TM 5-3810-307-24-2-2
If required, re-surface the tip.
Valve Seats - Grinding (2-12)
The illustrated marks indicate valve seats have been
ground previously. Additional grinding will result in
grinding past the induction hardened area.
Replace previously re-ground seats will with service
seats. Refer to the Alternative Repair Manual,
Bulletin No. 3810234.
Calculating the Grinding Depth
Measuring the Valve Depth
3823495 Gauge Block
Install the valves in their designated location and
measure the valve depth.
There are two valve seat parameters that are critical
to the valve grinding process. The first is to comply
with the valve depth limits and the second is to not
grind through the hardened layer of the valve seat by
observing the grind depth limit. If either of these
parameters are out of specification, refer to the
"Alternative Repair Manual," Bulletin No. 3810234.