11 34 715 Replacing all valve springs (N55)

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 .

Place cylinder head on special tool 11 9 000 .

Align special tool 11 9 007 on particular combustion chamber.

Fig 1: Placing Cylinder Head On Special Tool (11 9 000) And 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 preload via eccentric shaft.

Fig 2: Identifying Locks

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Press down intake valve  with special tool 11 8 841.

Fig 3: Pressing Down Intake Valve Using Special Tool (11 8 841)

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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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Press down discharge valve  with special tool 11 8 842.

Fig 5: Pressing Down Discharge Valve Using Special Tool (11 8 842)

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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 4 482 .

Fig 6: Removing Valve Key

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Risk of mixing up the valve springs for the inlet and exhaust valves.

Valve springs are marked in color (1).

Colors for intake valves:

• Green/blue
• Yellow/Blue

Colors for discharge valves:

• Green/white
• Yellow/white

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

Fig 7: Identifying Correct Installation Position Of Valve Spring

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Arrangement:

1. Valve
2. Valve stem seal with lower spring cup
3. Valve spring
4. Upper spring cup
5. Valve keys
   Fig 8: Exploded View Of Valve

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Assemble engine.

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