11 31 505 Adjusting timing of camshaft(s) (B48AO0)

Special tools required: 

• 2 288 380
• 0 496 855
• 2 450 487
• 2 358 122
• 11 6 480

Necessary preliminary work: 

• Check TIMING 
• Remove CATALYTIC CONVERTER

Attention! 

Risk of damage to engine.

Compliance with test instructions and TIMING ADJUSTMENT  is mandatory!

If the crankshaft is disconnected properly, it is not possible to turn the engine forwards or backwards on the vibration damper!

Dimension (Y) = 66 mm.

Insert the special tool 2 288 380 up to dimension (Y) into the dowel hole.

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Special tool 2 288 380 correctly positioned.

The engine is located at the first cylinder at top dead center.

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Special tool 2 288 380 incorrectly positioned.

The TDC setting of the first cylinder has not been achieved.

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Release CHAIN TENSIONER  (1).

Attention! 

Have a cleaning cloth ready. A small quantity of engine oil will escape after the screw connection has been released.

Installation note: 

A new  chain tensioner and sealing ring must be installed.

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Version 1 

To remove the central valve (1), use the changeover ratchet (2) from special tool 0 496 855 with special tool 2 450 487.

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Version 2 

Use special tool 0 496 855 to remove the central valve (1).

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Mount gauge (1) from special tool 2 358 122.

If necessary, turn the crankshaft a little using the special tool 11 6 480.

Mount the counter support (3) and loosen the VANOS central valve of the intake camshaft with the special tool 0 496 855.

If necessary, turn the crankshaft a little further using the special tool 11 6 480.

Mount the counter support (2) and loosen the VANOS central valve of the exhaust camshaft with the special tool 0 496 855.

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Turn both camshafts to position.

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Secure basic carrier (1) by screws (2) on cylinder head.

Position gauge (3) with recess on mounting flats of exhaust camshaft.

Secure basic carrier (3) by screws (5) on basic carrier.

Position gauge (4) with recess on mounting flats of intake camshaft.

Secure gauge (4) by screws (5) on basic carrier.

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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 intake camshaft adjuster (1).

Tightening torque 11 36 1AZ .

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Tighten VANOS central valve of exhaust camshaft adjuster (1).

Tightening torque 11 36 1AZ .

Remove special tools 2 288 380 and 2 358 122.

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

Attention! 

Do not  crank engine back.

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Required reworking: 

• Check TIMING OF CAMSHAFTS 
• Install CATALYTIC CONVERTER
• Install CYLINDER HEAD COVER 
• Install front right WHEEL ARCH COVER .