Camshaft: Testing and Inspection

11 31 005 Checking camshaft timing (N18)

Special tools required:





Important!
Modified procedure for timing.
The timing is not determined at firing TDC of cylinder no. 1.
All pistons are in the 90° position.
Check locking of adjustment units.
Observe direction of rotation (direction of rotation always clockwise when viewed towards timing drive side).





Necessary preliminary work:
^ Remove cylinder head cover.





Important!
Risk of mixing up dowel hole.
The balance hole and dowel hole can be mixed up; all pistons must be in the 90° position.
If necessary, determine by means of spark plug bore.

Rotate crankshaft at central bolt.

Position crankshaft with special tool 11 9 590.

Do not remove special tool 11 9 590 during repair work.





Important!
Check locking on VANOS unit.
Attempt to rotate camshaft in direction of rotation at hexagon head.
The adjustment unit is locked in the initial setting when the camshaft is non-positively connected to the adjustment unit.
The adjustment unit is faulty if no fixed connection to the camshaft is established.





Both camshafts are in the correct installation position when the designation (IN) for intake camshaft points upwards.

In the case of the exhaust camshaft, the designation (EX) must point upwards.





Position of intake camshaft (E) points at an angle to the left in an upper outward direction.





Position of exhaust camshaft (A) points at an angle to the right in an upper outward direction





11 7 440 Position special tool (exhaust) on the mounting flats of exhaust camshaft and secure with a screw (1).





Attach the special tool 11 7 440 on the cylinder head.

Set the intake of the special tool 11 7 440 at the mounting flats of the intake camshaft (positioning) and fasten with two screws (1).





If necessary, adjust valve timing.