11 36 046 Removing and installing/replacing intake and exhaust camshaft adjusters (N20, N26)

Special tools required:

83 30 2 212 831
11 4 480
83 30 0 495 105
83 30 2 212 830
11 9 340
00 9 250
00 9 460

Necessary preliminary tasks:

Remove CYLINDER HEAD COVER .
Check TIMING .
Remove both pulse sensors for camshafts . See 12 14 523 REPLACING PULSE SENSOR ON INTAKE CAMSHAFT (N20) or 12 14 524 REPLACING PULSE SENSOR ON EXHAUST CAMSHAFT (N20) .

IMPORTANT: To release the central bolt, screw connection (7) on the exhaust camshaft is necessary.

Fig 1: Releasing Central Bolt With Screw Connection On Exhaust Camshaft

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IMPORTANT: To release the central bolt, screw connection (5) on the intake camshaft is necessary.

Fig 2: Releasing Central Bolt With Screw Connection On Intake Camshaft

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IMPORTANT: Use only special tool (1) to release central bolt of the VANOS unit.
Order number: 83 30 2 212 831

Fig 3: Releasing Central Bolt Of VANOS Unit Using Special Tool

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

Fig 4: Identifying Central Bolt Of Exhaust Camshaft Adjuster

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Release central bolt (1) of the intake adjuster.

Fig 5: Identifying Central Bolt Of Intake Adjuster

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Release screws (1).

Tightening torque: 11 65 4AZ .

Fig 6: Identifying Screws

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Release chain tensioner (2).

Tightening torque: 11 31 7AZ .

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

Installation note:

Replace sealing ring.

Fig 7: Identifying Vacuum Unit And Chain Tensioner

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Remove VANOS solenoid valve (1) of the exhaust side.

Remove pulse sensor wheel (2) of the exhaust side and set down on special tool 11 4 480 in neat order.

Order number: 83 30 0 495 105

Fig 8: Identifying Exhaust Side VANOS Solenoid Valve And Pulse Sensor Wheel

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

Slightly tilt exhaust camshaft adjuster (1) and remove upward.

Fig 9: Removing Exhaust Camshaft Adjuster From Exhaust Camshaft

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Remove VANOS solenoid valve (1) of the intake side.

Remove pulse sensor wheel (2) of the intake side and set down on special tool 11 4 480 in neat order.

Fig 10: Identifying Intake Side VANOS Solenoid Valve And Pulse Sensor Wheel

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

Slightly tilt intake adjuster (1) and remove upward.

Fig 11: 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 EX for the exhaust camshaft.

VANOS is marked with IN for the intake camshaft.

Fig 12: Identifying Intake/Exhaust Camshaft Identification Mark

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Installation note:

The camshaft sensor wheel can be optionally installed.

Turn camshaft sensor wheel until the retaining pins (1 and 2) match up on the special tool.

Move retaining pins (1 and 2) in direction of arrow.

Order number: 83 30 2 212 830

Fig 13: Securing Camshaft Sensor Wheel

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Secure special tool (1) with bolts.

Move central bolts (2 and 3) to the adjuster units to the system.

Order number: 83 30 2 212 830

Fig 14: Securing Special Tool With Bolts

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11 9 340 Screw special tool into cylinder head.

Timing chain with special tool 11 9 340 and or 00 9 250 to 0.6 Nm pretension.

Fig 15: Identifying Special Tool (11 9 340) And (00 9 250)

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Secure central bolt (1) of intake adjuster with special tool.

Tightening torque: 11 36 1AZ .

Fig 16: Securing Central Bolt Of Intake Adjuster

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Secure central bolt (1) of the exhaust camshaft adjuster with special tool.

Tightening torque: 11 36 1AZ .

Fig 17: Securing Central Bolt Of Exhaust Camshaft Adjuster

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Remove all special tools.

Install CHAIN TENSIONER .

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

Assemble engine.