11 41 010 Removing and Installing/Replacing Chain Module for Oil Pump/Vacuum Pump (N55) (as of production date March 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 .
Joining Torque and Angle of Rotation Must Be Observed Without Fail (Risk of Damage) .

Necessary Preliminary Tasks:

Remove CYLINDER HEAD COVER .
Remove All SPARK PLUGS .
Remove OIL SUMP .
Remove DRIVE BELT .
Remove TENSIONING DEVICE for Drive Belt.
Remove VIBRATION DAMPER .
Remove SEALING COVER for Vacuum Pump.
SEALING CAP for Oil Pump Chain Tensioner.
Remove CHAIN TENSIONER .
Remove TIMING CHAIN (FROM MARCH 2012) .

Screw In Special Tool 11 8 650 On Screw Connection of Belt Tensioner On Crankcase.

Turn Sprocket with Central Bolt At Crankshaft Into Position Until Special Tool 11 0 290 Can Be Secured.

Simultaneously Secure Special Tool 11 0 290 To Sprocket and Special Tool 11 8 650 .

Release Screw (1) for Sprocket.

Tightening torque 11 66 2AZ .

Fig 1: Releasing Sprocket Screw Using Special Tools

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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).

Release Screws (3).

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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Remove Fastener (1) In Direction of Arrow.

Fig 5: Removing Fastener

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Position Flywheel (1) In TDC Setting Using Special Tool 11 0 300 .

Fig 6: Positioning Flywheel In TDC Setting Using Special Tool

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Release Aluminum Screws (1).

Remove Oil Pump Drive Gear From The Drive Shaft.

Fig 7: Identifying Oil Pump Drive Gear and Aluminum Screws

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Open Screw Plug (1).

Tightening torque: 11 11 9AZ .

Installation Note:

Replace Sealing Ring.

Fig 8: Locating Screw Plug

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Lock Flywheel (1) with Special Tool 11 9 260 .

Fig 9: Blocking Crankshaft Using Special Tool 11 9 260

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IMPORTANT: Do Not Remove Special Tools 11 0 300 and 11 4 280 To Release Central Bolt (1).

Release Central Bolt (1).

Installation Note:

Release Central Bolt (1) with 3/4 Tool (2).

Breakaway Torque Approx. 500 Nm.

Fig 10: Removing Central Bolt Using 3/4-Inch Tool

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Screw In Two Screws (1) and Remove Hub (2) In Direction of Arrow.

Installation Note:

Replace CRANKSHAFT SEAL At Front.

Fig 11: Moving Vibration Absorber Screws and Hub

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Release Aluminum Screw (1) with Special Tool 11 8 640 .

Fig 12: Locating Aluminum Screw

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Remove Chain Module (1) In Direction of Arrow.

Fig 13: Identifying Chain Module

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IMPORTANT: Note Installation Direction of Sprocket (2).
Collar (See Arrow In Illustration) On Sprocket (2) Points To Engine .
Incorrect Assembly Will Result In Engine Damage .

Fig 14: Locating Collar On Camshaft Sprocket

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Insert Chain Module.

Secure Aluminum Screw (1) with Special Tool 11 8 640 .

Tightening torque: 11 41 3AZ .

Fig 15: Locating Aluminum Screw

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Insert Aluminum Screws (1) for Chain Module.

Tightening torque 11 41 6AZ .

Installation Note:

Replace Aluminum Screws.

Pay Attention To Mounting Flats On Oil Pump Drive.

Fig 16: Identifying Oil Pump Drive Gear and Aluminum Screws

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Position Module (1) for Oil Pump Drive.

Position Module (2) for Camshaft Drive.

Insert Hub (3) for Vibration Absorber with Grip Disc.

Fig 17: Inserting Hub for Vibration Absorber with Grip Disc

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Fit Central Bolt (1).

Secure Central Bolt with Special Tool 1 00 9 140 .

Tightening torque 11 21 1AZ .

Installation Note:

Replace CRANKSHAFT SEAL At Front.

Fig 18: Tightening Central Bolt

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Assemble Engine.