Town & Country Van AWD V6-230 3.8L VIN L SMFI (1998)
Valve Specification Chart
1. Inspect the remaining margin after the valves are refaced Refer to Valve Dimension Chart.
Valve Seats
Refacing Valve Seats
CAUTION: Remove metal from valve seat only. Do not remove metal from cylinder head.
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 dial indicator. Total runout should not exceed 0.051 mm (0.002 inch) total indicator reading.
3. Inspect the valve seat using 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 top edge of valve face, lower valve seat with a 15 degree stone. If the blue is transferred to the bottom edge of valve face raise
valve seat with a 65 degrees stone.
NOTE: Valve seats which are worn or burned can be reworked, provided that correct angle and seat width are maintained. Otherwise cylinder
head must be replaced.
