TM  10-3930-638-24&P 3-6.   FUEL   SYSTEM   MAINTENANCE   (cont) c. Fuel Injection Pump (cont). STEP LOCATION ITEM ACTION REMARKS REMOVAL 1 2 Fuel  injection pump  (3) NOTE If the same injection pump is to be reinstalled, scribe small match marks on injection pump flange and timing gear housing to aid in installation. a. b. c. Timing  gear a. housing Three nuts (1) and Loosen  and Support pump (3) washers (2) remove Injection pump (3) Remove Carefully pull off of drive shaft (15) O-ring  (4) Remove  and discard Two seals (5) Remove  and discard NOTE The following steps cover removal of drive shaft (15) and drive gear (14). If injection pump is to be replaced, drive shaft (15) must be  forwarded  to  general  support  maintenance  with  defective pump. If only O-ring (4) and seals (5) require replacement, proceed to step 14. b. c. d. e. f. g. Seven cap screws (6) and two nuts (7) Cover  plate  (8) Gasket (9) Thrust  plunger  (10) and  spring  (11) Nut (12) and lock washer (13) Drive gear (14) Loosen  and remove Remove From  engine  timing  gear  housing Remove  and Remove  all  gasket  residue  from  timing discard gear housing and cover plate (8) Pull and remove Loosen  and remove Remove From drive shaft (15) NOTE Replacement drive shaft (15) includes roll pin (16). Perform the following step only if roll pin (16) is sheared and drive shaft (15) is^- not  damaged. h. Roll pin (16) Remove From drive shaft (15). Use 3/32 inch drift or carbide tipped drill bit 3-80