11 34 715 Replacing all valve springs (N20)

Special tools required: 

• 11 4 481 .
• 11 4 482 .
• 11 8 840 .
• 11 9 000 .
• 11 9 007 .

Necessary preliminary tasks: 

• Remove CYLINDER HEAD .
• Remove EXHAUST CAMSHAFT .
• Remove INTERMEDIATE LEVER .
• Remove INTAKE CAMSHAFT .
• Remove ROCKER ARM .

Place cylinder head on special tool 11 9 000 .

Align special tool 11 9 007 on particular combustion chamber.

Fig 1: Aligning Special Tool 11 9 007 On Combustion Chamber

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Position special tool 11 9 007 on cylinder head.

Push locks (1) and (2) toward inside and pre-load via eccentric shaft.

Fig 2: Pushing Locks Toward Inside

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Press down valve springs  with special tool 11 8 840 .

Fig 3: Pressing-Down Valve Springs

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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 .

Fig 4: Removing Valve Key

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Valve springs are marked in color (1).

Colors for intake valves:

• Green/blue
• Yellow/Blue

Colors for discharge valves:

• Green/white
• Yellow/white
  Fig 5: Identifying Color Marking On Valve Spring

  Courtesy of BMW OF NORTH AMERICA, INC.

Install the valve spring so that the larger diameter (X) 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 6: Exploded View Of Intake Valve

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Assemble engine.

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