11 31 051 Replacing Timing Chain (N55) (production date up to March 2012)

Special Tools Required: 

• 11 0 300 .
• 11 4 280 .
• 11 8 180 .
• 11 8 660 .
• 11 9 260 .
• 11 4 120 .

Necessary Preliminary Tasks: 

• Remove CYLINDER HEAD COVER .
• Remove All SPARK PLUGS .
• Remove CRANKSHAFT RADIAL SEAL At Front.
• Remove TENSIONING DEVICE  for Drive Belt.
• Remove VIBRATION DAMPER .
• Check TIMING .
• Remove SEALING COVER for Vacuum Pump.

Engine Removed 

Block Crankshaft with Special Tool 11 9 260 .

Fig 1: Blocking Crankshaft Using Special Tool 11 9 260

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Mark Position of Crankshaft Using A Colored Mark (1).

This Will Make Future Insertion of Special Tool 11 0 300 Easier.

Fig 2: Marking Position of Crankshaft Using Colored Mark

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Vehicles with Automatic Transmission 

Block Crankshaft with Special Tool 11 8 660 .

Fig 3: Blocking Crankshaft Using Special Tool 11 8 660 (Transmission Installed)

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Vehicles with Manual Gearbox 

Attach Special Tool 11 8 180 To Manual Transmission with Existing Transmission Bolts (1).

Block Crankshaft In Direction of Arrow with Special Tool.

Fig 4: Blocking Crankshaft In Direction of Arrow Using Special Tool

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Press Timing Chain with Chain Tensioner (1) In Direction of Arrow.

Disconnect Timing Chain with Special Tool 11 4 120 .

Fig 5: Pressing Timing Chain with Chain Tensioner

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

Tightening torque 11 21 1AZ .

Fig 6: Removing Central Bolt Using 3/4-Inch Tool

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Remove CHAIN TENSIONER .

Screw In Vibration Absorber Screws (1).

Move Hub (2) On Crankshaft Forward In Direction of Arrow To Remove.

Fig 7: Moving Vibration Absorber Screws and Hub

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Open Screw Plug (1).

Tightening torque 11 31 8AZ .

Fig 8: Identifying Screw Plug

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Open Screw Plug (1).

Tightening torque 11 11 7AZ .

Fig 9: Identifying Screw Plug

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Installation Note: 

Replace Aluminum Screws. 

Release Bearing Journal (1) From Timing Chain Module On Cylinder Head.

Tightening torque 11 31 6AZ .

Fig 10: Identifying Bearing Journal

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Remove INTAKING AND EXHAUST CAMSHAFT ADJUSTERS .

Fig 11: Removing Central Bolts On Intake and Exhaust Camshaft Adjusters

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Release Bearing Journal (1) From Timing Chain Module On Crankcase.

Tightening torque 11 31 5AZ .

Fig 12: Identifying Bearing Journal

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Release Bolts (1) From Timing Chain Module On Cylinder Head.

Tightening torque 11 31 4AZ .

Remove Chain Module with Timing Chain and Camshaft Sprocket Upwards In Direction of Arrow.

Fig 13: Identifying Timing Chain Module Bolts

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Fig 14: Locating Collar On Camshaft Sprocket

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Pull Timing Chain (1) Upwards Until Camshaft Sprocket (2) Engages Chain Guide (3).

Install Timing Chain (1) and Sprocket (2) In This Position.

Installation Note: 

Always Hold Timing Chain (1) Under Tension. Timing Chain (1) May Jam On Chain Guide (3).

Fig 15: Identifying Timing Chain, Camshaft Sprocket, and Chain Guide

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Insert Central Bolt (1) with Hub for Crankshaft.

Tighten Down Central Bolt (1).

Tightening torque 11 21 1AZ .

Install INTAKING AND EXHAUST CAMSHAFT ADJUSTERS .

Install CHAIN TENSIONER .

Fig 16: Tightening Central Bolt

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Crank Engine Twice.

Check TIMING .

If Necessary, Adjust VALVE TIMING .

Replace Front CRANKSHAFT SEAL .

Assemble Engine.