11 31 505 Adjusting timing of camshaft(s) (N55)

Special tools required: 

• 00 9 120
• 00 9 250
• 11 4 280
• 11 4 281
• 11 4 282
• 11 4 285
• 11 4 290
• 11 9 340

Rework special tool 11 4 281 on the basis of the following DESCRIPTION .

Necessary preliminary tasks: 

• Remove CYLINDER HEAD COVER .
• Check TIMING .

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

Fig 1: Identifying Intake Camshaft Position

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

Fig 2: Identifying Exhaust Camshaft Cam Position

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Part numbers (2) on intake and exhaust camshafts (1) point upwards.

Fig 3: Locating Intake And Exhaust Camshaft Code

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Secure special tool 11 4 285 with bolts (1) to cylinder head.

Mount reworked special tool 11 4 281 on the intake camshaft.

Mount special tool 11 4 281 on the exhaust camshaft.

Fig 4: Installing Special Tool (11 4 285) Onto Cylinder Head And Camshafts

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Release central bolts (1 and 2).

Fig 5: Identifying Central Bolts

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Release CHAIN TENSIONER  (1).

Tightening torque 11 31 7AZ .

Make sure no engine oil runs onto belt drive.

Fig 6: Identifying Chain Tensioner

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Installation note: 

Replace sealing ring.

Turn sensor gears (2) in direction of arrow until retaining pins (1) on special tool 11 4 290 match up.

11 4 290 Slide on special tool in direction of arrow.

Fig 7: Turning Sensor Gears (N55)

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Use bolts to fasten special tool 11 4 290 .

Installation note: 

Replace both central bolts.

Screw in both central bolts.

Release both central bolts 90°.

11 9 340 Screw special tool into cylinder head.

Fig 8: Installing Special Tool (11 4 340) With Cylinder Head

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Pretension timing chain with special tool 11 9 34000 9 2500, 6 Nm 

Fig 9: Pretensioning Timing Chain Using Special Tool (00 9 250)

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Use special tool 00 9 120 to tighten central bolts of intake adjuster.

Tightening torque 11 36 1AZ .

Fig 10: Tightening Intake Adjuster Central Bolts Using Special Tool (00 9 120)

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Use special tool 00 9 120 to tighten central bolts of exhaust camshaft adjuster.

Tightening torque 11 36 1AZ .

Fig 11: Tightening Exhaust Camshaft Adjuster Central Bolts Using Special Tool (00 9 120)

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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.