Trooper LS V6-3.5L (1998)
Valve seat angle degree: 90°
3. Apply abrasive compound to the valve seat insert surface.
4. Insert the valve into the valve guide.
5. Turn the valve while lapping it to fit the valve seat insert.
6. Check that the valve contact width is correct.
7. Check that the valve seat insert surface is in contact with the entire circumference of the valve.
Valve Seat Insert Replacement
1. Arc weld the rod at several points. Be careful not to damage the aluminum section.
2. Allow the rod to cool for a few minutes. This will cause the valve seat to shrink.
3. Strike the rod and pull it out.
4. Carefully clean the valve seat press-fit section on the cylinder head side.
5. Heat the press-fit section with steam or some other means to cause expansion. Cool the valve seat with dry ice or some other means.
6. Insert the press-fit section into the valve seat horizontally.
Standard fitting interference: 0.14 mm - 0.O9 mm (0.0055 inch - 0.0035 inch)
7. After insertion, use a seat grinder to grind finish the seating face. Carefully note the seating angle, the contact width, and the depression.
8. Lap the valve and the seat.
REASSEMBLY
1. Install valve guide (1) to cylinder head. Apply engine oil to the outside of the valve guide. Using valve guide replacer J-42899, drive in a new
valve guide from the camshaft side.
