TM 9-4940-568-34
7-20
7-4. CYLINDER HEAD REPAIR (CONT).
(21)
Check valve stem tip for flatness.
(22)
Using grinding wheel, re-surface valve tip
if inspection indicates it is necessary.
(23)
The illustrated marks indicate valve seats
have been ground previously. Previously
re-ground seats can be replaced with
service seats.
(24)
Install valves in their designated location
and measure valve depth.
(25)
The valve depth is the distance from valve
face to head deck. Record depth of each
valve as A. The valve depth minimum is
0.039 in. (0.99 mm) and maximum is 0.060
in. (1.52 mm).
(26)
Grind valve seats to remove scores,
scratches and burns.
(27)
Check seat angle of cylinder head. Intake
is 30 degrees and exhaust is 45 degrees.
