Necessary preliminary work

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Read fault memory and make a documentary record
Remove LEFT CYLINDER HEAD COVER
Remove LEFT TIMING CASE COVER
Check timing See 1131070 CHECKING CAMSHAFT TIMING ON LEFT SIDE (N63) or 1131071 CHECKING CAMSHAFT TIMING ON RIGHT SIDE (N63) .

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

Fig 1: Identifying 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 Central Bolts Of Intake And Exhaust Camshaft Adjusters

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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 intake and exhaust camshaft adjuster must be renewed due to safety reasons.

Installation note:

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

Fig 3: Checking Head Of Central Bolt

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Release hexagon socket screw.

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

Fig 4: Preloading Hexagon Socket Screw With Special Tool 00 9 250 To 0.6 Nm

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Release screws (1).

Remove upper tensioning rail (2).

NOTE: Shown without special tools for purposes of clarity.

Fig 5: Identifying Upper Tensioning Rail And Screws

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Remove central bolt (2) of inlet adjustment unit.

Installation note:

Replace central bolts after releasing.

Fig 6: Identifying Central Bolts Of Intake And Exhaust Camshaft Adjusters

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

Fig 7: Identifying Inlet Adjustment Unit

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

Lift out inlet adjustment unit (2).

Fig 8: Identifying Inlet Adjustment Unit And Timing Chain

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Remove central bolt (1) of exhaust adjustment unit.

Installation note:

Replace central bolts after releasing.

Fig 9: Identifying Central Bolts Of Intake And Exhaust Camshaft Adjusters

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

Fig 10: Identifying Exhaust Adjustment Unit

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

Lift out exhaust adjustment unit (2).

Fig 11: Identifying Exhaust 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 Adjusters Mark
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Installation note:

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

Fig 13: Checking Head 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 Central Bolts Of Intake And Exhaust Camshaft Adjusters

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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 Set Of Special Tools 11 9 890

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Place special tool 11 9 893 on exhaust camshaft.

Fig 17: Identifying Special Tool 11 9 893 On Exhaust Camshaft

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Fit special tool 11 9 893 on intake camshaft.

Fig 18: Identifying Special Tool 11 9 893 On Intake Camshaft

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Installation note:

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

Screw special tool 11 9 894 into cylinder head.

Fig 19: Positioning Special Tool 11 9 893 On Intake Camshaft And Exhaust Camshaft

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

Fig 20: Positioning Special Tool 11 9 892 On Special Tool 11 9 893

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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: Preloading Hexagon Socket Screw With Special Tool 00 9 250 To 0.6 Nm

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Check special tools 11 9 190 for correct seating.

Fig 22: Securing Vibration Damper With Special Tool 11 9 190

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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 Central Bolts Of Intake And Exhaust Camshaft Adjusters

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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 in 150° firing TDC position cylinder 1.

Fig 24: Securing Vibration Damper With Special Tool 11 9 190

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Check timing again. See 1131070 CHECKING CAMSHAFT TIMING ON LEFT SIDE (N63) .

Remove all special tools.