TM 5-3810-307-24-2-1
Valves
Adjustment
15 mm
Remove the valve cover.
1/2 Inch Drive, 3824591 Engine Barring Gear
Locate Top Dead Center (TDC) for Cylinder
Number 1 by barring engine slowly while pressing
on the engine timing pin.
The barring gear inserts into the flywheel housing
and engages the flywheel ring gear. The engine can
then be rotated by hand using a 1/2 inch ratchet or
breaker bar.