11 31 032 Removing and installing/replacing left inlet camshaft (N62 to 9/03): Removal

Removal of inlet camshaft is described separately from installation.

Remove servomotor for left eccentric shaft. Refer to 11 37 022 Removing and installing/replacing servomotor for left eccentric shaft (N62) .

Remove ignition coils on cylinder bank 5 to 8.

Remove left cylinder head cover. Refer to 11 12 005 Removing and installing / sealing left cylinder head cover (N62 / N62TU) .

Remove spark plugs on cylinder bank 5 to 8.

Remove inlet and exhaust adjustment unit on left side. Refer to 11 36 047 Removing and installing/replacing inlet and exhaust adjustment units on left side (N62) .

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 against direction of rotation until lettering (1) on 8th cylinder points upwards in cylinder axis and cam is horizontal.

Fig 1: Rotating Inlet Camshaft

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Rotate eccentric shaft at dihedral head as illustrated in order to reduce tension on torsion spring (1).

Fig 2: Rotating Eccentric Shaft At Dihedral Head

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Pretension torsion spring (1) with a cable strap (2), feed out from roller (3) and carefully relieve tension.

Rotate eccentric shaft at dihedral head as shown in illustration back to minimum stroke position.

Fig 3: Rotating Eccentric Shaft Back To Minimum Stroke Position

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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 5 to 8 with R E1 to R E5 from inlet side.

Release nuts and remove bearing cap R E1.

Fig 4: Removing Bearing Cap R E1

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

Fig 5: Removing Nuts Of Bearing Bracket

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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.

Fig 6: Locating Rocker Arm On Inlet Side

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IMPORTANT: Rockers 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.

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 7: Clamping Special Tool Vise

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IMPORTANT: Do not tilt bearing bracket (1).

Carefully lift out bearing bracket (1).

Fig 8: 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.

Fig 9: Placing Bearing Bracket

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

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 10: Identifying Lower Section Of Bearing Bracket

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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 11: Removing Eccentric Shaft Sensor

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NOTE: Removal of the intermediate levers and torsion springs is described on the 8th cylinder. The same procedure is applicable to cylinders 5 to 7.

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

Fig 12: Raising One End Of Torsion Spring

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

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

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

Fig 13: Attaching Special Tool To End Of Torsion Spring

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

IMPORTANT: Intermediate levers (2) are divided into individual tolerance classes.

Fig 14: Identifying Intermediate Levers

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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.

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

Fig 15: Raising Second End Of Torsion Spring

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

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

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

Fig 16: Attaching Special Tool To Second End Of Torsion Spring

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

Release screw (1).

Fig 17: Releasing Screw

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Remove torsion spring (1) and special tool 119 490.

Fig 18: Removing Torsion Spring

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Remove the intermediate levers and torsion springs of cylinders 5 to 7 according to the same procedure and set down in an orderly fashion.

Unscrew nut (special tool 11 9 473).

Fig 19: Removing Nut

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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 R E2 to R E5.

Fig 20: Identifying Bearing Cap Marks

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

Lift out inlet camshaft (1).

Fig 21: Lifting Out Inlet Camshaft

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NOTE: Further tasks:
The section Removing and installing left eccentric shaft contains important installation instructions. Refer to 11 37 006 Removing and installing/replacing left eccentric shaft (N62 from 9/03) .

If necessary, replace plain compression rings (1).

Fig 22: Identifying Compression Rings

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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.

NOTE: Inlet camshaft of cylinder bank 5 to 8 is marked with "EIN 58".

Fig 23: Identifying Inlet Camshaft Marking

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If necessary, replace sensor gear (1).

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