11 34 715 Replacing all valve springs (N55 hybrid)

Special tools required: 

• 11 4 481
• 11 4 482
• 11 8 841
• 11 8 842
• 11 9 000
• 11 9 007

Necessary preliminary work: 

• Remove CYLINDER HEAD .
• Remove EXHAUST CAMSHAFT .
• Remove INTERMEDIATE LEVER .
• Remove INTAKE CAMSHAFT .
• Remove rocker arm. See 11 33 050 REMOVING AND INSTALLING/REPLACING ALL ROCKER ARMS (N55 HYBRID) .

Place cylinder head on special tool 11 9 000 .

Align special tool 11 9 007 on particular combustion chamber.

Position special tool 11 9 007 on cylinder head.

Push locks (1 and 2) toward inside and preload via eccentric shaft.

Press down intake valve with special tool 11 8 841.

Remove valve key (1) with a magnet.

Remove valve spring with spring cups.

If individual components are to be reused, they must be placed in neat order in special tool 11 4 481 .

Press down discharge valve with special tool 11 8 842.

Remove valve key (1) with a magnet.

Remove valve spring with spring cups.

If individual components are to be reused, they must be placed in neat order in special tool 11 4 482 .

Valve springs are marked in color (1).

Colors for intake valves:

• Green/blue
• Yellow/Blue

Colors for discharge valves:

• Green/white
• Yellow/white
  Fig 7: Identifying Valve Spring Dimensions

  Courtesy of BMW OF NORTH AMERICA, INC.

Install the valve spring so that the larger diameter points to the lower spring cup.

Arrangement:

1. Valve
2. Valve stem seal with lower spring cup
3. Valve spring
4. Upper spring cup
5. Valve keys
   Fig 8: Identifying Valve, Valve Stem Seal, Valve Spring, Top Spring Cup And Valve Keys

   Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

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