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TM 5-4320-305-24
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
re-moved from the cylinder head.
4-49
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