Removing and Installing/Replacing Left Exhaust Camshaft
11 31 036 Removing and installing/replacing left exhaust camshaft (S63)Special tools required:
(cylinder bank 5 to 8)
Important!
The exhaust 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 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.
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.
Remove roller tappet from bearing cap (2 and 3) of high-pressure pump and set down on special tool 11 4 480.
Remove left exhaust camshaft and set down on special tool 11 4 480.
Important!
Used rocker arms (1) may only be reused in the same position.
Note:
Rocker arms (1) are freely accessible after exhaust camshaft has been removed.
Do "not" remove rocker arms (1) on exhaust 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:
Exhaust camshaft of cylinder bank 5 to 8 is marked with "A 5-8".
Important!
Rocker arms (1) slip slightly when exhaust 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.
Install exhaust camshaft (1).
Insert exhaust 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.
Insert tappets for high-pressure pump.
Install inlet adjustment units.
Adjust valve timing.
Assemble engine.
