Valve Seat Replacement Procedure

WARNING: This page is about a different car, the 2003 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

Cut the valve seat from the inside to thin the wall thickness. Then, remove the valve seat.

Fig 1: Identifying Valve Seat Cutting Thickness Dimension
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Rebore the valve seat hole in the cylinder head to a selected oversize valve seat diameter.
1. Intake seat ring hole diameters
2. 0.3 oversize 34.30 - 34.33 mm (1.3504 - 1.3515 inches)
3. 0.6 oversize 34.60 - 34.63 mm (1.3622 - 1.3633 inches)
1. Exhaust seat ring hole diameters
2. 0.3 oversize 31.80 - 31.83 mm (1.2520 - 1.2531 inches)
3. 0.6 oversize 32.10 - 32.13 mm (1.2638 - 1.2649 inches)
  
  Fig 2: Identifying Oversize Valve Seat Diameter And Height Dimension
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Before fitting the valve seat, either heat the cylinder head up to approximately 250°C (482°F) or cool the valve seat in liquid nitrogen, to prevent the cylinder head bore from galling.
Using a valve seat cutter, correct the valve seat to the specified width and angle.
See "VALVE SEAT RECONDITIONING PROCEDURE ".