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

WARNING: This page is about a different car, the 2005 BMW Z4, 2004 BMW Z4, and 2003 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

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 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

Specified values (1 to 5) . See Fig 2.

Fig 2: Identifying Machining Of Valve Seat Surface

Courtesy of BMW OF NORTH AMERICA, INC.