11 31 025 Removing and installing or replacing intake camshaft (N18)

Special tools required:

IMPORTANT: It is absolutely essential to follow an exact procedure for dismantling and installing the intake camshaft.
In order to avoid incorrect timing setting, it is essential to check the locking of the camshaft adjuster and if necessary perform locking by rotating the camshaft.

Necessary preliminary work:

Remove CYLINDER HEAD COVER .
Check TIMING .
Remove CHAIN TENSIONER .
Remove INTERMEDIATE LEVERS .

IMPORTANT: Check function of camshaft adjuster locking by rotating camshaft.

To release central bolts, always use special tool 11 7 440 of exhaust camshaft.

Position the special tool 11 7 440 at the mounting flats of the exhaust camshaft and fasten it with a screw (1).

Fig 1: Identifying Exhaust Camshaft Special Tool (11 7 440)

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IMPORTANT: Check function of camshaft adjuster locking by rotating camshaft.

Position the special tool 11 7 440 on the intake and exhaust camshaft and fasten it with screws (1).

To release central bolts, always use special tool 11 7 440 .

Fig 2: Positioning Special Tool (11 7 440) On Intake And Exhaust Camshaft

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Unfasten screws (2).

Remove tensioning rail (1).

Fig 3: Identifying Tensioning Rail And Screws

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Release screw (1).

Tightening torque: 11 11 3AZ .

Fig 4: Identifying Screw

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Release central bolt (1).

Tightening torque: 11 36 1AZ .

Place the VANOS unit onto the special tool 11 4 480 .

Remove EXHAUST CAMSHAFT .

Fig 5: Identifying VANOS Unit Central Bolts

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IMPORTANT: Removed cylinder head:
When using special tool 11 9 000 , it will be necessary to remove the aluminum strip.

IMPORTANT: The screw connection of the bearing bracket may not be loosened; Risk of damage.

Fig 6: Identifying Bearing Bracket Screws STOP Label

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Release all screws on the bearing cap (1 to 5).

Tightening torque: 11 12 7AZ .

All bearing caps (1 to 5) are identified with numbers from (6 to 9).

Set down all intake camshafts (6) on the special tool 11 4 480 in neat order.

Fig 7: Identifying Bearing Caps

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Plastic plain rectangular compression ring:

Plastic plain rectangular compression rings are already pre-installed on a new camshaft.

Plastic plain rectangular compression rings (1) are maintenance-free and must be replaced if damaged.

Insert plastic plain rectangular compression ring (1) into groove of intake camshaft (2) (see arrow).

Lightly oil plastic plain rectangular compression ring (1) and rotate in direction of arrow until plastic plain rectangular compression ring (1) is positioned on the intake camshaft.

Fig 8: Inserting Plastic Plain Rectangular Compression Ring Into Intake Camshaft Groove