11 36 048 Removing and installing/replacing inlet and exhaust adjustment units on right side (N63)

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Special tools required:

IMPORTANT: When the engine is shut down, the inlet and exhaust camshaft adjuster is normally locked in its initial position.
The situation may arise in some individual cases where this initial position is not reached and the camshaft can continue to be rotated in the adjustment range of the camshaft adjuster.
Where central bolts are not greased at the bolt contact points up to engine number 20024295 , the adjustment gear must be replaced for safety reasons.
The central bolts is greased from engine number 20024296 .

(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 in illustration).
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: Coating Contact Face Of New Central Bolt With Copper Paste

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Release hexagon socket screw.

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

Fig 4: Mounting Special Tool 11 9 900 And Pre-Loading Hex Socket Screw

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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 From Exhaust Camshaft

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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: Detaching Inlet Adjustment Unit

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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 Adjuster With Mark
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