Trooper LS V6-3.5L (1998)
2. Measure the valve seat contact width. Make the necessary corrections if the seat contact surface is damaged or rough or if the contact width wear
exceeds the limit.
Valve seat contact width:
Standard: 1.1 mm (0.0433 inch)
Limit: 1.7 mm (0.0669 inch)
Contact Surface Angle on Valve Seat on Valve
1. Measure contact surface angle on valve seat.
2. If the measured value exceeds the limit, replace valve, valve guide and valve seat as a set.
Valve contact surface angle: 45°
Valve Seat Insert Correction
1. Remove the carbon from the valve seat insert surface.
2. Use a valve cutter to minimize scratches and other rough areas. This will bring the contact width back to the standard value. Remove only the
scratches and rough areas. Do not cut away too much. Take care not to cut away unblemished areas of the valve seat surface.
