TM 10-4320-309-14
TM 4320-14/1
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Check that the inside diameter of each valve guide does not exceed 0.2197 inch (5.58 mm).
Figure 5-6. Intake Exhaust Valve Assembly
Clean off carbon deposits on the valve seats since carbon buildup, excessive wear, and corrosion can
cause compression leaks.
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.
Check the valve spring for flaw or corrosion.
Check that the valve spring free length (dimension A) is less than 1.043 inches (26.5 mm).
Figure 5-7. Spring Inclination
Check that the spring inclination (how far spring inclines to the left or right, dimension B) is less than
0.039 inch (1.0 mm).
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