11 36 046 Removing and installing or replacing intake and exhaust camshaft adjusters (N55)

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Special tools required:

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER
Check TIMING

IMPORTANT: Only use special tool 11 4 280 to loosen central bolts (1 and 2) of Vanos unit.
Modify special tool 11 4 280 for N55 engine.

Release central bolts (1 and 2).

Fig 1: Identifying Vanos Unit Central Bolts

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Release chain tensioner (1).

Tightening torque 11 31 7AZ .

IMPORTANT: Have a cleaning cloth ready. A small quantity of engine oil will emerge after the screw connection has been released.
Make sure no engine oil runs onto belt drive.

Installation note:

Replace sealing ring.

Fig 2: Identifying Chain Tensioner

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Slightly lift timing chain (1) and remove exhaust camshaft adjuster (2) from exhaust camshaft.

Slightly tilt exhaust camshaft adjuster (2) and remove upward.

Fig 3: Removing Exhaust Camshaft Adjuster From Exhaust Camshaft

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Slightly lift timing chain (1) and remove intake adjuster (2) from intake camshaft.

Slightly tilt intake adjuster (2) and remove upward.

Fig 4: Removing Intake Adjuster From Intake Camshaft

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

Intake and exhaust camshaft adjusters are different.

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

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

Sensor gears can be fitted alternatively.

Fig 5: Identifying Intake And Exhaust Camshaft Adjusters

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Installation note:

Replace central bolts.

Place intake adjuster onto intake camshaft.

Place exhaust camshaft adjuster onto exhaust camshaft.

Installation position of intake and exhaust camshaft adjusters can be freely selected.

Insert central bolts (1) until stop.

Release central bolts (1) again by a 90° turn.

Fig 6: Identifying Central Bolts

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IMPORTANT: Incorrect assembly 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.

Fig 7: Locating Tensioning Rail

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Turn sensor gears (2) in direction of arrow until retaining pins (1) on special tool 11 4 290 match up.

11 4 290 Slide on special tool in direction of arrow.

Fig 8: Turning Sensor Gears

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Special tool 11 4 280 must be mounted for fastening central bolts

Use bolts to fasten special tool 11 4 290 .

11 9 340 Screw special tool into cylinder head.

Fig 9: Screwing Special Tool Into Cylinder Head

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Pretension timing chain with special tool 11 9 340 , 00 9 250, see 00 9 4600, 6 Nm

Fig 10: Installing Timing Chain Using Special Tool 11 9 340

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Use special tool 00 9 120 to tighten central bolts of intake adjuster.

Tightening torque 11 36 1AZ .

Fig 11: Tightening Central Bolts Of Intake Adjuster Using Special Tool 00 9 120

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Use special tool 00 9 120 to tighten central bolts of exhaust camshaft adjuster.

Tightening torque 11 36 1AZ .

Fig 12: Tightening Central Bolts Of Exhaust Camshaft Adjuster Using Special Tool 00 9 120

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Remove all special tools.

Rev engine on the central bolt twice in the direction of engine rotation and verify TIMING .

Assemble engine.