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

WARNING: This page is about a different car, the 2008 BMW Alpina and 2007 BMW Alpina. However, it is still accessible from the selected car via links, so may be relevant.

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 Surface

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).

Fig 2: Identifying Valve-Seat Angle

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Refer to ENGINE - TECHNICAL DATA for specifications.

Valve-seat angle
Correction angle, external diameter
Correction angle, internal diameter
Valve seat, external diameter
Valve seat width