TM 10-3930-659-34 4-24.  FUEL INJECTION PUMP REPLACEMENT (Con’t). C.          INSTALLATION AND ADJUSTMENT 1. Ensure that No.  I piston is at TDC (see subparagraph a). 2. Install woodruff key (29) on drive shaft (27). CAUTION Ensure that drive shaft seals are not inverted when installing drive shaft into fuel injection pump. An inverted seal will cause fuel injection pump to leak. 3. Install drive shaft (27) in fuel injection pump (6). 4-99