11 31 025 Removing and installing/replacing inlet camshaft (N52)
Special tools required:
- 11 4 281
- 11 4 481
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.
The end faces of aluminium screws/bolts are painted blue for the purposes of reliable identification.
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 inlet 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 tidy and orderly fashion.
All bearing caps are identified from 1 to 6.
For tightening torque refer to 11 31 1AZ in 11 31 CAMSHAFT (N52) .
Lift out camshaft (2).
Installation:
Clean all bearing points and lubricate with oil.
Check plain compression rings (1) for damage and replace if necessary.
If necessary, replace plain compression rings (1).
The plain compression rings have catches at the joint.
Press plain compression rings (1) apart upwards and downwards and removed towards front.
Mixing up the two camshafts will result in engine damage.
A Exhaust camshaft.
E Inlet camshaft.
Insert camshaft (1) so that part number on twin surface points upwards.
Position inlet camshaft (1) so that cams point upwards at an angle.
Attach special tool 11 4 281 to twin surface.
Assemble engine.