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

WARNING: This page is about a different car, the 2002 BMW Z3 and 2001 BMW Z3. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

For Special Tool identification, see SPECIAL TOOLS - Z3 .

Special Tools Required:

00 3 520
00 3 580

(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.

Fig 1: Machining Valve Seat Surface

Courtesy of BMW OF NORTH AMERICA, INC.

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).

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

Specified values (1 to 5). Refer to 11 12 CYLINDER HEAD WITH VALVE SEAT COVER M54 B 30 or 11 12 CYLINDER HEAD WITH VALVE SEAT COVER M54 B22 or 11 12 CYLINDER HEAD WITH VALVE SEAT COVER M54 B25

Fig 2: Identifying Valve-Seat Dimensions

Courtesy of BMW OF NORTH AMERICA, INC.