11 12 527 Remachining A Valve Seat - Cylinder Head Disassembled (S50/S54)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW M3, 2005 BMW M3, 2004 BMW M3, 2003 BMW M3, and 2002 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

Machine valve seat surface with special tool 00 3 520 or with 00 3 580 in accordance with tool manufacturer's instructions.

Fig 1: Machining Valve Seat Surface With Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: After machining valve-seat surface: Remachine outside and inside diameters with correction milling tool to the) specified diameters until you obtain valve seat width (5).

Valve-seat angle.
Correction angle, outside.
Correction angle, inside.
Outside diameter of seat face.
Valve-seat width.
Items (1) to (5). Refer to ENGINE - TECHNICAL DATA .

Fig 2: Sectional View Of Valve Seat
Courtesy of BMW OF NORTH AMERICA, INC.