11 12 719 Grinding Cylinder Head Lower Face (N63O1)

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Necessary Preliminary Tasks:

Remove Cylinder Head. See LEFT CYLINDER HEAD or RIGHT 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

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Maximum Deviation From Flatness: Transversal 0.05 Mm.

Machining Limit: Refer To TECHNICAL DATA - CYLINDER HEAD WITH LID .

Fig 2: Checking Transversal Flatness
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 Thicker Cylinder Head Gasket (+Rep)

Courtesy of BMW OF NORTH AMERICA, INC.