11 31 051 Replacing timing chain (N52)

Special tools required: 

• 00 9 140 .
• 11 0 300 .
• 11 4 280 .
• 11 4 281 .
• 11 4 282 .
• 11 4 283 .
• 11 4 360 .
• 11 4 362 .
• 11 5 200 .
• 11 9 280 .

Necessary preliminary work: 

• Remove CYLINDER HEAD COVER .
• Remove all SPARK PLUGS .
• Remove CHAIN TENSIONER .
• Remove CRANKSHAFT SEAL at front
• Remove drive belt TENSIONER .
• Remove VIBRATION DAMPER .

Remove fastener (1) in direction of arrow.

Installation note: 

Install fastener (1) with bore hole facing outwards.

Fig 1: Removing Fastener

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Rotate crankshaft at central bolt into TDC position.

Slide special tool 11 0 300 in direction of arrow into dowel hole and secure crankshaft.

Fig 2: Securing Crankshaft Using Special Tool (11 0 300)

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If the flywheel is secured in the correct dowel hole with special tool 11 0 300 , the engine can no longer be moved at the central bolt.

Screw special tool 11 9 280 onto hub of vibration damper.

Release central screw (1).

Tightening torque 11 21 1AZ .

Remove hub towards front.

Fig 3: Releasing Central Screw

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Open plug (1).

Tightening torque 11 31 5AZ .

Fig 4: Identifying Screw Plug

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Open plug (1).

Tightening torque 11 11 7AZ .

Installation note: 

Replace aluminum screws  .

Fig 5: Identifying Screw Plug

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Release bearing pin (1) from timing chain module on cylinder head.

Tightening torque 11 31 5AZ .

Fig 6: Identifying Bearing Journal

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Release bearing pin (1) from timing chain module on crankcase.

Tightening torque 11 31 4AZ .

Fig 7: Identifying Bearing Journal

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Secure special tool 11 4 283 with bolts (1) to cylinder head.

Fig 8: Fitting Special Tools

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Mount special tool 11 4 281 on intake and exhaust camshafts.

Do not remove special tool 11 4 280 .

Remove INTAKE AND EXHAUST CAMSHAFT ADJUSTERS .

Release bolts (1) from timing chain module on cylinder head.

Tightening torque 11 31 3AZ .

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

Fig 9: Identifying Timing Chain Module Bolts

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Fig 10: Identifying 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 camshaft sprocket (2) in this position.

Installation note: 

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

Fig 11: Identifying Timing Chain, Camshaft Sprocket, 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: Identifying Special Tool (11 5 200) And Screws

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Remove TENSIONER  for drive belt.

Screw in special tool 11 4 362 from special tool set 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 joining torque.

Tightening torque 11 21 1AZ .

Mark central bolt and hub with paint.

Fig 13: Tightening Central Bolt

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Mark special tools with colored line (1). See Fig 14.

Fig 14: Marking Special Tools With Colored Line

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If necessary, tighten central bolt to angle of rotation with special tool 00 9 140 .

Tightening torque 11 21 1AZ .

Tighten central bolt with a second person helping.

Tightening torque 11 21 1AZ .

Install INTAKE AND EXHAUST CAMSHAFT ADJUSTERS .

Install CHAIN TENSIONER .

Fig 15: Tightening Central Bolt

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Crank engine twice.

Check TIMING .

If necessary, adjust VALVE TIMING .

Assemble engine.