11 37 550 Removing and installing/replacing one Valvetronic torsion spring (S63T 0)

Special tools required: 

• 2 249 160
• 11 4 480

Necessary preliminary tasks: 

• Remove the engine with front axle. See 31 10 001 COMPLETELY REMOVING AND INSTALLING THE FRONT AXLE WITH ENGINE AND TRANSMISSION (S63T0, MANUAL GEARBOX) or 31 10 001 COMPLETELY REMOVING AND INSTALLING FRONT AXLE WITH ENGINE AND TRANSMISSION (S63T0, DKG) .
• Remove cylinder head cover. See 11 12 005 REMOVING AND INSTALLING/SEALING LEFT CYLINDER HEAD COVER (S63T 0) and 11 12 006 REMOVING AND INSTALLING/SEALING RIGHT CYLINDER HEAD COVER (S63T 0) .

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 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: Releasing Screw Of Torsion Spring

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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: Removing Torsion Spring From Special Tool 2 249 160

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Installation note: 

Engage torsion spring (1) on special tool 2 249 160 .

Fig 4: Connecting Torsion Spring On Special Tool 2 249 160

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Insert torsion spring (1) on special tool 2 249 160 and secure.

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: Locating Torsion Spring Ends

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Pretension torsion spring with special tool 2 249 160 .

Fig 7: Removing Torsion Spring Using Special Tool 2 249 160

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Fig 8: Locating Engagement Groove

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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 Onto Cylinder Head

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Unlock locking button (1) on special tool 2 249 160 and release in direction of arrow.

Fig 10: Releasing Screw Of Torsion Spring

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Remove special tool.

Assemble engine.