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

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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.

Fig 2: Identifying Chain Tensioner

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Installation note:

Replace sealing ring.

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.

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 Marking On Exhaust And Inlet Camshaft

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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.

Fig 6: Identifying Central Bolts

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Insert central bolts (1) until stop.

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

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: Fastening Central Bolts Using Special Tools (11 4 280), (11 4 290) & (11 9 340)

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Pretension timing chain with special tool 11 9 340 & 00 9 2500, 6 Nm

Fig 10: Identifying Special Tool (11 9 340) And (00 9 250)

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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

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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

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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.