11 36 046 Removing and installing or replacing intake and exhaust camshaft adjusters (N20)

WARNING: This page is about a different variant/trim than selected.

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 14 524 REPLACING PULSE SENSOR ON EXHAUST CAMSHAFT (N20) or 12 14 523 REPLACING PULSE SENSOR ON INTAKE CAMSHAFT (N20) .
REMOVE bottom clean air pipe.

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

Fig 1: Identifying Camshaft Screw

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

Fig 2: Identifying Intake Camshaft Screw Connection

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

Fig 3: Identifying Central Bolt Of VANOS Unit

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

Fig 4: Identifying Central Bolt Of Exhaust Camshaft Adjuster

Release central bolt (1) of the intake adjuster.

Fig 5: Identifying Central Bolt Of Intake Adjuster

Release screws (1).

Tightening torque: 11 65 4AZ .

Fig 6: Identifying Chain Tensioner Piston Screws

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:

Fig 7: Identifying Chain Tensioner

Replace sealing ring.

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 VANOS Solenoid Valve And Pulse Sensor Wheel

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 Camshaft Adjuster From Exhaust Camshaft

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 VANOS Solenoid Valve And Pulse Sensor Wheel

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

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 VANOS Exhaust And Intake Camshaft Marks

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: Aligning Retaining Pin With Setting Gauge

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: Identifying Camshaft Adjusters Central Bolts

11 9 340 Screw special tool into cylinder head.

Timing chain with special tool 11 9 340 and 00 9 250 or 00 9 460 to

0.6 Nm pretension.

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

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

Tightening torque 11 36 1AZ .

Fig 16: Securing Intake Adjuster Central Bolt

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

Tightening torque 11 36 1AZ .

Fig 17: Securing Exhaust Camshaft Adjuster Central Bolt

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.