11 31 034 Removing And Installing/Replacing Right Inlet Camshaft (N62 To 9/03): Removal

Removal of inlet camshaft is described separately from installation.

Remove servomotor for right eccentric shaft. . See 11 37 024 REMOVING AND INSTALLING/REPLACING SERVOMOTOR FOR RIGHT ECCENTRIC SHAFT (N62/N62TU) .

Remove ignition coils on cylinder bank 1 to 4.

Remove right cylinder head cover. See 11 12 006 REMOVING AND INSTALLING/SEALING RIGHT CYLINDER HEAD COVER (N62/N62TU) .

Remove spark plugs on cylinder bank 1 to 4.

Remove inlet and exhaust adjustment unit on right side. See 11 36 048 REMOVING AND INSTALLING/REPLACING INLET AND EXHAUST ADJUSTMENT UNITS ON RIGHT SIDE (N62/N62TU) .

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: Identifying Camshaft Lobe

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

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

Fig 2: Identifying Pretension Torsion Spring With Cable Strap

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

Fig 3: Rotating Eccentric Shaft

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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 4: Identifying Bearing Cap L E1 And Nuts

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

Fig 5: Identifying Bearing Bracket Nuts

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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: 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.

Fig 6: Identifying Rocker Arms

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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 7: Identifying Special Tool (11 9 470)

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IMPORTANT: Do not tilt bearing bracket (1).

Carefully lift out bearing bracket (1).

Fig 8: Identifying Bearing Bracket Nuts

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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 9: Identifying 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 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: Identifying 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 12: Identifying Torsion Spring And Intermediate Lever

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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 13: Identifying Torsion Spring With Special Tool

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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 14: Identifying Intermediate Levers

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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 15: Identifying Torsion Spring And Intermediate Lever

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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 16: Identifying Special Tools

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Release screw (1).

Fig 17: Identifying Screw

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

Fig 18: Identifying Torsion Spring And Special Tool

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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 19: Identifying 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 20: Identifying Bearing Caps Mark Numbers

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Lift out inlet camshaft (1).

Fig 21: Identifying Inlet Camshaft

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NOTE: Further tasks:
The section Removing and installing right eccentric shaft contains important installation instructions. See 11 37 008 REMOVING AND INSTALLING/REPLACING RIGHT ECCENTRIC SHAFT (N62 FROM 9/03 AND N62TU) .

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 22: Identifying Plain Compression Rings Groove

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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 23: Identifying Sensor Gear And Screw

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