Remachining A Valve Seat

WARNING: This page is about a different car, the 2003 BMW 530i, 2002 BMW 530i, and 2001 BMW 530i. However, it is still accessible from the selected car via links, so may be relevant.

Cylinder head dismantled, refer to 11 12 503 DISASSEMBLING AND ASSEMBLING CYLINDER HEAD (M52/S52/M52TU/M54/M56) .

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 Machine Valve Seat Surface With 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 prespecified diameter to produce valve seat width (5).

Fig 2: Identifying Valve Seat Angles

Courtesy of BMW OF NORTH AMERICA, INC.

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

Specified values (1 to 5), refer to ENGINE - TECHNICAL DATA .