Removing and Installing/Replacing Left Inlet Camshaft

11 31 032 Remove and install/replace left intake camshaft (S63)

Special tools required:

(cylinder bank 5 to 8)





Important!
The intake camshaft must first be rotated in such a way that the camshaft is free from tension when the bearing caps are released (risk of damage).





Necessary preliminary tasks:
^ Remove left cylinder head cover.
^ Check timing.
^ Remove left inlet adjustment unit.





Important!
No cam on the inlet camshaft is permitted to press directly onto a roller cam follower.
With cylinder no. 1 at 150° before firing TDC there is no piston in the TDC position.

Rotate left inlet camshaft at dihedron with a fork wrench (1) into a suitable position.





Release bolts of camshaft bearings in sequence (10 to 1) in 1/2 turns.

Set down all bearing caps in a tidy and orderly fashion on special tool 11 4 480.

Intake camshaft

Important!
Used rocker arms (1) may only be reused in the same position.





Note:
Rocker arms (1) are freely accessible after inlet camshaft has been removed.

Do "not" remove rocker arm (1) on intake side.





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

If necessary, replace plain compression rings (1).

Press compression ring (1) on one side into groove, pull up on other side and remove catch.

Carefully pull plain rectangular compression ring (1) apart and remove towards front.

Ends of compression rings (1) point upwards.

Make sure compression rings (1) are engaged at ends.

Note:
Inlet camshaft of cylinder bank 5 to 8 is marked with "E 5-8".








Important!
Rocker arms (1) slip slightly when inlet camshaft is fitted.
Make sure rocker arms (1) are secured as illustrated on hydraulic valve clearance compensating elements and on valves.

Align all rocker arms (1) straight.





Coat all bearing points with engine oil.

Insert inlet camshaft.

Insert inlet camshaft (1) so that cams point to side at cylinder 5 as shown in picture.








Important!
Do not mix up the bearing caps of cylinders 1 to 4 and 5 to 8.
All bearing caps are coded and can only be installed in one position.

All bearing caps are marked:

L = Cylinders 1 - 4.

R= Cylinders 5 - -8.

E = Intake side

A = Exhaust side

1 = designation from 1 to 5





Insert all bolts.

Tighten down bolts in sequence (1 to 10) in 1/2 turns.

Tightening torque: 11 31 6 AZ.

Tightening torque: 11 31 7 AZ.





Install inlet adjustment units.

Adjust valve timing.

Assemble engine.