Removing and Installing/Replacing Inlet and Exhaust Adjustment Units on Right Side
11 36 048 Removing and installing/replacing inlet and exhaust adjustment units on right side (S63)Special tools required:
Important!
When the engine is shut down, the inlet and exhaust adjustment unit is normally locked in its initial position.
The situation may arise in some individual cases where this initial position is not reached and the camshaft can continue to be rotated in the adjustment range of the adjustment unit.
Where central bolts are not greased at the bolt contact points up to engine number 20024295, the adjustment gear must be replaced for safety reasons.
The central bolts is greased from engine number 20024296.
(cylinder bank 1 to 4)
Necessary preliminary tasks:
^ Read fault memory and make a documentary record
^ Remove right cylinder head cover
^ Remove right timing case cover
^ Check timing.
To release central bolts, use special tool 11 9 890 or grip at hexagon head of camshaft.
Important!
If special tool 11 9 890 can not be fitted, it is necessary when releasing the central bolt to grip the hexagon head of the respective camshafts.
Release central bolts (1 and 2) of inlet and exhaust adjustment units.
Installation:
Replace central bolts after releasing.
Important!
Check whether head of central bolt (1) is greased (see arrow).
If no grease can be seen on the bolt head of central bolt (1), the inlet and exhaust adjustment unit must be replaced for safety reasons.
Installation:
Coat contact face of central bolt (1) with copper paste.
Release hexagon socket screw.
Release special tool 11 9 900 at knurled screws and remove.
Release screws (1).
Remove upper tensioning rail (2).
Remove central bolt (1) of exhaust adjustment unit.
Installation:
Replace central bolts after releasing.
Detach exhaust adjustment unit (1) in direction of arrow from exhaust camshaft.
Feed out exhaust adjustment unit (2) from timing chain (1).
Lift out exhaust adjustment unit (2).
Remove central bolt (1) of inlet adjustment unit.
Installation:
Replace central bolts after releasing.
Detach inlet adjustment unit (1) in direction of arrow from inlet camshaft.
Feed out inlet adjustment unit (2) from timing chain (1).
Lift out inlet adjustment unit (2).
Important!
Danger of mix-up:
Intake and exhaust adjustment units are different.
Mixing up the inlet and exhaust adjustment units will cause damage to the engine.
1. Inlet adjustment unit (1) is marked with ON
2. Exhaust adjustment unit (2) is marked with OFF
Installation:
Coat contact face of central bolt (1) with copper paste.
Note:
Position of adjustment units in relation to timing chain can be freely selected.
Feed adjustment unit into timing chain and position on camshafts.
Insert central bolts (1 and 2) on adjustment units without gaps.
Release central bolts (1 and 2) by 90°.
Fit sliding rail (2) and secure with screws (1).
Tightening torque: 11 31 4AZ.
Get special tool 11 9 890 ready for securing camshafts.
Place special tool 11 9 893 on exhaust camshaft.
Fit special tool 11 9 893 on intake camshaft.
Installation:
Align exhaust and inlet camshafts in such a way that special tools 11 9 893 rest without a gap on the cylinder head.
Screw special tool 11 9 894 into cylinder head.
Press special tool 11 9 892 down with special tool 11 9 891.
Screw in special tool 11 9 900.
Pretension timing chain with special tool 11 9 900.
Preload hexagon socket screw with special tool 00 9 250 to 0.6 Nm.
Check special tools 11 9 190 for correct seating.
Tighten down central screw (1 and 2) of the adjustment units with special tool 00 9 120.
Tightening torque 11 36 1AZ.
Remove special tools 11 9 190 and 11 8 570.
Crank engine at central bolt twice in direction of rotation until engine returns to 150° before cylinder no. 1 firing TDC position.
Mount special tool 11 8 570 on vibration damper with a bolt.
Secure special tool 11 9 190 at 150° before cylinder no. 1 firing TDC position.
Check timing again.
Remove all special tools.
