Intrepid V6-3.5L VIN K (2003)
Valve Seat: Service and Repair
VALVE AND VALVE SEAT REFACING
The valve face and valve seat angles are shown in (Fig. 28).
VALVES
1. Inspect the remaining margin after the valves are refaced (Fig. 27).
VALVE SEATS
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 in.) 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 top edge of valve face, then lower valve seat with a 15 degree stone. If the blue is transferred to the bottom edge of valve face,
then raise valve seat with a 65 degree 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.
4. When seat is properly positioned the width of the intake seats should be 0.75 to 1.25 mm (0.0296 to 0.0493 in.) and exhaust seats should be 1.25
to 1.75 mm (0.049 to 0.069 in.) (Fig. 28).