Cylinder head disassembled

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

NOTE: Maximum plane deviation: longitudinal 0.10 mm.

Fig 1: Checking Cylinder Head Sealing Face Evenness Using Standard Straightedge

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Maximum plane deviation: transversal 0.05 mm.

Machining limit: see HEAD/VALVES/GUIDES/BEARINGS TECHNICAL DATA and VALVE SEAT TECHNICAL DATA .

Fig 2: Checking Cylinder Head Maximum Plane Deviation Using Standard Straightedge

Courtesy of BMW OF NORTH AMERICA, INC.

A cylinder head gasket (+REP) 0.3 mm thicker than usual can be obtained for machined (resurfaced) cylinder heads.

Fig 3: Identifying Gasket (+REP)

Courtesy of BMW OF NORTH AMERICA, INC.