Valve Seat: Service and Repair

11 12 527 - Remachining a valve seat (M52/S52/M52TU/M54/M56)





Special tools required:
- 00 3 520 00 3 520 Valve Seat Turning Tool in Case (Hunger)
- 00 3 580 00 3 580 Set of Valve Seat Milling Cutters in Case (Neway)

(cylinder head dismantled)





Machine valve seat surface with special tool 00 3 520 00 3 520 Valve Seat Turning Tool in Case (Hunger) or with special tool 00 3 580 00 3 580 Set of Valve Seat Milling Cutters in Case (Neway) in accordance with manufacturer's instructions.





Note:
After machining the valve seat surface, remachine the outside and inside diameters with a correction milling tool to the prespecified diameter to produce valve seat width (5).

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).