11 31 505 Adjusting timing of camshaft(s) (S55 engine)

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
• 11 4 284

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.

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

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

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Secure special tool 11 4 285 with screws 11 4 284 to cylinder head.

Fit reworked special tool 11 4 281 to the intake camshaft and secure with screws (1).

Fit special tool 11 4 281 to the intake camshaft and secure with screws (1).

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Release central bolts (1).

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Release central bolts (1).

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Slacken special tool 11 9 340.

The timing chain must be tension-free.

Illustration: N52

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Replace the central bolt (1) of the intake camshaft.

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Replace the central bolt (1) of the exhaust camshaft.

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

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

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Use bolts to fasten special tool 11 4 290.

Installation note: 

Screw in both central bolts.

Release both central bolts 90°.

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Pretension timing chain with special tool 11 9 340 00 9 250 0.6 Nm 

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

Tightening torque: 11 36 1AZ .

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

Tightening torque: 11 36 1AZ .

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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  again.

Assemble engine.