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TM 10-4320-348-14
b.
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.
(1)
Clean cylinder head and valves with a clean cloth dampened with diesel fuel. Use wire brush where
necessary and dry with compressed air.
(2)
Inspect cylinder head for cracks, corrosion, or excessive heat damage.
(3)
Inspect valve heads and valve stems for cracks, pitting, scratches, warpage, or any other damage.
(Refer to Figure 6-3)
(4)
Check that each valve stem diameter is greater than 0.2126 inch (5.40 mm).
(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 should be between 0.2126 inch (5.40 mm) and 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.
Figure 6-3. Valve Recess
6-5
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