11 37 550 Removing and Installing/Replacing A Valvetronic Torsion Spring (N63O1)

Special Tools Required: 

• 2 249 160 .
• 11 4 480 .

Necessary Preliminary Tasks: 

• Remove The Engine with FRONT AXLE .
• Remove Cylinder Head Cover. See LEFT CYLINDER HEAD COVER or RIGHT CYLINDER HEAD COVER .

Twist Engine At Central Bolt So That It Is Suitable for Dismantling.

Position Intake Camshaft (2) Horizontally (See Arrow In Illustration).

Set Intermediate Shaft (1) To Zero Lift (See Arrow In Illustration).

Fig 1: Positioning Intake Camshaft Horizontally and Setting Intermediate Shaft To Zero Lift

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Release Screw of Torsion Spring.

Remove Special Tool 2 249 160 with Torsion Spring.

Clamp Special Tool 2 249 160 In Vice.

Fig 2: Removing Special Tool (2 249 160) and Clamping In Vice

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Operating Lever Must Be Pretensioned In Direction of Arrow So That Special Tool 2 249 160 Can Be Opened.

Relieve Tension On Special Tool 2 249 160 .

Remove Torsion Spring From Special Tool 2 249 160 and Place On Special Tool 11 4 480 In An Orderly Fashion.

Fig 3: Relieving Tension On Special Tool (2 249 160)

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Installation Note: 

Engage Torsion Spring (1) On Special Tool 2 249 160 .

Fig 4: Engaging Torsion Spring On Special Tool (2 249 160)

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Fig 5: Inserting Torsion Spring On Special Tool (2 249 160)

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Attach Both Ends of Torsion Spring In The Rollers of Special Tool 2 249 160 .

Fig 6: Attaching Both Ends of Torsion Spring In Rollers of Using Special Tool

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Pretension Torsion Spring with Special Tool 2 249 160 .

Fig 7: Relieving Tension Torsion Spring Using Special Tool

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Fig 8: Identifying Special Tool Rotary Lever

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Position Special Tool 2 249 160 with Torsion Spring On Cylinder Head.

Secure Torsion Spring.

Tightening torque: 11 37 3AZ .

Fig 9: Fitting Special Tool (2 249 160) To Cylinder Head

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Unlock Locking Button (1) On Special Tool 2 249 160 and Release In Direction of Arrow.

Fig 10: Position Special Tool with Torsion Spring On Cylinder Head

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Remove Special Tool.

Assemble Engine.