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

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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 .
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.
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 Intake Pipe With Oil Deflector

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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: Securing Chain Tensioner Using 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: 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 5: 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 6: 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 7: 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: 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 10: Identifying Oil Pump Aluminum Screws

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Assemble engine.