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

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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: Machining Valve Seat

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).

See CYLINDER HEAD WITH COVER

Fig 2: Identifying Valve-Seat Surface

Courtesy of BMW OF NORTH AMERICA, INC.