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 TM 55-1905-220-14-5
3-90.2. EXHAUST VALVE - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
Inspection (Cont)
15.
Remove and discard the valve guide
valve
oil seals if used.
guides
(11)
Clean the inside diameter of the
valve guides with a brush. This
brush will remove all gum or carbon
deposits from the guides, including
the spiral grooves.
Inspect the valve guides for frac-
tures, chipping, scoring, or exces-
sive wear. Check the valve-to-guide
clearance, since worn valve guides
may eventually result in improper
valve seat contact. If the clear-
ance exceeds .005 inch (0.0127 cm),
replace the valve guides.
16.
Inspect the valve seat inserts for
valve
excessive wear, pitting, cracking
seat
or an improper seat angle. The
insert
proper angle for the seating face
(12)
of both the valve and insert is 30
.
When a valve seat insert has been
ground to such an extent that the
30angle will contact the cylin-
der head, install a new insert.
3-1538
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