11 31 025 Removing and installing or replacing intake camshaft (N16)

Special tools required: 

• 11 4 481
• 11 9 551

Necessary preliminary tasks: 

• Remove CYLINDER HEAD COVER .
• Remove ADJUSTING UNIT  for intake camshaft.
• Remove INTERMEDIATE LEVER .
• Remove EXHAUST CAMSHAFT .

IMPORTANT:

The screws of the bearing bracket must not be opened.

Releasing the bearing bracket will result in damage to the cylinder head.

Fig 1: Precaution -- Do Not Open Screws Of Bearing Bracket

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Bearing cap marked 5  is a thrust bearing.

Release screws of bearing caps (1 to 5).

Set all bearing caps down in special tool 11 4 481 in a neat and orderly fashion.

Remove camshaft (6).

Installation note: 

Clean all bearing positions and lubricate with oil.

Fig 2: Bearing Caps Screws Tightening Sequence

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Check plain rectangular compression rings for damage.

Plastic plain rectangular compression ring: 

Installation note: 

The plastic plain rectangular compression rings are maintenance free and do not have to be replaced.

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

Fig 3: Inserting Plastic Plain Rectangular Compression Ring

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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.

Check plastic plain rectangular compression ring (1 and 2) for freedom of movement.

Fig 4: Identifying Plastic Plain Rectangular Compression Rings

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Fig 5: Identifying Designations For Intake Camshaft (IN) And Exhaust Camshaft (EX)

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Insert camshaft (E) so that IN  marking points upwards.

Position intake camshaft (E) so that cams point upwards at an angle.

Attach special tool 11 9 551 to mounting flats.

Make sure plain rectangular compression rings cable can move freely.

Fig 6: Identifying Intake Camshaft Position

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All bearing caps are identified from 5 to 10.

Observe pairing numbers (1).

Fig 7: Identifying Bearing Caps Pairing Numbers

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Tighten bearing caps from inside outwards.

Tightening torque: 11 12 7AZ .

Fig 8: Bearing Caps Screws Tightening Sequence

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Adjust VALVE TIMING .

Assemble engine.