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TM 10-4320-348-14
(8)
Replace cylinder head if any of the following conditions exist:
(a)
Cylinder block contact surface is roughened or not level.
(b)
The valve seats are worn.
(c)
The valve rocker arm cover contact surface is rough or damaged.
(d)
There are cracks between the valve seats.
(9)
Check the valve spring for flaw or corrosion.
(Refer to Figure 6-4)
(10)
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 (0.76 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).
(14)
Check for bent push rod.
Figure 6-4. Spring Inclination
c.
Repair.
(1)
Replace any components that do not meet inspection criteria.
(2)
Remove slight scratches or scuff marks with crocus cloth.
d.
Installation. (Refer to Figure 6-2)
(1)
Insert new valve stem seals (12) onto valve guide.
(2)
Insert valves (10 and 11) into cylinder head.
(3)
Install valve spring washer (9).
(4)
Compress valve spring (6) and install retainer (8) and retainer keeper (7).
6-6
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