Removing and installing or replacing intake and exhaust camshaft adjusters (B46/B48 4-Cyl. Engine) (4' Series Coupe/Convertible, 4' Series Gran Coupe Sedan)

Special tools required: 

• 2 358 122
• 0 496 855
• 2 450 487
• 11 6 480

Necessary preliminary work: 

• Remove CATALYTIC CONVERTER .
• Check TIMING .

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Overview chart of the intake camshaft adjuster:

7 608 788 Intake camshaft adjuster

8 617 692 Intake camshaft adjuster

8 684 920 Intake camshaft adjuster

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Overview chart of the exhaust camshaft adjuster:

7 608 789 Exhaust camshaft adjuster

8 617 693 Exhaust camshaft adjuster

8 684 921 Exhaust camshaft adjuster

Removal: 

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Remove chain tensioner (1).

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Version 1 

To release the central valve (1), use the reversible ratchet head (2) from the special tool kit 0 496 855 with special tool 2 450 487.

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Version 2 

To release the central valve (1) use special tool 0 496 855.

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Release VANOS central valve of the exhaust camshaft adjuster (1) with special tool 0 496 855.

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Release VANOS central valve of the intake adjuster (1) with special tool 0 496 855.

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Remove VANOS central valve (1) of intake side.

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Remove intake adjuster (1) from intake camshaft.

Slightly tilt intake adjuster (1) and remove downwards.

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Remove VANOS central valve (1) of exhaust side.

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Remove exhaust camshaft adjuster (1) from exhaust camshaft.

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

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Installation: 

Intake and exhaust camshaft adjusters are different.

For the exhaust camshaft the exhaust camshaft adjuster is marked with EX  .

The intake adjuster for the intake camshaft is marked with IN  .

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Feed intake adjuster (1) into timing chain (2) and position on intake camshaft (3).

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Installation note: 

Version A with the thread M22: 

Coat the VANOS central valve (A) on the thread (1) with fresh engine oil  .

Coat the VANOS central valve (A) on the contact surface (2) with fresh engine oil  .

Version B with the thread M21: 

Coat the VANOS central valve (B) on the thread (1) with fresh engine oil  .

Coat the VANOS central valve (B) on the contact surface (2) with fresh engine oil  .

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Abut VANOS central valve (1) of intake side.

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Feed exhaust camshaft adjuster (1) into timing chain (2) and position on exhaust camshaft (3).

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Installation note: 

Version A with the thread M22: 

Coat the VANOS central valve (A) on the thread (1) with fresh engine oil  .

Coat the VANOS central valve (A) on the contact surface (2) with fresh engine oil  .

Version B with the thread M21: 

Coat the VANOS central valve (B) on the thread (1) with fresh engine oil  .

Coat the VANOS central valve (B) on the contact surface (2) with fresh engine oil  .

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Abut VANOS central valve (1) of exhaust side.

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Install new chain tensioner.

Parts  : Chain tensioner

Tighten chain tensioner (1).

Tightening torque 11 31 1AZ .

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Tighten VANOS central valve of the intake adjuster (1) with special tool 0 496 855.

Tightening torque 11 36 1AZ .

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Tighten VANOS central valve of the exhaust camshaft adjuster (1) with special tool 0 496 855.

Tightening torque 11 36 1AZ .

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Remove all special tools.

Crank engine with special tool 11 6 480 twice in direction of engine rotation.

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Required follow-up work: 

• Check TIMING .
• Install CATALYTIC CONVERTER .

When replacing the intake and exhaust camshaft adjusters, the I-level must be encoded and programmed  if necessary  .

• Connect diagnosis system and follow diagnosis instructions 
• Service functions
• Power train
• Engine electronics
• Reset VANOS adaptation values
• Encode and program l-level if necessary