11 12 527 Remachining a valve seat - cylinder head disassembled (N62)

WARNING: This page is about a different car, the 2010 BMW 550i, 2009 BMW 550i, and 2008 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

00 3 520 . See MAINTENANCE AND GENERAL INFORMATION - SPECIAL TOOLS .
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).
See ENGINE - TECHNICAL DATA (N62TU) .

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

Items (1) to (5).

Fig 2: Identifying Valve-Seat Angle

Courtesy of BMW OF NORTH AMERICA, INC.