TM 5-1940-277-34 INJECTION PUMP REPLACEMENT INSTRUCTIONS (Continued) LOCATION ITEM ACTION REMARKS 3. Fly wheel and 21 degree mark on Line 21 degree One person will camshaft gear flywheel and mark up with use 15/16 in rear straight mark on timing mark that socket and hinge face camshaft gear rear appears on edge of handle on nut for face viewing port crankshaft pulley opposite the at the front of securing bolt. At engine to rotate the same time this engine.    At the is lined up, the same time a second mark on the rear person using an face of the inspection mirror camshaft gear must must observe the be visible. flywheel port to Rotate engine line up the 21 until both degree mark on the conditions are flywheel and the satisfied. pointer on the flywheel housing and check the rear face of the camshaft gear to see that the mark is visible in the opening left by removal of the injection pump. BOTH CONDITIONS MUST BE SATISFIED. This puts engine piston in proper position relative to injection pump positioning. 4. Injection pump a. Timing hole Unscrew from pump Use 3/8 in hex key (1) plug (14) mounting flange. wrench (Allen). NOTE Modify hex key wrench if required.  Refer to Appendix C, Figure C-4. Change 6  2-251