11 36 047 Removing and installing/renewing inlet and exhaust camshaft adjusters on left side (N74)

IMPORTANT: When the engine is shut down, the inlet and exhaust camshaft adjusters 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.

(cylinder bank 7 to 12)

Necessary preliminary tasks:

Read fault memory and make a documentary record
Remove LEFT CYLINDER HEAD COVER
Remove LEFT TIMING CASE COVER
Check TIMING

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

Fig 1: Pressing Special Tool 11 9 892 Down With Special Tool 11 9 891

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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 inlet and exhaust camshaft adjusters.

Installation:

Replace central bolts after releasing.

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

Installation:

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

Fig 3: Locating Central Bolt Coating Contact Face

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Release hexagon socket screw.

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

Fig 4: Pretensioning Timing Chain Using Special Tool 11 9 900

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Release screws (1).

Remove upper tensioning rail (2).

Remove camshaft adjusters.

NOTE: Shown without special tools for purposes of clarity.

Fig 5: Identifying Upper Tensioning Rail And Screws

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IMPORTANT: Danger of mix-up:

Intake and exhaust camshaft adjusters are different.

Mixing up the inlet and exhaust camshaft adjusters will cause damage to the engine.

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

Fig 6: Identifying Inlet And Exhaust Camshaft Adjusters Marking

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Installation:

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

Fig 7: Locating Central Bolt Coating Contact Face

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NOTE: Position of camshaft adjusters (3 and 4) in relation to timing chain can be freely selected.

Feed camshaft adjuster into timing chain and position on camshafts.

Insert central bolts (1 and 2) on camshaft adjusters without gaps.

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

Fig 8: 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 9: Identifying Sliding Rail And Screws

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Get special tool 11 9 890 ready for securing camshafts.

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

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Place special tool 11 9 893 on exhaust camshaft.

Fig 12: Placing Special Tool 11 9 893 On Exhaust Camshaft

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Screw special tool 11 9 895 into cylinder head.

Fig 13: Screwing Special Tool 11 9 895 Into Cylinder Head

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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 14: Positioning Special Tool 11 9 893 On Inlet And Exhaust Camshafts

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

Fig 15: Pressing Special Tool 11 9 892 Down With Special Tool 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 16: Pretensioning Timing Chain Using Special Tool 11 9 900

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Check special tools 11 9 190 for correct seating.

Fig 17: Identifying Special Tools 11 9 190 And 11 8 570

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Connect intake camshaft adjuster (2) central screw (1).

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

Fig 18: Identifying Intake Camshaft Adjuster And Central Screw

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Connect exhaust camshaft adjuster (2) central screw (1).

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

Fig 19: Tightening Exhaust Camshaft Adjuster Central Screw

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

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

Fig 20: Securing Intake Adjustment Central Bolt Unit Using Special Tool 00 9 120

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

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

Fig 21: Securing Inlet Camshaft Adjuster Central Bolt Using Special Tool 00 9 120

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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 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 cylinder no. 1 TDC firing position .

Fig 22: Removing Special Tools 11 9 190 And 11 8 570

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Check TIMING again.

Remove all special tools.