11 12 527 Remachining A Valve Seat - Cylinder Head Disassembled (N62)

WARNING: This page is about a different car, the 2005 BMW 645Ci and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

For Special Tool identification, refer to ENGINE - SPECIAL TOOLS - 645CI .

Special Tools Required:

00 3 520
00 3 580

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

Fig 1: Identifying Valve Seat Turning 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, external diameter.
Correction angle, internal diameter.
Valve seat, external diameter.
Valve seat width.

Items (1) to (5), refer to ENGINE - TECHNICAL DATA - 645CI .

Fig 2: Identifying Valve-Seat Angle, External/Internal Diameter And Valve Seat Width

Courtesy of BMW OF NORTH AMERICA, INC.