11 31 051 Replacing timing chain (N55) up to March 2012

Special tools required:

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER .
Remove all SPARK PLUGS .
Remove CRANKSHAFT SEAL at front
Remove TENSIONING DEVICE for drive belt.
Remove VIBRATION DAMPER .
Check TIMING .
Remove SEALING CAP for vacuum pump

Engine removed

Block crankshaft with special tool 11 9 260 .

IMPORTANT: To release central bolt (1), remove special tool 11 0 300 .

Fig 1: Removing Special Tool 11 0 300

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IMPORTANT: When central bolt of crankshaft is released, there is no longer a secure connection to timing drive.

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

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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: Attaching Special Tool 11 8 180 To Manual With Existing Transmission Bolts

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IMPORTANT: Before releasing the central bolt, the chain tensioner must be relieved of tension.

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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IMPORTANT: Breakaway torque of the central bolt > 600 Newton meters
A 3/4-inch tool (large powered square) is required to release central bolt.

Release central bolt (1) with 3/4-inch tool (2).

Tightening torque 11 21 1AZ .

Fig 6: Releasing Central Bolt With 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 Hub On Crankshaft Forward

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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 .

Installation note:

Replace aluminium screws.

Fig 9: Identifying Screw Plug

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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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IMPORTANT: Install special tool 11 4 280 to release the central bolts on the intake and exhaust camshaft adjusters.

Remove INTAKE AND EXHAUST CAMSHAFT ADJUSTERS .

Fig 11: Install Special Tool 11 4 280 To 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.

NOTE: Graphic N52.

Fig 13: Removing Chain Module With Timing Chain

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IMPORTANT: Note direction of installation of camshaft sprocket (2).
Collar (see arrow in illustration) on camshaft sprocket (2) points to engine .
Incorrect assembly will result in engine damage .

Fig 14: Identifying 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: Pulling Timing Chain

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Insert central bolt (1) with hub for crankshaft.

Tighten down central bolt (1).

Tightening torque 11 21 1AZ .

Install INTAKE AND EXHAUST CAMSHAFT ADJUSTERS .

Install CHAIN TENSIONER .

Fig 16: Inserting Central Bolt With Hub For Crankshaft

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Crank engine twice.

Check TIMING .

If necessary, adjust VALVE TIMING .

Replace front CRANKSHAFT SEAL .

Assemble engine.