Checking Valve Face-To-Valve Seat Contact - Navistar INTERNATIONAL DT 466 Service Manual

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Figure 171 Grinding valve stem
2. Install the valve in the grinder so that the tip of the
valve stem is close to the grinding stone.
3. Briefly touch the tip of the valve stem to the
grinding stone. Only remove the minimum
amount of material that is necessary.

Checking Valve Face-to-Valve Seat Contact

Figure 172 Applying Prussian Blue® to valve
face
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
CYLINDER HEAD AND VALVE TRAIN
EGES-265-2
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
1. After refacing a valve, spread a thin film of
Prussian Blue® on the valve face and insert the
valve in the valve guide.
Figure 173 Turning valve on valve seat
2. Apply pressure on the center of the valve head
while turning the valve 90 degrees on the valve
seat.
3. Remove the valve from the cylinder head. Check
the impression that was made on the valve seat
and valve face. Prussian Blue should appear
around the entire contact surface of the valve
seat and valve face.
4. Perform this check several times to rule out any
errors. If the Prussian Blue® contact impression
is good, proceed to valve installation.
Prussian Blue® contact impression is not good,
continue with resurfacing valve seats.
If the