11 12 527 Remachining a valve seat (M62, S62)

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 BMW 540i, 2002 BMW 540i, 2001 BMW 540i, 2000 BMW 540i, and 1999 BMW 540i. However, it is still accessible from the selected car via links, so may be relevant.

(cylinder head dismantled)

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

Fig 1: Machining Valve Seat Surface With Special Tool 00 3 520

Courtesy of BMW OF NORTH AMERICA, INC.

After machining the valve-seat face on OD and bore diameter, rework to specified diameter with correction milling tool until valve seat width (5) is obtained.

Valve-seat angle
Correction angle, external diameter
Correction angle, internal diameter
Outside "PHI" of the seat face
Valve seat width

Specified values (1 to 5), refer to ENGINE - TECHNICAL DATA - 540I (E39) .

Fig 2: Identifying Valve-Seat Face Dimension

Courtesy of BMW OF NORTH AMERICA, INC.