11 41 000 Removing and installing/replacing oil pump (N55) from March 2012

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 for oil pump chain tensioner.

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: Identifying 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.

Fig 2: Pressing Tensioning Rail Using Screwdriver

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As the oil pressure in the chain tensioner can only be drained pulsating, the tensioning rail (1) must be pressed several times.

Fig 3: Identifying Tensioning Rail And Lock Pin

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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 4: Releasing Oil Pump Central Bolt

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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 .

Release aluminum screws (1).

Tightening torque 11 41 6AZ .

Fig 5: Locating Aluminum Screws

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Installation note:

Replace aluminum screws.

Watch mounting flats on oil pump sprocket.

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, Spacer Bushings And Twin Surface

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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 .

Assemble engine.

Fig 10: Identifying Aluminum Screws

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