11 31 034 Removing and installing/replacing right inlet camshaft (N62 from 9/03): Removal

Removal of inlet camshaft is described separately from installation.

Remove servomotor for right eccentric shaft.

Remove ignition coils on cylinder bank 1 to 4. See IGNITION COIL .

Remove spark plugs on cylinder bank 1 to 4.

Remove inlet and exhaust adjustment unit on right side.

IMPORTANT: The inlet camshaft must first be rotated so that when the bearing bracket is removed the intermediate levers do not slip out and damage the camshaft.

Rotate inlet camshaft in direction of rotation until cam on 1st cylinder is positioned horizontally as shown in illustration.

Fig 1: Rotating Inlet Camshaft

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IMPORTANT: Do not mix up the camshaft bearing covers of cylinders 1 to 4 and 5 to 8.

NOTE: Bearing caps of inlet camshaft are marked on cylinder bank 1 to 4 with L E1 to L E5 from inlet side.

Release nuts and remove bearing cap L E1.

Fig 2: Removing Bearing Cap L E1

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Release 8 nuts of bearing bracket (1) from outside to inside.

Fig 3: Removing Nuts Of Bearing Bracket From Outside To Inside

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NOTE: Rocker arms are freely accessible after bearing bracket has been removed.

Do "not " remove rocker arm (1) on inlet side.

IMPORTANT: Rocker arms (1) are divided into individual tolerance classes.
The tolerance classes are designated as illustrated with the numbers from 1 to 4.
Used rocker arms (1) may only be reused in the same position.

Fig 4: Removing Rocker Arm

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When replacing rocker arms (1) on inlet side: install rocker arms of the same tolerance class in the same position.

Clamp special tool 11 9 470 as illustrated in a vise.

Fig 5: Clamping Special Tool 11 9 470 In Vise

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IMPORTANT: Do not tilt bearing bracket (1).

Carefully lift out bearing bracket (1).

Fig 6: Lifting Out Bearing Bracket

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Place bearing bracket (1) with inlet camshaft and eccentric shaft as illustrated on special tool 11 9 470.

Secure bearing bracket (1) with a nut (special tool 11 9 473).

Fig 7: Placing Bearing Bracket With Inlet Camshaft And Eccentric Shaft On Special Tool 11 9 470

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IMPORTANT: The lower section of the bearing bracket (1) is machined with the cylinder head and must not be mixed up.

NOTE: Lower section of bearing bracket (1) remains on cylinder head.

Fig 8: Remaining Lower Section Of Bearing Bracket On Cylinder Head

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NOTE: This work step will only be necessary if after the inlet camshaft has been removed the eccentric shaft is also to be removed.

If necessary, remove eccentric shaft sensor (2).

Fig 9: Removing Eccentric Shaft Sensor

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NOTE: Removal of the intermediate levers and torsion springs is described on the 4th cylinder. The same procedure is applicable to cylinders 1 to 3.

Raise one end of torsion spring (1) with special tool 11 9 480.

Lift out intermediate lever (2) and set down in an orderly fashion.

IMPORTANT: Keep holding torsion spring (1) with special tool 11 9 480.

Fig 10: Holding Torsion Spring With Special Tool 11 9 480

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Attach special tool 11 9 490 to end of torsion spring.

Support end of torsion spring protected with special tool 11 9 490 on inlet camshaft.

Fig 11: Attaching Special Tool 11 9 490 To End Of Torsion Spring

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IMPORTANT: Intermediate levers (2) are divided into individual tolerance classes.
Only intermediate levers of the same tolerance class may be fitted in a single cylinder head.
The tolerance classes are designated as illustrated with the numbers from 1 to 5.
Used intermediate levers (2) may only be reused in the same position.

Fig 12: Identifying Intermediate Lever

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Raise second end of torsion spring (1) with special tool 11 9 480.

Lift out intermediate lever (2) and set down in an orderly fashion.

IMPORTANT: Keep holding torsion spring (1) with special tool 11 9 480.

Fig 13: Raising Second End Of Torsion Spring With Special Tool 11 9 480

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Attach special tool 11 9 490 to second end of torsion spring.

Support end of torsion spring protected with special tool 11 9 490 on inlet camshaft.

Fig 14: Supporting End Of Torsion Spring Protected With Special Tool 11 9 490 On Inlet Camshaft

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Release screw (1).

Fig 15: Removing Screw

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Remove torsion spring (1) and special tool 11 9 490.

Fig 16: Removing Torsion Spring And Special Tool 11 9 490

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Remove the intermediate levers and torsion springs of cylinders 1 to 3 according to the same procedure and set down in an orderly fashion.

Unscrew nut (special tool 11 9 473).

Fig 17: Unscrewing Nut (Special Tool 11 9 473)

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IMPORTANT: Do not mix up the camshaft bearing covers of cylinders 1 to 4 and 5 to 8.

NOTE: Bearing caps are marked as illustrated with L E2 to L E5.

Remove bearing caps L E2 to L E5 and place to one side in order.

Fig 18: Removing Bearing Caps

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Lift out inlet camshaft (1).

Fig 19: Lifting Out Inlet Camshaft

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NOTE: Further tasks:
The section Removing and installing right eccentric shaft contains important installation instructions.

If necessary, replace plain compression rings (1).

IMPORTANT: Plain compression rings (1) can easily break.

Plain compression rings (1) are engaged at joint.

Press compression ring (1) on one side into groove, pull up on other side and remove catch.

Carefully pull compression ring (1) apart and remove towards front.

Fig 20: Removing Compression Ring

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NOTE: Inlet camshaft of cylinder bank 1 to 4 is marked with "EIN 14".

If necessary, replace sensor gear (1).

Release screw (2) and remove sensor gear (1).

Fig 21: Removing Sensor Gear

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