136 CYLINDER HEAD AND VALVE TRAIN
Figure 177 Checking valve recession
6. Install valve in guide. Use a depth micromete
r
to check valve recession. If valve recessio
n
is excessive, install a new valve or replac
e
valve seat as necessary. If the valve prot
rudes
above the surface of the cylinder head, re
grind
the valve seat. After grinding the va
lve seat,
check valve seat width again. Also c
heck the
valve face-to-valve seat contact
(Checking Valve
Face-to-Valve Seat Contact, page
134).
7. Use an appropriate dial indicator
to check
the valve seat runout. If runout e
xceeds
specifications, replace valv
eseat.
Replacing Valve Seats
Removal
Figure 178 Grinding group tool
1. Air motor
2. Grinding base
3. Grinding wheel
1. Use grinding group tool (Table 17) to cut a groove
in the valve seat insert.
Figure 179 Grinding groove in valve seat
2. Position the appropriate size extractor in the valve
seat.
EGES-265-2
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
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