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

WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, 2001 BMW X5, and 2000 BMW X5. 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

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 "OSLASH" of the seat face
Valve seat width

Specified values (1 to 5),

refer to ENGINE - TECHNICAL DATA - X5 .

Fig 2: Identifying Valve Seat Angles

Courtesy of BMW OF NORTH AMERICA, INC.