11 41 000 Removing and Installing/Replacing Oil Pump (N55) (as of production date March 2012)

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Special Tools Required:

2 303 793 .

IMPORTANT: Aluminum Screws/Bolts Must Be Replaced Each Time They Are Released .
Aluminum Screws/Bolts Are Permitted with and Without Color Coding (Blue).
for Reliable Identification:
Aluminum Screws/Bolts Are Not Magnetic .
Joining Torque and Angle of Rotation Must Be Observed Without Fail (Risk of Damage) .

Necessary Preliminary Tasks:

Remove OIL SUMP .
Remove SEALING CAP of Vacuum Pump.
Remove SEALING CAP of Chain Tensioner for Oil Pump.

Undo All The Aluminum Screws (1) Along The Line.

Installation Note:

Replace Aluminum Screws.

Remove Intake Pipe with Oil Deflector.

Installation Note:

Replace O-Ring.

Fig 1: Removing Screws

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IMPORTANT: Before Releasing The Central Bolt On The Oil Pump, The Hydraulic Chain Tensioner Must Be Drained.

Carefully Press Tensioning Rail (1) with A Suitable Screwdriver (2) In Direction of Arrow.

As The Oil Pressure In The Chain Tensioner Can Only Be Drained Pulsating, The Tensioning Rail (1) Must Be Pressed Several Times.

Fig 2: Pressing Tensioning Rail Using Suitable Screwdriver

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Press The Tensioning Rail (1) and Hold Down.

Fix Chain Tensioner Piston In Position with A Suitable Lock Pin (2).

Tightening torque: 11 41 7AZ .

Fig 3: Pressing Tensioning Rail and Securing Chain Tensioner In Position with Lock Pin

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NOTE: Sprocket Must Be Blocked In Order To Release Central Bolt (1).

Secure Special Tool 2 303 793 To Crankcase.

Release Oil Pump Central Bolt (1).

Tightening torque 11 41 5AZ .

Fig 4: Releasing Oil Pump Central Bolt Using Special Tool

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Release Aluminum Screws (1).

Tightening torque 11 41 6AZ .

Installation Note:

Replace Aluminum Screws.

Watch Mounting Flats On Oil Pump Sprocket.

Fig 5: Identifying Oil Pump Drive Gear and Aluminum Screws

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IMPORTANT: Observe Different Screw Lengths.

Release Aluminum Screws (1).

Tightening torque 11 41 2AZ .

Installation Note:

Replace Aluminum Screws.

Fig 6: Identifying Aluminum Screws

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Detach Sprocket (1) In Direction of Arrow.

NOTE: Chain Tensioner Presses Timing Chain (3) Upwards.

Do Not Remove Sprocket (1).

Remove Oil Pump (2) In Direction of Arrow.

Fig 7: Detaching Sprocket and Removing Oil Pump

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Installation Note:

Check Spacer Bushes for Secure Seating and Damage; Replace If Necessary.

Fig 8: Locating Spacer Bushes

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Install Oil Pump (2).

Align Mounting Flats (3) On Oil Pump (2) To Sprocket (4).

Fig 9: Identifying Oil Pump, Twin Surface, and Spacer Bushings

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Install Intake Pipe with Oil Deflector.

Installation Note:

Replace O-Ring.

Insert All The Aluminum Screws (1) Along The Line.

Installation Note:

Replace Aluminum Screws.

Tightening torque 11 41 1AZ .

Fig 10: Identifying Aluminum Screws

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Assemble Engine.