Replacing Valve Seats; Removal - Navistar INTERNATIONAL DT 466 Service Manual

136
Figure 177 Checking valve recession
6. Install valve in guide. Use a depth micrometer
to check valve recession.
is excessive, install a new valve or replace
valve seat as necessary. If the valve protrudes
above the surface of the cylinder head, regrind
the valve seat. After grinding the valve seat,
check valve seat width again. Also check the
valve face-to-valve seat contact (Checking Valve
Face-to-Valve Seat Contact, page134 ).
7. Use an appropriate dial indicator to check
the valve seat runout.
specifications, replace valve seat.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
CYLINDER HEAD AND VALVE TRAIN
If valve recession
If runout exceeds
EGES-265-2
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.

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.