11 36 046 Removing and installing/replacing inlet and exhaust adjustment units (N54)

WARNING: This page is about a different car, the 2010 BMW X6, 2009 BMW X6, and 2008 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

11 0 300
11 4 280
11 4 281
11 4 283

See ENGINE - SPECIAL TOOLS (N54, N63) .

IMPORTANT: To open central bolts, release at inlet and exhaust adjustment units with special tool 11 4 280 only.

Necessary preliminary tasks:

Remove cylinder head cover .

Remove fastener (1) in direction of arrow.

Fig 1: Identifying Fastener

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Slide in special tool 11 0 300 in direction of arrow.

Rotate flywheel (1) at central bolt until firing TDC position at cylinder no. 1 is reached.

IMPORTANT: The TDC bore can be mixed up in automatic transmissions.

Fig 2: Identifying Flywheel And Special Tool 11 0 300

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With cylinder no. 1 in firing TDC position, inlet camshaft (1) at cylinder no. 6 points downwards at an angle to the left.

With cylinder no. 1 in firing TDC position, exhaust camshaft (2) at cylinder no. 6 points downwards at an angle to the right.

Installation:

If the timing is checked while the engine is installed, this is only possible with a mirror.

Fig 3: Identifying Inlet Camshaft And Exhaust Camshaft

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

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

Fig 4: Secure Special Tool 11 4 283 On Cylinder Head

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Release central bolt of exhaust adjustment unit (1).

Release central bolt of inlet adjustment unit (2).

Tightening torque 11 36 1AZ , see 11 36 VARIABLE CAMSHAFT CONTROL

Release chain tensioner

Fig 5: Identifying Central Bolt Of Exhaust Camshaft And Inlet Camshaft

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Detach exhaust adjustment unit (1) from exhaust camshaft.

Detach inlet adjustment unit (2) from inlet camshaft.

Installation:

To facilitate removal and installation of the inlet and exhaust adjustment units, turn the sensor gears at the opening downwards.

Fig 6: Identifying Exhaust Adjustment Unit And Inlet Adjustment Unit

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IMPORTANT:

Risk of mixing up the inlet and exhaust adjustment units .
Mixing up the inlet and exhaust adjustment units will cause damage to the engine.

The inlet and exhaust adjustment units are different.

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

VANOS is marked with EIN and IN for the inlet camshaft.

Sensor gears can be fitted alternatively.

Fig 7: Identifying VANOS Mark Of Exhaust Camshaft And Inlet Camshaft

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Position inlet and exhaust adjustment units on camshafts.

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

Installation:

Replace screws (1 and 2).

Insert screws (1 and 2).

Adjust valve timing .

Fit chain tensioner .

Fig 8: Identifying Central Bolt Of Exhaust Camshaft And Inlet Camshaft

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IMPORTANT: Incorrect installation possible.

Make sure that timing chain is guided in tensioning rail (1).

NOTE: Schematic representation on removed chain drive.

Fig 9: Identifying Tensioning Rail

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Remove all special tools.

Assemble engine.