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: 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: Positioning Special Tool (11 9 007) On Cylinder Head

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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: Placing Individual Components Into Special Tool (11 8 840)

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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: Identifying Valve Key

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Incorrect installation will result in valve spring breakage.

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
Fig 7: Identifying Valve Spring Color Mark
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Colors for discharge valves:

• Green/white
• Yellow/white

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: Exploded View Of Intake Valve

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Assemble engine.

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