11 31 051 Replacing timing chain (N51)

Special tools required: 

• 11 0 300
• 11 4 280
• 11 4 360
• 11 4 362
• 11 5 200
• 11 9 280

Necessary preliminary tasks: 

• Remove Cylinder Head Cover 
• Remove all Spark Plugs
• Remove Chain Tensioner. 
• Remove Radial Shaft Seal  at front.
• Remove Belt Tensioner 
• Remove Vibration Damper 

Remove fastener (1) in direction of arrow.

Installation: 

Install fastener (1) with bore facing outwards.

Fig 1: Fastener And Removal Direction

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Secure crankshaft during entire repair operation with special tool 11 0 300.

Fig 2: Special Tool (11 0 300)

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Do not remove special tool 11 4 280.

Fig 3: Special Tool (11 4 281), (11 4 282) And (11 4 283)

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Mount special tool 11 9 280 on hub for vibration damper.

Release central bolt (1).

For tightening torque refer to 11 21 1AZ in 21 CRANKSHAFT WITH BEARINGS .

Remove central bolt with hub towards front.

Fig 4: Special Tool (11 9 280) And Central Bolt

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Open plug (1).

For tightening torque refer to 11 31 6AZ in 11 31 CAMSHAFT .

Fig 5: Plug

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Open plug (1).

For tightening torque refer to 11 11 6AZ in 11 11 CRANKCASE .

Fig 6: Plug

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Release screw (1) on chain drive at top.

For tightening torque refer to 11 31 2AZ in 11 31 CAMSHAFT .

Fig 7: Bearing Pin

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Release screw (1) on chain drive at bottom.

For tightening torque refer to 11 31 3AZ in 11 31 CAMSHAFT .

Fig 8: Crankcase Bearing Pin

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Remove both Adjusting Units 

Release screws (1).

For tightening torque refer to 11 31 2AZ in 11 31 CAMSHAFT .

Remove chain module with timing chain and sprocket wheel upwards in direction of arrow.

Fig 9: Timing Chain Module Bolts

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Fig 10: Sprocket Wheel

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Pull timing chain (1) upwards until sprocket wheel (2) engages chain guide (3).

Install timing chain (1) and sprocket wheel (2) in this position.

Installation: 

Always hold timing chain (1) under tension. Timing chain (1) may jam on chain guide (3).

Fig 11: Timing Chain, Sprocket Wheel And Chain Guide

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Install hub with central bolt.

Tighten down special tool 11 5 200 with screws (1) to hub.

Fig 12: Special Tool (11 5 200) And Hub Screws

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Remove Belt Tensioner .

Screw in special tool 11 4 362 from special tool kit 11 4 360.

Mount special tool 11 9 280 on 11 5 200.

Support special tool 11 9 280 on special tool 11 4 362.

Special tool 11 0 300 secures crankshaft.

Tighten central bolt to jointing torque.

For tightening torque refer to 11 21 1AZ in 21 CRANKSHAFT WITH BEARINGS .

Mark central bolt and hub with paint.

Fig 13: Special Tools (11 9 280), (11 5 200). 11 4 360) And (11 0 300)

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Apply stroke of paint (1) for torsion angle tightening to tool.

See Fig 14.

Fig 14: Special Tools With Colored Line

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Tighten central bolt with two persons.

For tightening torque refer to 11 21 1AZ in 21 CRANKSHAFT WITH BEARINGS .

Install both Adjusting Units. .

Install Chain Tensioner .

Fig 15: Identifying Special Tool (11 9 280), (11 5 200) And (11 0 300)

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Crank engine twice.

Check Timing. 

Assemble engine.