TM 10-3930-659-20 5-1. CYLINDER HEAD VALVES ADJUSTMENT (Con't). ADJUSTMENT 1. Remove plugs (2 and 3) from engine (1). 2. Install flywheel turning tool (4) on engine (1). 3. Turn   flywheel   turning   tool   (4)   clockwise   until timing pin (5) can be installed on engine (1) and engages flywheel. 4. Remove two screws (10), cover (9), and gasket (8) from fuel injection pump (11).  Discard gasket. 5. Note timing marks (6 and 7). (a) If timing mark (6) is visible, No.  1 piston is at top dead center (TDC) on the compression stroke.  Skip step 6 and perform step 7. (b) If timing mark (6) is not visible, perform step 6. TA706843 5-2