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

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Special tools required:

00 9 120
00 9 250
11 8 570
11 9 190
11 9 890
11 9 891
11 9 892
11 9 893
11 9 894
11 9 900

See MAINTENANCE AND GENERAL INFORMATION - SPECIAL TOOLS .

See ENGINE - SPECIAL TOOLS (N54, N63) .

IMPORTANT: When the engine is shut down, the inlet and exhaust adjustment unit 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 adjustment unit.

Where central bolts are not greased at the bolt contact points up to engine number 20024295 , the VANOS gear must be replaced for safety reasons.

The central bolts is greased from engine number 20024296 .

(cylinder bank 1 to 4)

Necessary preliminary tasks:

Read fault memory and make a documentary record
Remove right cylinder head cover
Remove right timing case cover
Check timing .

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

Fig 1: Identifying Special Tools (11 9 892 And 11 9 891)

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IMPORTANT: If special tool 11 9 890 cannot 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 inlet and exhaust adjustment units.

Installation:

Replace central bolts after releasing.

Fig 2: Identifying Inlet And Exhaust Camshaft 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 VANOS gear must be replaced for safety reasons.

Installation:

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

Fig 3: Identifying Central Bolt

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Release hexagon socket screw.

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

Fig 4: Identifying Hexagon Socket Screw With Special Tool

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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:

Replace central bolts after releasing.

Fig 6: Identifying Central Bolt Of Exhaust Adjustment Unit

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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:

Replace central bolts after releasing.

Fig 9: Identifying Central Bolt Of Inlet Adjustment Unit

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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:

Inlet and exhaust adjustment units are different.

Mixing up the inlet and exhaust adjustment units will cause damage to the engine.

Inlet adjustment unit (1) is marked with EIN
Exhaust adjustment unit (2) is marked with AUS

Fig 12: Identifying Mark On Inlet And Exhaust Adjustment Units

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Installation:

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

Fig 13: Identifying Central Bolt

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

Feed adjustment unit 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 And Exhaust Camshafts Central Bolts

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

Tightening torque: 11 31 4AZ, see 11 31 CAMSHAFT

Fig 15: Identifying Upper Tensioning Rail And Screws

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Get special tool kit 11 9 890 ready for securing camshafts.

Fig 16: Identifying Special Tool Kit

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Fit special tool 11 9 893 on exhaust camshaft.

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

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Place special tool 11 9 893 on inlet camshaft.

Installation:

Align exhaust and inlet camshafts in such a way that special tools 11 9 893 rest without a gap on the cylinder head.

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

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Screw special tool 11 9 894 into cylinder head.

Fig 19: Identifying Special Tool 11 9 894 On Cylinder Head

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

Fig 20: Identifying Special Tools (11 9 892 And 11 9 891)

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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: Identifying Hexagon Socket Screw With Special Tool

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Check special tools 11 9 190 for correct seating.

Fig 22: Identifying Special Tools Position (11 8 570 And 11 9 190)

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

Tightening torque 11 36 1AZ, see 11 36 VARIABLE CAMSHAFT CONTROL

Fig 23: Identifying Inlet And Exhaust Camshaft 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 returns to 150° before cylinder no. 1 firing TDC position .

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: Identifying Special Tools Position (11 8 570 And 11 9 190)

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Check timing again.

Remove all special tools.