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TM 10-4320-311-14
INSPECTION:
WARNING
Death or serious injury could occur if compressed air is directed against skin. Do not use
compressed air for cleaning or drying unless the pressure is/has been reduced to 30 PSI or less.
When working with compressed air, always use eye protection and any other protective
equipment.
CAUTION
· Do not confuse the intake and exhaust valve stems.
· The intake/exhaust valve guides are provided with a valve stem seal. Valve stem seals
cannot be reused and must be replaced with new ones.
· When inserting the intake and exhaust valve stems, apply lube oil to the valve stems.
a.
Clean cylinder head and valves with a clean cloth dampened with diesel fuel. Use wire brush where necessary
and dry with compressed air.
b.
Inspect cylinder head for cracks, corrosion, or excessive heat damage
c.
Inspect valve heads and valve stems for cracks, pitting, scratches, warpage, or any other damage
d.
Refer to Figure 6-3. Check that each valve stem diameter is greater than 0.2126 inch (5.40 mm).
e.
Reinsert valves into the cylinder head and check that each valve recess is less than 0.043 inch (1.1 mm)
f.
Check that the inside diameter of each valve guide does not exceed 0.2197 inch (5.58 mm).
g.
Clean off carbon deposits on the valve seats since carbon buildup, excessive wear, and corrosion can cause
compression leaks
h.
Replace cylinder head if any of the following conditions exist:
cylinder block contact surface is roughened or not level the valve seats are worn
the valve rocker arm cover contact surface is rough or damaged
there are cracks between the valve seats.
i.
Check the valve spring for flaw or corrosion
j.
Refer to Figure 6-4. Check that the valve spring free length (dimension A) is more than 1.043 inches (26.5 mm).
k.
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).
I.
Check that the OD of the valve rocker arm support shaft is more than 0.4685 inch (11.90 mm).
m.
Check that the ID of the valve rocker arm does not exceed 0.4764 Inch (12.1 mm).
6-6
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