TM 10-3930-659-34 4-8. IDLER GEARS MAINTENANCE (Con’t). CAUTION To prevent loss of timing, ensure that other gears DO NOT turn when installing lower idler gear. 12. Install lower idler gear (5) on lower idler gearshaft (4). 13. Install bushing (6), thrustwasher (7), and nut (8) on screw (11). Do not tighten nut. 14. Position number one piston at top-dead-center on compression stroke (see paragraph 4-24). 15. Torque nut (8) to 95 lb.-ft. (129 N.m). FOLLOW-ON TASKS: • Install engine front cover (see paragraph 4-14). • Install engine assembly (see paragraph 4-3). 4-43