11 31 071 Checking Camshaft Timing on Right Side
11 31 071 Checking camshaft timing on right side (S63)Special tools required:
Important!
The timing can only be checked with special tool 11 9 900.
The timing may be misinterpreted if it is checked without special tool 11 9 900.
Cylinders 1-4:
Necessary preliminary tasks:
^ Remove right cylinder head cover
^ Remove fan cowl with electric fan
^ Remove belt pulley for A/C system
^ Remove right chain tensioner
Mount special tool 11 9 900 at position of chain tensioner.
Preload hexagon socket screw with special tool 00 9 250 to 0.6 Nm.
Note:
Marking (MP = Mounting Position) is important for installing special tool 11 8 570.
MP = 150° before cylinder no. 1 firing TDC position.
Position special tool 11 8 570 with dihedron on vibration damper in such a way that it can be secured with bolt (1) at the MP marking.
Note:
Setting groove on crankcase, see arrow.
Crank engine at central bolt.
Secure vibration damper with special tools 11 8 570 and 11 9 190 at 150° before cylinder no. 1 firing TDC position.
With cylinder no. 1 at 150° before firing TDC position, cams on exhaust camshaft (A) at cylinder no. 1 point at an angle upwards.
Cams on inlet camshaft (E) point at an angle downwards.
Note:
For purposes of clarity, the graphic shows the inlet and exhaust adjustment units removed.
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.
In order to avoid incorrect timing adjustment, it is essential to check the locking of the adjustment unit and if necessary perform locking by rotating the camshafts.
Checking locking of inlet and exhaust adjustment units in initial position:
Gripping hexagon head (2) of camshafts with a fork wrench (1), carefully try to rotate camshafts against direction of rotation.
The inlet and exhaust adjustment units are locked in the initial position when the camshafts are non-positively connected to the adjustment units.
Note:
Graphic corresponds to cylinders 5-8.
Important!
If the inlet or exhaust adjustment unit of the camshafts "can not" be locked as described, the adjustment unit is faulty and must be replaced.
Fit special tool 11 9 893 on exhaust camshaft and check timing adjustment.
Note:
Timing is correctly adjusted when special tool 11 9 893 rests without a gap on cylinder head.
Fit special tool 11 9 893 on intake camshaft and check timing adjustment.
Note:
Timing is correctly adjusted when special tool 11 9 893 rests without a gap on cylinder head.
If necessary, adjust camshaft timing on right side.
Remove all special tools.
Assemble engine.
