TM 5-2420-230-24-2
Valve Seats - Grinding (2-12)
Cylinder Head - Group 2
Page 2-16
B Series Shop Manual
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 grind-
ing 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 mea-
sure 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.
L-279