11 31 505 Adjusting timing of camshaft(s) (N20)

Special tools required: 

• 2 212 831 .
• 11 9 340 .
• 00 9 460 .

Necessary preliminary work: 

• Remove CYLINDER HEAD COVER .
• Check TIMING .

With 1st cylinder in TDC firing position, cams of intake camshaft point upwards at an angle.

Position tracing gauge (2) on mounting flats of intake camshaft.

Order number: 2 212 831 .

Fig 1: Positioning Tracing Gauge On Mounting Flats Of Intake Camshaft

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With 1st cylinder in TDC firing position, cams of exhaust camshaft point upwards at an angle.

Fig 2: Positioning Tracing Gauge On Mounting Flats Of Exhaust Camshaft

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The designation E and A on the intake and exhaust camshaft (1) as well as the part numbers can be read from above.

Fig 3: Locating Camshaft Designation

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Secure mounting bridge (1) on cylinder head.

Secure tracing gauges (2 and 3) to mounting bridge (1).

Fig 4: Securing Mounting Bridge On Cylinder Head And Securing Tracing Gauges To Mounting Bridge

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Secure tracing gauge (2) with screw (5).

Fig 5: Identifying Screw Connection

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Screw (6) must be removed for securing the screw (7).

Secure tracing gauge with screw (7).

Fig 6: Securing Tracing Gauge With Screw

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Undo central bolts (2 and 3).

Fig 7: Identifying Central Bolts

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Remove vacuum unit (1) and lay to one side.

Release CHAIN TENSIONER  (2).

Tightening torque 11 31 7AZ .

Installation note: 

Replace sealing ring.

Fig 8: Identifying Vacuum Unit And Chain Tensioner

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Rotate camshaft sensor wheel until retaining pin (1 and 2) match up with setting gauge.

Secure camshaft sensor wheel.

Fig 9: Identifying Retaining Pins

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Pretension timing chain with special tool 11 9 34000 9 460 (250)0, 6 Nm 

Fig 10: Pretensioning Timing Chain Using Special Tools

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Only use special tool to secure central bolt (1) of intake camshaft adjuster.

Tightening torque 11 36 1AZ .

Fig 11: Securing Central Bolt Of Intake Camshaft Adjuster

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Only use special tool to secure central bolt (1) of exhaust camshaft adjuster.

Tightening torque 11 36 1AZ .

Fig 12: Securing Central Bolt Of Exhaust Camshaft Adjuster

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Remove all special tools.

Crank engine on the central bolt twice in the direction of engine rotation and check the TIMING .

Assemble engine.