11 37 020 Removing and installing/replacing servomotor for eccentric shaft (N20, N26)

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Special tools required:

11 7 170

WARNING: The preloading on the throttle return springs increases as the rotation on the worm gear increases. Danger of injury!
The eccentric shaft may only be twisted on the mounting flats for protection.
Risk of damage to the eccentric shaft gearing and to the servomotor worm drive.
The eccentric shaft must not spring back to the minimum stroke stop. Risk of damage!

Necessary preliminary work:

Remove CYLINDER HEAD COVER .
Remove IGNITION COIL AND INJECTOR SHAFTS .

WARNING: Heed stop installation instructions.

The eccentric shaft on the mounting flats (1) must only be turned with an open-end spanner (2) for support.

The eccentric shaft has mounting flats on both sides ; if the engine is installed, the front mounting flat must be used.

Heed the following work instructions.

After the engine stops, the eccentric shaft is in the maximum stroke position.

If the actuator drive is defective, the eccentric shaft is located in an undetermined position.

Fig 1: Turning Eccentric Shaft On Mounting Flats With Open-End Spanner

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Release screw (1) at oil spray nozzle (2).

Tightening torque: 11 37 4AZ .

Unclip oil spray nozzle (2) from the bracket on the actuator drive (3) in direction of arrow.

Fig 2: Removing Oil Spray Nozzle From Bracket On Actuator Drive

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Turn 4-mm hexagon socket wrench (2) clockwise (maximum stroke).

Secure eccentric shaft (1) with open-end spanner (3) for support.

Fix eccentric shaft with an open-end spanner (3) (kickback danger)

Fig 3: Adjusting Eccentric Shaft Using Hexagon Socket Wrench And Open-End Spanner

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Position eccentric shaft in the middle between maximum stroke and minimum stroke.

Secure eccentric shaft (1) with special tool 11 7 170 .

The open-end spanner can now be removed.

Fig 4: Securing Eccentric Shaft With Special Tool (11 7 170)

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Remove minimum stroke stop (1).

Stop (2) of maximum stroke must remain in place for support of the intermediate shaft.

Tightening torque: 11 37 5AZ .

Fig 5: Maximum Stroke Limit Position

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Slowly adjust eccentric shaft to minimum stroke via servomotor using 4-mm hexagon socket wrench (2) and open-end spanner (3).

IMPORTANT: Secure eccentric shaft with an open-end spanner (1) (kick-back danger)

Release gearing of the eccentric shaft from worm drive.

Fig 6: Adjusting Eccentric Shaft Using Hexagon Socket Wrench And Open-End Spanner

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IMPORTANT: Eccentric shaft (2) is no longer connected to the worm drive of the servomotor in this working position.

Fig 7: Turning Eccentric Shaft On Mounting Flats With Open-End Spanner

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Turn eccentric shaft (2) approximately 90° further with an open-end spanner (1).

Secure eccentric shaft (2) against kickback with the assistance of a second person.

Graphic N55.

Position stop (1) of eccentric shaft at stop of maximum stroke.

Fig 8: Positioning Stop Of Eccentric Shaft

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Screw in stop (1) for minimum stroke.

Tightening torque: 11 37 5AZ .

Installation note:

The eccentric shaft is now secured and can no longer kick back.

Fig 9: Minimum Stroke Stop

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Release screws (1).

Fig 10: Screws

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Turn servomotor (1) in direction of arrow and remove upwards.

Installation note:

Clean blind holes with compressed air.

The gearing of the worm gear and the eccentric shaft must be greased with LONGTIME PD 1 (4.1) .

Fig 11: Turning Servomotor

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Insert bolts (1).

Tightening torque: 11 37 3AZ .

Installation note:

Eccentric shaft and worm drive must now be joined.

Fig 12: Bolts

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Release stop (1) of minimum stroke of eccentric shaft.

Tightening torque: 11 37 5AZ .

IMPORTANT: Secure eccentric shaft with an open-end spanner (kickback danger)

Fig 13: Minimum Stroke Stop

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Installation note:

Carefully mate eccentric shaft gear in the worm shaft of the servomotor by turning the actuator drive.

Fix eccentric shaft with an open-end spanner (3) for support and secure (kickback danger).

Centrally clamp the eccentric shaft with a 4-mm hexagon socket wrench (2) at the servomotor.

Fig 14: Adjusting Eccentric Shaft Using Hexagon Socket Wrench And Open-End Spanner

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Secure eccentric shaft (1) with special tool 11 7 170 .

Fig 15: Securing Eccentric Shaft With Special Tool (11 7 170)

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Screw in stop (1) for minimum stroke.

Tightening torque: 11 37 5AZ .

Fig 16: Maximum Stroke Limit Position

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Slowly adjust eccentric shaft (1) to maximum stroke via servomotor using 4-mm hexagon socket wrench (2) and open-end spanner (3).

IMPORTANT: Merely secure eccentric shaft with an open-end spanner (1).

Fig 17: Adjusting Eccentric Shaft Using Hexagon Socket Wrench And Open-End Spanner

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Retract oil spray nozzle (2) on actuator drive (3).

Engage bolt (1) and release back to 90°.

For exact positioning of the oil spray nozzle (2) audibly clip it in at the top.

Secure oil spray nozzle (2) with screw (1).

Tightening torque: 11 37 4AZ .

Fig 18: Removing Oil Spray Nozzle From Bracket On Actuator Drive

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Remove all special tools.

Assemble engine.

Check function of DME.

Service function.
Drive.
Digital Motor Electronics
Valvetronic run-in procedure.