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

Special tools required:

NOTE: For special tools, refer to ENGINE - SPECIAL TOOLS .

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: Identifying Special Tool

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 pre-specified diameter to produce valve seat width (5).

Valve-seat angle
Correction angle, outside

Fig 2: Identifying Valve-Seat Angle

Courtesy of BMW OF NORTH AMERICA, INC.