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

WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, and 2001 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

For Special Tool identification, see SPECIAL TOOLS - X5 (3.0i) .

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: Identifying Valve Seal Milling Cutters

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 ENGINE - TECHNICAL DATA .

Fig 2: Valve Seat Diameters
Courtesy of BMW OF NORTH AMERICA, INC.