TM 5-4320-302-14
5-21.
VALVES, VALVE GUIDES, AND VALVE SEATS (CONT)
Location/Item
Action
Remarks
5. Inlet and
Inspect valves and valve stems. Replace any
exhaust valves
valves that show head warping, burning, or
other damage. Replace valves that have
seriously scratched or scuffed stems; or
pitted, ridged, or cracked faces. Check that
valve joint face thickness is no less than
0.0197 inch (0.5 mm). Replace valve(s) if
joint face thickness is less than required.
6.
Compression
Replace any compression springs that are
springs, valve
pitted, fractured, excessively worn, or
cones, spring
damaged. Replace cones, caps, and valve
caps, and
rotators that are fractured, excessively
valve rotators
worn, or damaged. Replace any spring
that has a fatigued (unloaded) length of
less than 2.2047 inches (56 mm). Normal
(replacement) length (unloaded) is 2.3228
inches (59 mm). Replace both valve
springs if necessary.
5-96