Camshaft: Testing and Inspection

11 31 005 Checking camshaft timing (N54, N54T)

Special tools required:





Necessary preliminary tasks:
^ Remove cylinder head cover
^ Remove front underbody protection

Remove fastener (1) in direction of arrow.

Installation note:
Install fastener (1) with bore facing outwards.








Rotate crankshaft at central bolt into TDC position.

Slide in special tool 11 0 300 in direction of arrow and block crankshaft.

Important!
On engines with automatic transmissions, there is shortly before the special tool bore for the TDC position a large bore which can be confused with the special tool bore.

If the flywheel is secured in the correct bore with special tool 11 0 300, the engine can no longer be moved at the central bolt.





With 1st cylinder in ignition TDC position, cams of intake camshaft (1) at 6th cylinder point downwards at an angle.

With 1st cylinder in ignition TDC position, cams of exhaust camshaft (2) at 6th cylinder point downwards at an angle.

Roller cam follower is not actuated.

Note:
If the timing is checked while the engine is installed, the position of the camshaft can only be checked with a mirror.





Secure special tool 11 4 283 on cylinder head with screws (1).

Mount special tool 11 4 281 on intake and exhaust camshafts.

If the special tools 11 4 281 cannot be attached, the timing must be adjusted.





Remove all special tools.

Assemble engine.