11 37 550 Removing and installing/replacing a Valvetronic torsion spring (N63)

Special tools required:

Necessary preliminary tasks:

Remove the engine with front axle.
Remove cylinder head cover. See REMOVING LEFT CYLINDER HEAD COVER or REMOVING RIGHT CYLINDER HEAD COVER .

IMPORTANT: Danger of injury!
Safety goggles and protective gloves required.

Twist engine at central bolt so that it is suitable for dismantling.

Position intake camshaft (2) horizontally (see arrow).

Set intermediate shaft (1) to zero lift (see arrow).

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)

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IMPORTANT: The special tool is under preload.

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: Opening 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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IMPORTANT: Retaining plate must be positioned in engagement lugs on special tool 2 249 160 .

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: Attaching Both Ends Of Torsion Spring In Rollers Of Special Tool (2 249 160)

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Pretension torsion spring with special tool 2 249 160 .

Fig 7: Opening Special Tool (2 249 160)

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IMPORTANT: Special tool 2 249 160 must engage with rotary lever (1) in engagement groove so that torsion spring is securely pretensioned.

Fig 8: Identifying Rotary Lever In 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: Positioning Special Tool (2 249 160) With Torsion Spring On Cylinder Head

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

Fig 10: Removing Special Tool (2 249 160)

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Remove special tool.

Assemble engine.