TM 5-3810-307-24-2-2
Valve Guide Inspection (2-05)
Inspect the valve guides for scuffing or scoring.
Measure the valve guide bore.
Valve Guide Bore Diameter
mm
in
8.019
MIN
0.3157
8.090
MAX
0.3185
If the inspection reveals damaged valve guides, refer to
the Alternative Repair Manual, Bulletin No. 3810234.
Cylinder Head Combustion
Face
Inspection (2-06)
Visually inspect the cylinder head combustion surfaces
for any irregularities (dents, guttering, fire ring embed-
ment, etc.). If any of these conditions exist, the surface
must be machined in accordance with the appropriate
procedure from the Alternative Repair Manual, Bulletin
No. 3810234.
Measure the cylinder head overall flatness:
End-to-End
0.305 mm [0.012 in] (6B)
0.203 mm [0.008 in] (4B)
Side-to-Side 0.076 mm [0.003 in]
Visually inspect for any localized dips or imperfections. If
present, the cylinder head deck must be reground.
Valve Seat Inspection (2-07)
Inspect the valve seats for cracks or burned spots.
Refer to the following reuse guidelines for any cracks
discovered. Service valve seats are available for seats
with burned spots that will require more than 0.254 mm
[0.010 in] grinding to clean up. Refer to the Alternative
Repair Manual, Bulletin No. 3810234, for valve seat in-
stallation procedures.