TM  10-3930-638-24&P 4-3.   FUEL   SYSTEM   MAINTENANCE   (cont) b. Fuel Injection Pump (cont). STEP LOCATION ITEM ACTION REMARKS REASSEMBLY (cont) 30 (cont) h. Pump and fixture i. Two seals (65) j.  Head  locating screw (64) k. Cam advance screw (80) l. Seal (78) m. Piston ring (79) n. Two seals (69) o. Two seals (75) p. Shim (73) q. Advance adjusting spring (72) r. Piston (71) s. Slide washer (70) t. Advance piston hole plug (68) u. Power piston (77) v.  Slide  washer  (76) w.  Power  piston hole plug (74) Invert  in  vise so  bottom faces  upward Install Install Install Assemble Assemble Assemble Assemble Assemble Install Assemble Install Install Assemble Assemble Install On head locating screw (64) Tighten to 180-220 pounds inch torque Use tools P/N 15499 and 15500; tighten to 440-460 pounds inch torque Into groove of power piston (77) Into  groove  of  power  piston  (77) Into grooves of advance piston hole plug (68) Into grooves on power piston hole plug (74 On spring (72); use small amount of grease to hold in position In piston (71) To advance piston hole plug (68) On  piston  (71);  use  small  amount  of  grease applied  to  piston  end  to  keep  slide  washer in  position Finger tighten To power piston hole plug (74); use tool P/N 16199 To power piston (77); use small amount of grease  applied  to  piston  end  to  keep  slide washer in position Finger tight NOTE Power piston (77) is installed in side of housing marked C for a clockwise rotating pump. x. New seal (67) Install On advance screw hole plug (66) y. Advance screw Install Tighten to 180-220 pounds inch torque hole  plug  (66) using tool P/N 14490 z.  Advance  piston Tighten Tighten to 215-265 pounds inch torque hole plug (68) and  power  piston hole  plug  (74) 4-120