(cylinder bank 1 to 4)

Necessary preliminary work

Read fault memory and make a documentary record
Remove RIGHT CYLINDER HEAD COVER .
Remove RIGHT GEAR CASE COVER .
Check TIMING .

To release central bolts, use special tool 11 9 890 or grip at hexagon head of camshaft.

Fig 1: Releasing Central Bolts Using Special Tool (11 9 890)

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IMPORTANT: If special tool 11 9 890 can not be fitted, it is necessary when releasing the central bolt to grip the hexagon head of the respective camshafts.

Release central bolts (1 and 2) of intake and exhaust camshaft adjusters.

Installation note:

Replace central bolts after releasing.

Fig 2: Identifying Intake And Exhaust Camshaft Adjusters Central Bolts

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IMPORTANT: Check whether head of central bolt (1) is greased (see arrow).
If no grease can be seen on the bolt head of central bolt (1), the inlet and exhaust adjustment unit must be replaced for safety reasons.

Installation note:

Coat contact face of central bolt (1) with copper paste.

Fig 3: Locating Contact Surface Of Central Bolt

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Release hexagon socket screw.

Release special tool 11 9 900 at knurled screws and remove.

Fig 4: Releasing Special Tool (11 9 900) At Knurled Screws

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Release screws (1).

Remove upper tensioning rail (2).

Fig 5: Identifying Upper Tensioning Rail And Screws

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Remove central bolt (1) of exhaust adjustment unit.

Installation note:

Replace central bolts after releasing.

Fig 6: Identifying Exhaust Adjustment Unit Central Bolt

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Detach exhaust adjustment unit (1) in direction of arrow from exhaust camshaft.

Fig 7: Detaching Exhaust Adjustment Unit

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Feed out exhaust adjustment unit (2) from timing chain (1).

Lift out exhaust adjustment unit (2).

Fig 8: Identifying Exhaust Adjustment Unit And Timing Chain

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Remove central bolt (1) of inlet adjustment unit.

Installation note:

Replace central bolts after releasing.

Fig 9: Identifying Inlet Adjustment Unit Central Bolt

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Detach inlet adjustment unit (1) in direction of arrow from inlet camshaft.

Fig 10: Removing Inlet Adjustment Unit From Inlet Camshaft

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Feed out inlet adjustment unit (2) from timing chain (1).

Lift out inlet adjustment unit (2).

Fig 11: Identifying Inlet Adjustment Unit And Timing Chain

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IMPORTANT: Danger of mix-up:
Intake and exhaust camshaft adjusters are different.
Mixing up the inlet and exhaust adjustment units will cause damage to the engine.

Intake camshaft adjuster (1) is marked IN
Exhaust camshaft adjuster (2) is marked OUT

Fig 12: Identifying Intake And Exhaust Camshaft Adjuster Markings (EIN And AUS)
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Installation note:

Coat contact face of central bolt (1) with copper paste.

Fig 13: Locating Contact Surface Of Central Bolt

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NOTE: Position of adjustment units in relation to timing chain can be freely selected.

Feed adjuster into timing chain and position on camshafts.

Insert central bolts (1 and 2) on adjustment units without gaps.

Release central bolts (1 and 2) by 90 °.

Fig 14: Identifying Inlet Adjustment Unit Central Bolts

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Fit sliding rail (2) and secure with screws (1).

Tightening torque: 11 31 4AZ .

Fig 15: Identifying Sliding Rail And Screws

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Get set of special tools 11 9 890 ready for securing camshafts.

Fig 16: Identifying Special Tools

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Place special tool 11 9 893 on exhaust camshaft.

Fig 17: Checking Exhaust Camshaft Timing Adjustment Using Special Tool (11 9 893)

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Fit special tool 11 9 893 on intake camshaft.

Installation note:

Align exhaust and intake camshafts so that special tools 11 9 893 lie on the cylinder head without any gap.

Fig 18: Checking Intake Camshaft Timing Adjustment Using Special Tool (11 9 893)

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Screw special tool 11 9 894 into cylinder head.

Fig 19: Screwing Special Tool (11 9 894) Into Cylinder Head

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Press special tool 11 9 892 down with special tool 11 9 891 .

Fig 20: Releasing Central Bolts Using Special Tool (11 9 890)

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Screw in special tool 11 9 900 .

Pretension timing chain with special tool 11 9 900 .

Preload hexagon socket screw with special tool 00 9 250 to 0.6 Nm .

Fig 21: Mounting Special Tool (11 9 900) At Position Of Chain Tensioner

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Check special tools 11 9 190 for correct seating.

Fig 22: Securing Vibration Damper Using Special Tools

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Tighten down central screw (1 and 2) of the adjustment units with special tool 00 9 120 .

Tightening torque 11 36 1AZ .

Fig 23: Identifying Intake And Exhaust Camshaft Adjusters Central Bolts

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Remove special tools 11 9 190 and 11 8 570 .

Crank engine at central bolt twice in direction of rotation until engine is in the 150° firing TDC position cylinder 1 again.

Mount special tool 11 8 570 on vibration damper with a bolt.

Secure special tool 11 9 190 at 150° before cylinder no. 1 firing TDC position .

Fig 24: Securing Vibration Damper Using Special Tools

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Check timing See 11 31 070 CHECKING CAMSHAFT TIMING ON LEFT SIDE (N63) or 11 31 071 CHECKING CAMSHAFT TIMING ON RIGHT SIDE (N63) again.

Remove all special tools.