Removing and Installing/Replacing Inlet Camshaft

11 31 025 Removing and installing/replacing intake camshaft (N51)

Special tools required:





Important!
Aluminum-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminum screws/bolts exclusively.
Aluminum screws/bolts must be replaced each time they are released.
Aluminum screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminum screws/bolts are not magnetic.
Jointing torque and angle of rotation must be observed without fail (risk of damage).





Necessary preliminary tasks:
^ Remove cylinder head cover.
^ Remove adjusting unit for intake camshaft.
^ Remove intermediate lever.
^ Adjust valve timing.





Bearing cap (1) is a thrust bearing.

Release screws of bearing caps (1 and 2).

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

All bearing caps are identified from 1 to 6.

Tightening torque: 11 31 1AZ.

Lift out camshaft (2).

Installation:
Clean all bearing points and lubricate with oil.





Check plain compression rings (1) for damage and replace if necessary.





Important!
Plain compression rings (1) can easily break.

The plain compression rings have catches at the joint.

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





Important!
Both camshafts have different identifications.
Mixing up the two camshafts will result in engine damage.
A Exhaust camshaft.
E Intake camshaft

Insert camshaft (1) so that part number on mounting flats points upwards.





Position intake camshaft (1) so that cams point upwards at an angle.

Attach special tool 11 4 281 to mounting flats.





Assemble engine.