Replacing Valve Seat Ring

1. Cut away the inner face of the valve seat to reduce the wall thickness.
   Fig 1: Identifying Inner Face Of Valve Seat

   Courtesy of HYUNDAI MOTOR CO.
2. Enlarge the diameter of the valve seat so that it matches the specified hole diameter of the new valve seat ring.
   Fig 2: Enlarging Diameter Of The Valve Seat

   Courtesy of HYUNDAI MOTOR CO.
   Fig 3: Valve Seat Ring Oversizes

   Courtesy of HYUNDAI MOTOR CO.
3. Heat the cylinder head to about 250°C (480°F) and press-fit an oversize seat ring for the bore in the cylinder head.
4. Using lapping compound, lap the valve to the new seat.

Valve seat contact width 

Intake : 1.1 ~ 1.5 mm (0.043 ~ 0.059 in.)

Exhaust : 1.3 ~ 1.7 mm (0.051 ~ 0.067 in.)