TM 5-4320-302-14
6-9. VALVES, VALVE GUIDES, AND VALVE SEAT (CONT)
Location/Item
Action
Remarks
b.
Inspect other components for
pitting, fractures, excessive
wear, or other damage. In-
spect compression spring for
proper length. Fatigued (un-
loaded) length shall be not
less than 2.2047 inches (56
mm). Normal (replacement)
length (unloaded) is 2.3228
inches (59 mm).
2.
Valve guides
Use a guide brush to clean the inside of valve
Valve guides and
guides, and inspect the guides for fractures,
valve seat inserts can
excessive wear.
be inspected and
cleaned without being
removed from the cyl-
inder head.
3.
Valve guide/
Measure with micro feeler gage. The valve
valve stem
stem/valve guide clearance limit is 0.0118
clearance
inch (0.3 mm). The exhaust valve stem/guide
clearance limit is 0.0197 inch (0.5 mm). If
the clearance is greater than the limit speci-
fied, replace valve guides.
6-51
