11 12 719 Grinding cylinder head sealing surface (N63)

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Necessary preliminary work:

Remove RIGHT CYLINDER HEAD or LEFT CYLINDER HEAD .

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 Cylinder Head Lower Face Evenness Using Standard Straightedge (Maximum Deviation Longitudinal 0.10 mm)

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Maximum deviation from flatness: transversal 0.05 mm.

Machining limit . See CYLINDER HEAD WITH VALVE SEAT COVER or CYLINDER HEAD WITH LID, BMW, N63, B44 .

Fig 2: Checking Cylinder Head Lower Face Evenness Using Standard Straightedge (Maximum Deviation Transversal 0.05 mm)
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.