11 12 719 Surface grinding cylinder head lower face (S63)

Necessary preliminary work:

Cylinder head disassembled:

Check evenness of cylinder head lower face with a standard straightedge (1).

NOTE: Maximum deviation from flatness: longitudinal 0.10 mm.

Fig 1: Checking Evenness Of Cylinder Head Lower Face (Longitudinal)

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Maximum deviation from flatness: transversal 0.05 mm.

Machining limit

Fig 2: Checking Evenness Of Cylinder Head Lower Face (Transverse)
Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: A cylinder head gasket (+REP) 0.3 mm thicker than usual can be obtained for machined (resurfaced) cylinder heads.

Fig 3: Identifying Cylinder Head Gasket (+REP)

Courtesy of BMW OF NORTH AMERICA, INC.