TM 9-2815-237-34 2-32.  FUEL  INJECTION  PUMP  REPAIR  (Cont’d) 49. 50. 51. 52. 53. 54. 55. 56. 57. 58. Rotate housing (11) and holding fixture in vise so advance plug (8) faces up. Install  O-ring  (6)  on  head  locating  screw  (7). Lightly coat head locating screw (7) with seal lubricant and install in housing (11). Tighten screw (7) to 180-220 lb-in. (20-25 N•m) using 5/16-in. hex head driver. Install servo advance piston (14) in housing (11) with notch and two small holes facing head locating screw  (7). Install O-ring (13) and power side advance piston hole plug (12) in housing (11). Tighten plug (12) to 215-265 lb-in. (24-30 N•m). NOTE Rotate  cam  ring  to  align  hole  for  cam  advance  pin  in  housing. Install  cam  advance  pin  (10). Install O-ring (9) and advance plug (8) in housing (11). Tighten advance plug (8) with 1/4-in. hex head  driver  to  75-100  lb-in.  (9-11  N•m). Install servo advance valve (5) on spring (4) and install servo advance valve (5) in servo advance piston  (14). Install  servo  advance  plunger  (1)  and  O-ring  (3)  on  spring  side  plug  (2). Install spring side plug assembly (2) in housing (11) so servo advance plunger (1) fits in spring (4). Tighten  sprinig  side  plug  assembly  (2)  to  215-265  lb-in.  (24-30  N•m). 2-116