11 12 527 Remachining a valve seat (M62, S62)

WARNING: This page is about a different variant/trim than selected.

(cylinder head dismantled)

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

Fig 1: Machining Valve Seat Surface With Special Tool

Courtesy of BMW OF NORTH AMERICA, INC.

After machining the valve-seat face on OD and bore diameter, rework to specified diameter with correction milling tool until valve seat width (5) is obtained.

Valve-seat angle
Correction angle, external diameter
Correction angle, internal diameter
Outside "OSLASH" of the seat face
Valve seat width

Specified values (1 to 5),

refer to ENGINE - TECHNICAL DATA - X5 .

Fig 2: Identifying Valve Seat Angles

Courtesy of BMW OF NORTH AMERICA, INC.