11 36 046 Removing and installing or replacing intake and exhaust camshaft adjusters (N52T)

Special tools required:

Necessary preliminary work:

Remove CYLINDER HEAD COVER
Check TIMING

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

Fit special tool 11 4 283 with screws (1).

Fit special tool 11 4 281 on special tool 11 4 283 .

Fig 1: Installing Special Tools To Secure The Central Bolts On The Intake And Exhaust Camshaft Adjusters And Camshafts

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IMPORTANT: Fit special tool 11 4 282 underneath on side of intake camshaft.

Release chain tensioner (2).

Tightening torque: 11 31 6AZ .

Release central bolts on inlet and exhaust adjustment units (1).

Tightening torque: 11 36 1AZ .

Installation:

Replace central bolts.

NOTE: Picture in CAD and does not show special tools.

Fig 2: Identifying Chain Tensioner And Central Bolts

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Remove exhaust camshaft adjuster (1) from exhaust camshaft.

Remove inlet adjuster (2) from intake camshaft.

Installation:

To facilitate removal and installation of the inlet and exhaust camshaft adjusters, turn the camshaft sensor wheels downwards at the opening.

Fig 3: Removing Exhaust Camshaft Adjuster & Inlet Adjuster

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IMPORTANT: Risk of mixing up the intake and exhaust camshaft adjusters.
Danger of engine damage!

Intake and exhaust adjustment units are different.

VANOS is marked with AUS/EX for the exhaust camshaft.

VANOS is marked with EIN/IN for the intake camshaft.

Camshaft sensor wheels can be fitted alternatively.

Fig 4: Identifying Exhaust Camshaft Markings

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Position inlet and exhaust adjustment units on camshafts.

Installation position of intake and exhaust adjustment units can be freely selected.

Insert central bolts (1).

Tightening torque: 11 36 1AZ .

Installation:

Replace central bolts.

Fig 5: Identifying Chain Tensioner And Central Bolts

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

NOTE: Picture in CAD and does not show special tools.

IMPORTANT: Incorrect installation possible!

Press tensioning rail (1) by hand against guide rail and make sure timing chain is guided in tensioning rail (1).

NOTE: Schematic representation of removed timing chain module.

Adjust VALVE TIMING .

Fit CHAIN TENSIONER .

Fig 6: Identifying Tensioning Rail

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Assemble engine.