11 12 719 Milling Cylinder Head Sealing Surface (N62/N62TU)

WARNING: This page is about a different car, the 2005 BMW 645Ci and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.

(Cylinder head dismantled)

Check evenness of cylinder head sealing surface with a standard straight-edge (1).

NOTE: Maximum plane deviation: longitudinal 0.10 mm.

Fig 1: Checking Cylinder Head Longitudinal Plane Using Straight-Edge

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Maximum plane deviation: transversal 0.05 mm.

Machining limit, refer to ENGINE - TECHNICAL DATA - 645CI .

Fig 2: Checking Cylinder Head Transversal Plane Using Straight-Edge

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: A cylinder head seal 0.3 mm thicker than usual can be obtained for machined (milled) cylinder heads.

Fig 3: Identifying 0.3 mm Thicker Cylinder Head Seal

Courtesy of BMW OF NORTH AMERICA, INC.