Removing and installing or replacing intake and exhaust camshaft adjusters (S55 engine)

Special tools required:

00 9 120
00 9 250
11 4 280
11 4 290
11 9 340
11 4 285
11 4 284
11 4 281
11 4 481

Necessary preliminary work:

Remove CYLINDER HEAD COVER .
Check TIMING .

IMPORTANT: Use only special tool 11 4 280 to loosen the central bolts of the VANOS units.
Remount special tool 11 4 280 for the S55 engine.

Attach the basic carrier 11 4 285 with screws 11 4 284 at 10 Nm.

Secure the intake and exhaust camshafts with special tool 11 4 281 and tightly screw to the basic carrier 11 4 285.

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Slacken the chain tensioner (1).

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Loosen the central bolt (1) of the exhaust camshaft adjuster.

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Loosen the central bolt (1) of the intake adjuster.

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Remove the central bolt (1) and rotor (2) from the intake camshaft and place them on special tool 11 4 481.

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Remove the central bolt (1) and rotor (2) from the exhaust camshaft and place them on special tool 11 4 481.

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Remove chain tensioner (1).

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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.

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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.

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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.

The installation of camshaft sensor wheels is optional.

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Installation note:

Replace the central bolts (1 and 2) .

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 the central bolts (1 and 2) and bring them to the stop.

Loosen the central bolts (1 and 2) by 90° again.

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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 view of the removed chain module of the timing chain.

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Turn the camshaft sensor wheels (2) in the direction of the arrow until the retaining pins (1) are properly aligned on the special tool 11 4 290.

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

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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.

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Pretension timing chain with special tool 11 9 340 00 9 250 0.6 Nm

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

Tightening torque 11 36 1AZ .

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

Tightening torque 11 36 1AZ .

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Remove special tool 11 9 340.

Screw the chain tensioner (1) in.

Tightening torque 11 31 7AZ .

Installation note:

Replace sealing ring.

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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.