11 12 527 Remachining a valve seat (M62, S62)

WARNING: This page is about a different car, the 2003 BMW Z8, 2002 BMW Z8, 2001 BMW Z8, and 2000 BMW Z8. However, it is still accessible from the selected car via links, so may be relevant.

(cylinder head dismantled)

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

Fig 1: Machining Valve Seat Surface

Courtesy of BMW OF NORTH AMERICA, INC.

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.

Valve-seat angle
Correction angle, external diameter
Correction angle, internal diameter
Outside phi of the seat face
Valve seat width

Fig 2: Identifying Components Of Valve Seat

Courtesy of BMW OF NORTH AMERICA, INC.

Specified values (1 to 5), refer to 11 12 CYLINDER HEAD WITH VALVE SEAT COVER S62 .