Milling cylinder head sealing surface (B48 and B46 engine) (Cooper S and John Cooper Works)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2021 MINI Cooper, 2020 MINI Cooper, 2019 MINI Cooper, 2018 MINI Cooper, and 2017 MINI Cooper. However, it is still accessible from the selected car via links, so may be relevant.

Preliminary work needed:

Remove CYLINDER HEAD .
Check CYLINDER HEAD FOR WATERTIGHTNESS .

Check evenness of cylinder head sealing surface with a standard straightedge (1).

NOTE: Max. deviation from flatness (longitudinal) 0.10 mm

Courtesy of BMW OF NORTH AMERICA, INC.

Check evenness of cylinder head sealing surface with a standard straightedge (1).

NOTE: Max. deviation from flatness (transverse) 0.05 mm

Courtesy of BMW OF NORTH AMERICA, INC.

Required follow-up work:

Install the CYLINDER HEAD .