11 12 719 Grinding cylinder head lower face (N63O1)

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Necessary preliminary tasks:

Remove cylinder head. See 11 12 105 REMOVING AND INSTALLING LEFT CYLINDER HEAD (N63O1) and 11 12 106 REMOVING AND INSTALLING RIGHT CYLINDER HEAD (N63O1) .

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: See 11 12 CYLINDER HEAD WITH LID or 11 12 CYLINDER HEAD WITH VALVE SEAT COVER .

Fig 2: Checking Evenness Of Cylinder Head Lower Face (Transversal)
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 Repair Gasket (+REP)

Courtesy of BMW OF NORTH AMERICA, INC.