TM 9-6115-664-13&P
4-47. VALVE CLEARANCE ADJUSTMENT
6.
Insert manual crank handle into handle access hole
in nose piece and connect to engine crankshaft.
7.
Turn crankshaft slowly until intake valve begins to
open, then rotate handle 180 degrees. Top dead
center is reached when crank drive pin (19) is in
horizontal position and maximum clearance occurs
between rocker arm and exhaust valve.
8.
Using a feeler gauge, check clearance between
rocker arm (11) and exhaust valve (16). Clearance
shall be 0.1 mm (.004 in.).
9.
If clearance between rocker arm (11) and exhaust
valve (16) requires adjustment, loosen rocker arm
locknut (13) and rotate rocker screw (14). Tighten
locknut and recheck clearance.
10. Using handle, turn crankshaft approximately 1/4 turn
in direction of rotation. Crank drive pin (19) shall be
in vertical position.
11. Using a feeler gauge, check clearance between
rocker arm (12) and inlet valve (15). Clearance shall
be 0.1 mm (.004 in.).
12. If clearance between rocker arm (12) and inlet valve
(15) requires adjustment, loosen rocker arm locknut
(17) and rotate rocker screw (18). Tighten locknut
and recheck clearance.
13. Mate new cover gasket (10) to engine cylinder head.
Install rocker cover (74) and secure using nut (5)
and washer (6).
14. Close valve access door (2) and lock by turning door
latches.
15. Mate engine exhaust bellows (1) to rear of valve
access door (2). Connect hose (3).
16. Close top front cover and secure using latches.
Figure 4-37. Valve Clearance Adjustment
(Sheet 2 of 2)
4-113
