Removal & Installation

(cylinder head dismantled)

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

Fig 1: Machining Valve Seat Surface With Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: After machining the valve seat surface, remachine the outside and inside diameters with a correction milling tool to the prespecified diameter to produce valve seat width (5).

Valve-seat angle
Correction angle, outside
Correction angle, inside
Outside diameter seat face
Valve-seat width

Specified values (1 to 5).

Fig 2: Locating Valve Seat Width

Courtesy of BMW OF NORTH AMERICA, INC.