CYLINDER HEAD AND VALVE TRAIN 135
Resurfacing Valve Seats
Figure 174 Installing valve guide pilot
1. Lightly lubricate the correct size of grinding pilot.
Install the pilot into the valve guide.
2. Choose the correct angle grinding stone and
dress the stone. See “Specifications” for the
correct valve seat angle.
3. Install the grinding stone over the pilot.
Figure 175 Grinding the valve seat
1. Motor and drive
2. Holder
3. Grindstone
4. Turn on the power and gently apply the weight of
the grinding motor to the grindstone. Raise the
grinding stone frequently to prevent overheating.
Grind the valve seat to a smooth even finish,
paying attention to achieving an acceptable
uniform width (Table 15).
Figure 176 Checking valve seat width
5. Use a caliper to check the valve seat width. If
the valve seat width exceeds specifications, the
valveseatmaybecorrectedbygrindingwitha15
degree or smaller angle stone.
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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