or if a foreign object is blown into  your  eyes,  seek  medical  attention  immediately. 4 All other parts Clean Use cleaning solvent P-D-680. Dry thoroughly  with  moisture  free compressed  air INSPECTION 5 Drive shaft (15) Inspect Replace  if  bent,  pitted,  distorted  or  exces- sively  worn 6 Drive gear (14) Inspect Replace if damaged or distorted, or if gear  teeth  missing,  broken,  pitted  or excessively  worn 7 Nuts (1, 7, and 12), Inspect Replace if worn, or if threads damaged washers (2 and 13) and cap  screws  (6) 8 Spring  (11) Inspect Install in spring tester. Check that force to compress spring to 0.95 inch is 6 pounds, 4 ounces, and that free length is 1.22  inches.  Replace  spring  if  above specifications are not met, or if coils distorted or broken 3-81