11 12 527 Remachining a valve seat - cylinder head disassembled (S50 / S54)

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

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

Fig 1: Machining Valve Seat Surface

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: After machining valve-seat surface: Remachine outside and inside diameters with correction milling tool to the specified diameters until you obtain valve seat width (5).

Fig 2: Identifying Valve Seat Width

Courtesy of BMW OF NORTH AMERICA, INC.

Valve-seat angle
Correction angle, outside
Correction angle, inside
Outside diameter of seat face
Valve-seat width

For dimensions of Items (1) to (5), refer to 11 12 CYLINDER HEAD WITH VALVE SEAT COVER S54 .