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

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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: Surfacing Valve Seat 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).

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

Fig 2: Remachining Outside & Inside Diameters

Courtesy of BMW OF NORTH AMERICA, INC.

Specified values (1 to 5).