Camshaft: Testing and Inspection

11 31 005 Check Engine Timing Of Camshaft (N16)

Special tools required:







IMPORTANT:
Modified procedure for timing adjustment.
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 engine rotation (direction of rotation always clockwise when viewed towards timing drive side).







Necessary preliminary tasks:
- Remove cylinder head cover.
- Remove right wheel arch cover







IMPORTANT:
Danger of mixing up special tool bore.
Balance hole and special tool bore can be mixed up; all pistons must be in the 90° position.
If necessary, determine by means of spark plug bore.







IMPORTANT:
Check locking on VANOS adjustment units.
Turn camshafts at hexagon head in direction of engine rotation.
The adjustment units are locked in the initial position when the camshafts are non-positively connected to the adjustment units.
If no fixed connection to the camshaft can be established, the adjustment unit is faulty and must be replaced.







Both camshafts are in the correct installation position when the designation (IN) for inlet camshaft points upwards.
In the case of the exhaust camshaft, the designation EX must point upwards.







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







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







Position special tool 11 9 540 on mounting flats of exhaust camshaft and secure it with a screw (1).







Position special tool 11 9 540 on mounting flats of inlet camshaft and secure it with screw (1 and 2).







If necessary, adjust valve timing.
Assemble engine.