TM 9-4310-394-13
5-10. CYLINDER HEAD ASSEMBLY REPAIR AND REPLACEMENT. - Continued.
b.
Inspection. - Continued.
Figure 5-7. Valve Recess.
Figure 5-8. Spring Inclination.
(5)
Reinsert valves into the cylinder head and check that each valve recess is less than 0.043 inch (1.1 mm).
(6)
Check that the inside diameter of each valve guide does not exceed 0.2197 inch (5.58 mm).
(7)
Clean off carbon deposits on the valve seats since carbon buildup, excessive wear, and corrosion can
cause compression leaks.
(8)
Replace cylinder head if any of the following conditions exist: If cylinder block contact surface is roughened
or not level; if the valve seats are worn; if the valve rocker arm cover contact surface is rough or damaged; or if there are
cracks between the valve seats.
(9)
Check the valve spring for flaw or corrosion.
(10)
Refer to Figure 5-8. Check that the valve spring free length (dimension A) is more than 1.043 inches (26.5
mm).
(11)
Check that the spring inclination (how far spring inclines to the left or right, dimension B) is less than 0.030
inch (0.75 mm).
(12)
Check that the OD of the valve rocker arm support shaft is more than 0.4685 inch (11.90 mm).
(13)
Check that the ID of the valve rocker arm does not exceed 0.4764 inch (12.1 mm).
5-16
