11 34 552 Removing And Installing/Replacing All Valves (N62)

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 removed)

Preliminary tasks are described in Disassembling and assembling cylinder head, refer to 11 12 503 DISASSEMBLING AND ASSEMBLING CYLINDER HEAD (N62/N62TU) .

Remove valve springs, refer to 11 34 715 REPLACING ALL VALVE SPRINGS (N62) .

Remove valve stem seals, refer to 11 34 560 REPLACING ALL VALVE STEM SEALS (N62) .

Remove valves from cylinder head.

Installation:

If necessary, check valve guide for wear, refer to 11 12 595 CHECKING A VALVE GUIDE FOR WEAR (N62) .

If necessary, remachine valve seat, refer to 11 12 527 REMACHINING A VALVE SEAT - CYLINDER HEAD DISASSEMBLED (N62) .

IMPORTANT: Incorrect installation possible. Valve springs of exhaust and inlet camshafts are different. Incorrect installation will result in engine damage.

NOTE: Valve springs for exhaust valves are approx. 4 mm longer.

Valve springs of inlet valves
Valve springs of exhaust valves

Fig 1: Identifying Difference Between Dimensions Of Inlet And Exhaust valves
Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Incorrect installation possible. Incorrect installation will result in valve spring breakage. Color marking (1) is normally on lower end of valve spring. Only the diameter is decisive for the correct installation of the valve springs. Install valve spring so that larger diameter points to spring plate at bottom.

Fig 2: Identifying Color Marking On Lower End Of Valve Spring

Courtesy of BMW OF NORTH AMERICA, INC.

Arrangement:

Fig 3: Identifying Arrangement Of valve

Courtesy of BMW OF NORTH AMERICA, INC.