11 36 046 Removing and installing/replacing inlet and exhaust adjustment units (N12)

WARNING: This page is about a different variant/trim than selected.

IMPORTANT: Always release both central bolts to adjust the timing.
The timing is not determined at firing TDC of cylinder no. 1.
Modified procedure for timing adjustment.
All pistons are in the 90° position.
Check locking of adjustment units.

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER .
Check TIMING .

Rotate crankshaft at central bolt.

Slide in special tool 11 9 590 in direction of arrow and block crankshaft.

Fig 1: Identifying Special Tool (11 9 590)

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Release screws (1).

Remove slide rail (2).

Fig 2: Identifying Screws And Slide Rail

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IMPORTANT: Risk of damage!
To open central bolt, mount special tool 11 9 540 on camshaft.
If the setting gauges cannot be positioned, grip the camshaft with an open-end wrench to release the central bolt.
Refer to Adjusting TIMING .

Fig 3: Mounting Special Tool On Camshaft (11 9 540)

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Release chain tensioner (1) (have a cleaning cloth ready).

Tightening torque: 11 31 4AZ.

Fig 4: Identifying Chain Tensioner

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Release bearing pin (1) on guide rail.

Tightening torque: 11 11 7AZ.

Installation:

Replace sealing ring.

Fig 5: Identifying Bearing Pin On Guide Rail

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Release central bolts of inlet adjustment unit (1) and exhaust adjustment unit (2).

Detach inlet adjustment unit from inlet camshaft.

Detach exhaust adjustment unit from exhaust camshaft.

Fig 6: Identifying Central Bolts Of Inlet Adjustment Unit And Exhaust Adjustment Unit

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IMPORTANT:

Danger of mixing up adjustment units.
Mixing up the adjustment units will result in engine damage.

The inlet and exhaust adjustment units are different.

VANOS is marked with IN for the inlet camshaft.

VANOS is marked with EX for the exhaust camshaft.

Fig 7: Inlet And Exhaust Adjustment Units - VANOS Marked With IN For Inlet Camshaft And EX For Exhaust Camshaft

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Place adjustment units of exhaust camshaft marked EX on timing chain.

Position adjustment unit on exhaust camshaft and secure with central bolt (3).

The installation position of the adjustment units can be freely selected.

Fig 8: Identifying Exhaust Camshaft, Timing Chain And Central Bolt

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Place adjustment units of inlet camshaft marked IN on timing chain.

Position adjustment unit on inlet camshaft and secure with central bolt (1).

The installation position of the adjustment units can be freely selected.

Fig 9: Identifying Central Bolt

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Install slide rail (2).

Insert bolts (1).

Fig 10: Installing Slide Rail With Bolts

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11 9 340 Screw special tool into cylinder head.

Pretension timing chain with special tool to 00 9 250 0.6 Nm.

Fig 11: Installing Special Tool (11 9 340) Into Cylinder Head

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Secure central bolt with special tool 1 00 9 120 .

Tightening torque: 11 36 1AZ.

Fig 12: Securing Central Bolt Using Special Tool (00 9 120)

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Secure central bolt with special tool 1 00 9 120 .

Tightening torque: 11 36 1AZ.

Fig 13: Securing Central Bolt Using Special Tool (00 9 120)

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Fit CHAIN TENSIONER .

Check TIMING .

Assemble engine.