11 31 025 Removing and installing/replacing inlet camshaft (N14)

Special tools required:

IMPORTANT:

It is absolutely essential to follow an exact procedure for removing and installing the inlet camshaft.

In order to avoid incorrect timing adjustment, it is essential to check the locking of the adjustment unit and if necessary perform locking by rotating the camshaft.

Necessary preliminary tasks:

To release central bolts, always use special tool 11 9 551 of exhaust camshaft.

Position special tool 11 9 551 on mounting flats of exhaust camshaft.

Secure special tool 11 9 551 with a screw (1).

Fig 1: Releasing Central Bolts Using Special Tool (11 9 551)

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IMPORTANT: Check function of adjustment unit locking by rotating camshaft.

Position special tool 11 9 551 on intake and exhaust camshafts.

Screw in 11 9 552 special tool on cylinder head with a screw.

Fig 2: Positioning Special Tool (11 9 551) On Intake And Exhaust Camshafts

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To release central bolts, always use special tool 11 9 551 .

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 (3).

Tightening torque: 11 36 2AZ .

Feed out sprocket wheel (2) from timing chain (1) towards front.

Fig 5: Identifying Camshaft Sprocket And Timing Chain

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Release central bolt (3).

Tightening torque: 11 36 1AZ .

Set down VANOS unit on special tool 11 4 480 .

Fig 6: 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 profile insert.

Screw special tool 11 9 661 with special tools 11 9 662 into spark plug holes.

Turn eccentric shaft (1) in direction of arrow and lock.

Fig 7: Screwing Special Tool (11 9 661) With Special Tools (11 9 662)

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Release all screws on bearing caps (1).

Tightening torque: 11 12 6AZ .

Bearing cap (2) is a thrust bearing and has the number (5).

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

Fig 8: Identifying Bearing Caps

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Metal plain rectangular compression ring:

IMPORTANT:

Plain rectangular compression rings (1) can easily break.

Only replace plain rectangular compression rings (1) when they are broken.

The plain rectangular compression rings have catches at the joint.

Fig 9: Pressing Plain Compression Rings

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Press plain rectangular compression rings (1) apart upwards and downwards and removed towards front.

Make sure plain rectangular compression rings (1) have freedom of movement.

Installation note:

When intake camshafts are inserted, no joint must point to a separating joint..

Plastic plain rectangular compression ring:

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

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

Fig 10: Inserting Plastic Plain Rectangular Compression Ring Into Intake Camshaft Groove