RAM 2500 Truck 4WD V10-8.0L VIN W (1997)
Valve Seat: Service and Repair
NOTE: The intake and exhaust valves have a 45° face angle and a 45° to 44 1/2° seat angle.
1. When refacing valve seats, it is important that the correct size valve guide pilot be used for reseating stones. A true and complete surface must be
obtained.
2. Measure the concentricity of valve seat using a dial indicator. Total runout should not exceed 0.038 mm (0.0015 inch) total indicator reading.
3. Inspect the valve seat with Prussian blue to determine where the valve contacts the seat. To do this, coat valve seat LIGHTLY with Prussian blue then
set valve in place. Rotate the valve with light pressure. If the blue is transferred to the center of valve face, contact is satisfactory. If the blue is
transferred to the top edge of valve face, lower valve seat with a 15° stone. If the blue is transferred to bottom edge of valve face raise valve seat with
a 60° stone.
4. When seat is properly positioned the width of valve seats should be 1.016 - 1.524 mm (0.040 - 0.060 inch).