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TM 5-4320-306-24
4-7. REPLACE/REPAIR VALVES, VALVE GUIDES, AND VALVE SEATS (Continued)
3
Inspect valve tulips (7), faces (8), and heads (9) for pitting, ridges, or cracks
4
Check that valve joint face thickness (10) is no less than 0.0197 inch (0 5 mm)
5
Inspect snap rings (3), valve cones (4), and spring caps (5) for pitting, fractures, excessive wear, or other damage
6
Using calipers (1), inspect compression spring (2)
for proper length Fatigued (unloaded) length shall
be not less than 2.2047 inches (56 mm). Normal
(replacement) length (unloaded) is 2 2480 to
2.3976 inches (57 1 to 60.9 mm)
7
Clean the inside of valve guides (1) using brush
(2) and diesel fuel oil Dry with low pressure
compressed air Inspect valve guides for fractures,
chipping, scoring, or excessive wear.
NOTE
Valve guides can be inspected and cleaned without being removed from the cylinder head.
4-49
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