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

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Special tools required:

00 9 120 .
00 9 250
11 4 280 .
11 4 290 .
11 9 340 .

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: Identifying Timing Chain And Exhaust Camshaft Adjuster

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

Slightly tilt intake camshaft 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.

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/Exhaust Camshaft Markings

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Installation note:

Replace central bolts .

Place intake camshaft 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: Identifying 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 Until Locating Pins On Special Tool Match Up

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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 .

Screw special tool 11 9 340 into cylinder head.

Fig 9: Fitting Special Tools

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Pretension timing chain with special tool 11 9 340 00 9 250 0, 6 Nm

Fig 10: Pretensioning Timing Chain Using Special Tools

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

Tightening torque 11 36 1AZ .

Fig 11: Tightening Central Bolts Of Intake Camshaft 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.