Valve Seat: Service and Repair

Reconditioning A Valve Seat
(Cylinder Head Dismantled)





Machine valve seat surface with special tool 00 3 520 or with special tool 00 3 580 in accordance with manufacturer's instructions.

Note: After machining the outer and inner diameters of the valve seat face with a correction milling tool, rework to the specified diameter until the correct valve seat width (5) is obtained.





1. Valve-seat angle
2. Correction angle, outside
3. Correction angle, inside
4. Outside diameter seat face
5. Valve-seat width

Specified values (1 to 5), refer to Specifications, Mechanical.