TM 5-2420-230-24-2
Cylinder Head - Group 2
Valve Seats - Grinding (2-12)
B Series Shop Manual
Page 2-17
The valve depth is the distance from the valve face to the
head deck.
Record the depth of each valve as (A).
Valve Depth
mm
in
0.99
MIN
0.039
1.52
MAX
0.060
If valve depth does not meet specification the valve seat
must be replaced.
After valves meet initial valve depth criteria, grind the
valve seats to remove all scores, scratches and burns.
Seat Angle
Intake: 30 Degrees
Exhaust: 45 Degrees
3823495 Gauge Block
Since the seats have been ground, it is necessary to
re-measure the valve depth and to calculate the grinding
depth.
Install the valves in their respective bores and measure
the depth. Record the depth of each valve as (B).
Make sure the seats are clean before you measure the
depth.
L-280