11 34 552 Removing and installing or replacing all valves (B48, B46)

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Special tools required:

11 4 480

Necessary preliminary tasks:

Remove CYLINDER HEAD .
Remove EXHAUST CAMSHAFT .
Remove INTAKE CAMSHAFT
Remove ROCKER ARMS
Remove VALVE SPRINGS
Remove VALVE STEM SEALS

Arrangement:

Valve
Valve stem seal with spring cup, bottom
Valve spring
Top spring cup
Valve keys

Fig 1: Valve, Valve Stem Seal, Valve Spring, Top Spring Cup And Valve Keys

Courtesy of BMW OF NORTH AMERICA, INC.

If the valves are to be reused, set them down in special tool 11 4 480 in a tidy and orderly fashion.