11 36 048 Removing and installing/replacing inlet and exhaust adjustment units on right side (N74)

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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 adjuster.

(cylinder bank 1 to 6)

Necessary preliminary tasks:

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: Gripping Special Tools At Hexagon Head Of Camshaft

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IMPORTANT: If special tool 11 9 890 can not be fitted, counter-hold at hexagon of the relevant camshafts when releasing central bolts.

Release central bolts (1 and 2) of inlet and exhaust adjustment units.

Installation:

Replace central bolts after releasing.

Fig 2: Identifying Inlet And Exhaust Adjustment Units Central Bolts

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Release hexagon socket screw.

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

Fig 3: Pretensioning Chain Using Special Tool 11 9 900

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Release screws (1).

Remove upper tensioning rail (2).

Remove adjustment units.

Fig 4: Identifying Sliding Rail And Screws

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IMPORTANT: Danger of mix-up:

Intake and exhaust adjustment units are different.

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

Intake adjuster (1) is marked with ON .
Exhaust camshaft adjuster (2) is marked with OFF .

The exhaust camshaft adjuster is equipped with the fixture for the vacuum pump on cylinder 1 to 6.

Fig 5: Identifying Inlet And Exhaust Camshaft Adjusters Marking

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Installation:

Apply copper paste to the central bolt (1) only on the contact surface for the intake adjuster.

It is not permitted to grease the contact surface for the exhaust camshaft adjuster.

Fig 6: Locating Central Bolt Coating Contact Face

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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 7: Identifying Inlet And Exhaust Adjustment Units Central Bolts

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

Tightening torque: see 4AZ in 11 31 CAMSHAFT

Fig 8: Identifying Sliding Rail And Screws

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Get special tool 11 9 890 ready for securing camshafts.

Fig 9: Identifying Special Tools (11 9 890, 11 9 891, 11 9 892, 11 9 893, 11 9 895)

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Fit special tool 11 9 893 on intake camshaft.

Fig 10: Fitting Special Tool 11 9 893 On Intake Camshaft

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Place special tool 11 9 893 on exhaust camshaft.

Installation:

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

Fig 11: Fitting Special Tool 11 9 893 On Intake Camshaft

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Screw special tool 11 9 894 into cylinder head.

Fig 12: Screwing Special Tool 11 9 895 Into Cylinder Head

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Press special tool 11 9 892 down with special tool 11 9 89 1.

Fig 13: Releasing Central Bolts Using Special Tools

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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 14: Pretensioning Chain Using Special Tool 11 9 900

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Check special tools 11 9 190 for correct seating.

Fig 15: Identifying Special Tools 11 9 190 And 11 8 570

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Join central bolt (1) of adjuster (2).

Tightening torque: see 1AZ in 11 36 VARIABLE CAMSHAFT CONTROL

Fig 16: Tightening Inlet Camshaft Adjuster Central Bolt

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Join central bolt (1) of adjuster (2).

Tightening torque: see 1AZ in 11 36 VARIABLE CAMSHAFT CONTROL

Fig 17: Tightening Camshaft Adjuster Central Bolt

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Secure central bolt (1) of adjuster (2) with special tool 00 9 120 .

Tightening torque: see 1AZ in 11 36 VARIABLE CAMSHAFT CONTROL

Fig 18: Tightening Exhaust Camshaft Adjuster Central Bolt

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Secure central bolt (1) of adjuster with special tool 00 9 120 .

Tightening torque: see 1AZ in 11 36 VARIABLE CAMSHAFT CONTROL

Fig 19: Securing Central Bolt Of Inlet Camshaft Adjuster With Special Tool 00 9 120

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Remove special tools 11 9 190 and 11 8 570 .

Crank engine at central bolt two times in direction of rotation.

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

Secure special tool 11 9 190 .

Fig 20: Identifying Special Tools 11 9 190 And 11 8 570

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Check TIMING again.

Remove all special tools.