11 31 051 Replacing timing chain (N16)

Special tools required:

Attention!

Set a modified procedure for timing.

The timing is not determined at firing TDC of cylinder no. 1.

All pistons are in the 90° position.

Observe direction of engine rotation (direction of rotation always clockwise when viewed towards timing drive side).

The sump does not have to be removed for this operation.

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER .
Remove all SPARK PLUGS .
Remove BELT TENSIONER .
Remove VIBRATION DAMPER .
Remove CHAIN TENSIONER .
Remove both VANOS ADJUSTMENT UNITS .
Remove PTFE RING at front.

Do not remove special tool 11 9 590 while performing repair.

Fig 1: Securing Crankshaft Using Special Tool (11 9 590)

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Move front panel into ASSEMBLY POSITION .

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

Fig 2: Identifying Engine Crane And Lifting Eye

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Undo bolts (1) and remove adapter plate.

Remove right engine mount. See 22 11 001 REPLACING RIGHT ENGINE MOUNT and 22 11 080 REMOVING AND INSTALLING/REPLACING ADAPTER PLATE .

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 9 540 .

Fig 5: Mounting Special Tool (11 9 540) On Camshaft

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Attention!

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).

NOTE: Illustration shows with engine removed.

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

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Release central bolt in direction of arrow.

Tightening torque: 11 21 1AZ .

NOTE: Illustration shows with engine removed.

Fig 7: Releasing Central Bolt

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Release bearing journal (1 and 2).

Tightening torque: 11 11 4AZ .

Fig 8: Identifying Bearing Journals Of Chain Module

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Remove hub (3) towards front.

Remove chain module with timing chain.

NOTE: Illustration shows with engine removed.

Fig 9: Removing Timing Chain Module

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Attention!

The oil pump sprocket must remain fixed on the crankshaft hub.

If the sprocket falls in the sump, the sump will have to be removed.

Camshaft sprocket (1) of timing chain.

Sprocket (2) of oil pump.

Fig 10: Identifying Timing Chain Camshaft Sprocket And Oil Pump Sprocket

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

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

Install timing chain (2) and camshaft 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 11: Identifying Chain Module, Timing Chain, Rubber Part And Sprocket

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Remove hub (3) towards front.

Remove chain module with timing chain.

NOTE: Illustration shows with engine removed.

Fig 12: Removing Timing Chain Module

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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 13: Checking Oil Pump Sprocket

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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 14: Installation Position For Oil Pump And Timing Chain Sprockets

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Remove special tool 11 9 280 from hub.

Secure central bolt with special tool 00 9 120 .

Fig 15: Securing Central Bolt With Special Tool (00 9 120)

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Install VANOS ADJUSTMENT UNITS .

Crank engine twice.

Check TIMING .

Install PTFE RING .

Assemble engine.