Removing and Installing/Replacing Inlet Camshaft

11 31 025 Removing and installing/replacing intake camshaft (N52T)

Special tools required:





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





Necessary preliminary work:
^ Remove cylinder head cover
^ Check timing
^ Remove intake camshaft adjuster
^ Remove intermediate lever





Note:
All bearing caps (2) are identified with numbers from 1 to 6.

Bearing cap (1) is a thrust bearing.

Release bearing cap (1).

Release screws on bearing caps (2) 1 to 6.

Tightening torque 11 31 9AZ.

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





Remove intake camshaft (2) towards top.

Installation note:
Clean all bearing points and lubricate with oil.

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





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

Plain rectangular compression rings (1) are engaged at joint.

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

Installation note:
Install compression ring on new intake camshaft.





Important!
Markings of intake and exhaust camshafts are different.
Mixing up the intake and exhaust camshafts will result in engine damage.
A Exhaust camshaft.
E Intake camshaft





Insert intake 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.