11 12 719 Grinding cylinder head sealing surface (N63)

WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary work

Remove 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 Evenness Of Cylinder Head Lower Face Using Standard Straightedge (Longitudinal)

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 Evenness Of Cylinder Head Lower Face Using Standard Straightedge (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 Gasket (+REP)

Courtesy of BMW OF NORTH AMERICA, INC.