11 36 046 Removing And Installing/Replacing Inlet And Exhaust Adjustment Units (N54)

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

For the following special tools, refer to ENGINE- SPECIAL TOOLS .

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

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 . See 11 12 000 REMOVING AND INSTALLING/SEALING CYLINDER HEAD COVER (N54) .

Remove fastener (1) in direction of arrow.

Fig 1: Removing 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: Sliding In 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 Cams Of Inlet 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: Identifying Special Tools 11 4 283 And 11 4 281

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Release central bolt of exhaust adjustment unit (1).

Release central bolt of inlet adjustment unit (2).

Tightening torque. See 11 36 1AZ in 11 36 VARIABLE CAMSHAFT CONTROL .

Release chain tensioner . See 11 31 090 INSTALLING AND REMOVING/REPLACING CHAIN TENSIONER PISTON (N54) .

Fig 5: Identifying Central Bolt Of Inlet And Exhaust 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: Turning Sensor Gears

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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

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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 . See 11 31 005 CHECKING CAMSHAFT TIMING (N54) .

Fit chain tensioner . See 11 31 090 INSTALLING AND REMOVING/REPLACING CHAIN TENSIONER PISTON (N54) .

Fig 8: Identifying Central Bolt Of Inlet And Exhaust 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.