11 41 000 Removing and installing/replacing oil pump (N55) - up to 03.2012

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Special tools required:

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 .
Jointing torque and angle of rotation must be observed without fail (risk of damage) .

Necessary preliminary tasks:

Removing oil sump . See REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (N55, RWD) or REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (N55, AWD) .
Remove SEALING CAP of vacuum 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 Intake Pipe With Oil Deflector

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Press timing chain with chain tensioner (1) in direction of arrow.

Disconnect timing chain with special tool 11 4 120 .

Feed out camshaft sprocket (3) at hexagon head (4) of vacuum pump.

Installation note:

If the chain module is replaced, a mounting bar (2) is already pre-installed.

Fig 2: Pressing Timing Chain With Chain Tensioner

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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 3: Securing Special Tool 2 303 793 Onto Crankcase

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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 4: Locating Chain Module 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 5: Identifying Oil Pump 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 6: Removing Oil Pump

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Installation note:

Check spacer bushes for secure seating and damage; replace if necessary.

Fig 7: Locating Spacer Bushes

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Install oil pump (2).

Align mounting flats (3) on oil pump (2) to sprocket (4).

Fig 8: Installing Oil Pump

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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 9: Identifying Oil Pump Aluminum Screws

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Assemble engine.