11 31 051 Replacing timing chain (N52)

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: Identifying Fastener Directions

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

Fig 2: Identifying Special Tool (11 0 300)

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Do not remove special tool 11 4 280.

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

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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 11 21 CRANKSHAFT AND BEARINGS (N52) .

Remove central bolt with hub towards front.

Fig 4: Identifying 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 (N52) .

Fig 5: Identifying Engine Plug

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Open plug (1).

For tightening torque refer to 11 31 6AZ in 11 31 CAMSHAFT (N52) .

Fig 6: Identifying Engine 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 (N52) .

Fig 7: Identifying Screw On Chain Drive At Top

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Release screw (1) on chain drive at bottom.

For tightening torque refer to 11 31 3AZ in 11 31 CAMSHAFT (N52) .

Fig 8: Identifying Screw On Chain Drive At Bottom

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Remove both adjusting units.

Release screws (1).

For tightening torque refer to 11 31 2AZ in 11 31 CAMSHAFT (N52) .

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

Fig 9: Identifying Timing Chain Module Screw

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Fig 10: Identifying Collar On 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 keep timing chain tensioned; it is possible for timing chain (1) to jam on chain module (3).

Fig 11: Identifying 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).

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

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Remove belt tensioner.

Screw in special tool 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 (1) to jointing torque.

For tightening torque refer to 11 21 1AZ in 11 21 CRANKSHAFT AND BEARINGS (N52) .

Mark central bolt and hub with paint.

Fig 13: Identifying Special Tool (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: Identifying Torsion Angle

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Tighten central bolt with two persons.

For tightening torque refer to 11 21 1AZ. in 11 21 CRANKSHAFT AND BEARINGS (N52)

Install both Adjusting Units. 

Install Chain Tensioner. 

Fig 15: Identifying Special Tools (11 9 280), (11 5 200), (11 4 360) And (11 0 300)

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Crank engine twice.

Check Timing. 

Assemble engine.