Removing and Installing/Replacing Right Exhaust Camshaft

11 31 038 Removing and installing/renewing right exhaust camshaft (S63)

Special tools required:





Cylinders 1-4:

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

Necessary preliminary tasks:
^ Remove right high-pressure pump





^ Remove right cylinder head cover
^ Remove right exhaust adjustment unit





Important!
No cam on the exhaust 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 exhaust camshaft (2) at dihedron with a fork wrench into a suitable position.





Note:
The intake camshaft of cylinder bank 5-is marked "E 5-8".

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





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

Remove roller tappet from bearing caps (2 and 3) of high-pressure pump and lay down in special tool 11 4 480.

Remove left exhaust camshaft and lay down in special tool 11 4 480.





Important!
Rocker arms (1) of can 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.





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.





Coat all bearing points with engine oil.





Install exhaust camshaft (1).

Turn exhaust camshaft (1) until cams point to side at cylinder no. 1 as shown in graphic.





Important!
Bearing caps of cylinders 1-4 and cylinders 5-8 must not be interchanged.
All bearing caps are coded and can only be installed in one position.

All bearing caps are marked with letters and numbers:

L = Cylinder bank 1-4.

R= Cylinder bank 5-8.

E = Intake side

A = Exhaust side

1 = Marking, bearing point, from 1 to 5





Insert all bolts.

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

Tightening torque 11 31 6AZ.

Tightening torque 11 31 7AZ.





Install right inlet and exhaust adjustment units.

Adjust valve timing.

Assemble engine.