11 34 552 Removing and installing or replacing all valves (N12)

Special tools required: 

• 11 4 480

Necessary preliminary tasks: 

• Remove cylinder head  . 
• Remove intermediate lever  . 
• Remove eccentric shaft.  
• Remove inlet camshaft.  
• Remove exhaust camshaft.  
• Remove roller cam follower.  
• Remove valve springs.  
• Remove valve stem seals.  

Arrangement:

1. Valve
2. Valve stem seal with spring plate, bottom
3. Valve spring
4. Top plate spring
5. Valve tapers

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

Fig 1: Identifying Top Plate Spring, Valve Tapers, Valve Spring And Valve

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Check function of DME; if necessary, readjust uniform mixture distribution.