11 31 051 Replacing timing chain (N18)

Special tools required:

IMPORTANT: Modified procedure for timing adjustment.
The timing is not determined at firing TDC of cylinder no. 1.
All pistons are in the 90° position.
Observe direction of rotation (direction of rotation always clockwise when viewed towards timing drive side).

Necessary preliminary work:

Remove CYLINDER HEAD COVER .
Remove all SPARK PLUGS .
Remove VIBRATION DAMPER .
Remove CHAIN TENSIONER .
Remove VANOS UNIT .
Remove PTFE RING at front.
Remove BELT TENSIONER .
Remove FRICTION GEAR .

Crankshaft is positioned with special tool 11 9 590 .

Do not remove special tool 11 9 590 during repair work.

Fig 1: Identifying Special Tool (11 9 590)

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Move front panel into WORKING POSITION .

Suspend engine with engine crane (1) from lifting eye (2).

Fig 2: Suspending Engine With Workshop Crane From Lifting Eye

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Remove ADAPTER PLATE .

Remove right ENGINE MOUNT .

Fig 3: Identifying Adapter Plate Bolts

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NOTE: Do not remove alternator.

Release upper ALTERNATOR BOLTS .

Secure special tool 11 9 630 with standard bolts (1 and 2).

Fig 4: Securing Special Tool (11 9 630) With Standard Bolts

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Do not remove special tool 11 7 440 .

Fig 5: Positioning Special Tool (11 7 440) On Intake And Exhaust Camshaft

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IMPORTANT: Employ a second person for gripping when releasing central bolt (1).

Fit special tool 11 9 280 on hub for vibration absorber with screws (2).

Release central bolt (1).

Fig 6: Fitting Special Tool (11 9 280) On Vibration Absorber Hub

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Release central bolt in direction of arrow.

Fig 7: Releasing Central Bolt

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Release bearing journal (1 and 2).

Tightening torque: 11 31 1AZ .

Fig 8: Identifying Chain Module Bearing Journals

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IMPORTANT: The camshaft sprocket (2) must remain positioned on journal of crankshaft.

Sprocket (1) of timing chain.

Sprocket (2) of oil pump.

Fig 9: Identifying Timing Chain Camshaft Sprocket

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Secure chain module (1) with rubber part (3) to facilitate assembly.

Pull timing chain (2) upwards until sprocket (4) rests against chain guide (1).

Install timing chain (2) and sprocket (4) in this position.

Installation note:

Always keep timing chain (2) tensioned; it is possible for timing chain (2) to jam on chain module (1).

Fig 10: Locating Timing Chain

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Installation position of both sprockets.

Sprocket (1) of oil pump.

Guide rail (2) of timing chain.

Hub (3) on crankshaft.

Sprocket (4) of timing chain.

Fig 11: Identifying Timing Chain Sprocket And Guide Rail

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Check oil pump sprocket (2) is in correct installation position.

Insert chain module with timing chain and secure.

Attach crankshaft hub.

Screw in central bolt.

Fig 12: Attaching Oil-Pump Camshaft Sprocket To Crankshaft

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Remove special tool 11 9 280 from hub.

Secure central bolt with special tool 00 9 120 .

Tightening torque: 11 21 1AZ .

Fig 13: Securing Central Bolt With Special Tool 0 490 504 (00 9 120)

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Install VANOS UNIT .

Crank engine twice.

Check TIMING .

Install PTFE RING .

Assemble engine.