Valve Seat: Service and Repair

(cylinder head dismantled)





Machine valve seat face with Special Tool 00 3 520 or 00 3 580 with specifications of tool manufacturer.






Note: After machining the valve-seat face on OD and bore diameter, rework to specified diameter with correction milling tool until valve seat width (5) is obtained.
1. Valve-seat angle
2. Correction angle, outer
3. Correction angle, inner
4. Outside diameter of seat face
5. Valve-seat width
Position (1) to (5) refer to Engine, Specifications