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

Special tools required:

11 4 480
11 9 000
11 9 551
11 9 552
11 9 661
11 9 662

IMPORTANT: It is absolutely essential to follow an exact procedure for removing and installing the intake 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:

Remove cylinder head cover .
Check timing .
Remove chain tensioner .

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

Position special tool 11 9 551 on twin surface of exhaust camshaft.

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

Fig 1: Identifying Special Tool (11 9 551) And Screw

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

Mount special tool 11 9 551 on inlet and exhaust camshafts.

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

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

Fig 2: Mounting Special Tool (11 9 522) On Cylinder Head

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Release screws (2).

Remove clamping rail (1).

Fig 3: Identifying Clamping 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 Timing Chain, Sprocket Wheel And Central Bolt

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Release central bolt (3).

Tightening torque 11 36 1AZ

Set down VANOS adjustment unit 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 And Bearing Caps Screws

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Metal 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.

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..

Fig 9: Replacing Compression Rings

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Plastic rectangular compression ring:

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

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 Intake Camshaft Groove