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

WARNING: This page is about a different variant/trim than selected.

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: Securing Special Tool (11 9 551) With Screw

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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.

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

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

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Unfasten screws (2).

Remove tensioning rail (1).

Fig 3: Identifying Tensioning Rail With 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 Sprocket Of Timing Chain And Central Bolt

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Release central bolt (3).

Tightening torque:11 36 1AZ.

Set down VANOS adjuster on special tool 11 4 480 .

Fig 6: Identifying Central Bolt

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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 ring and lock.

Fig 7: Turning Eccentric Shaft

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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 rectangular compression ring

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

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

The compression rings have catches at the joint.

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

Fig 9: Pressing Plain Compression Rings

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Make sure plain compression rings (1) can move freely.

Installation:

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

Plastic 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 Rectangular Compression Ring Into Groove Of Intake Camshaft