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

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 Central Bolts Of VANOS Unit

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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: Identifying Timing Chain And Exhaust Camshaft Adjuster

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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: Identifying Timing Chain And Intake Camshaft Adjuster

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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.

The variable camshaft timing control is marked with AUS/EX for the exhaust camshaft.

The variable camshaft timing control is marked with EIN/IN for the intake camshaft.

The increment wheels can be fitted alternatively.

Fig 5: Identifying Intake And Exhaust Camshaft Adjuster Markings

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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 Of VANOS Unit

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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: Identifying Tensioning Rail

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Turn increment wheel (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 Increment Wheel

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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-In Special Tool 11 9 340 To Cylinder Head

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Pretension timing chain to 0, 6 Nm with special tools 11 9 340 and 00 9 250 .

Fig 10: Pre-Tensioning Timing Chain Using Special Tools

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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 Camshaft Adjuster Using Special Tool

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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

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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.