Camshaft: Adjustments
11 31 505 Adjusting camshaft timing (N54, N54T)Special tools required:
Important!
Risk of damage!
To open the central bolt at the camshaft, grip hexagon on rear of camshaft.
Necessary preliminary tasks:
^ Remove cylinder head cover
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.
Fit special tool 11 4 283 with screws (1).
Fit special tool 11 4 281 on special tool 11 4 283.
Important!
If special tool 11 4 281 cannot be installed, the camshaft must be rotated at the hexagon head at the rear.
With cylinder No. 1 in ignition TDC position, cams of exhaust camshaft (2) and intake camshaft (1) at 6th cylinder point downwards at an angle.
Note:
If the timing is adjusted while the engine is installed, the position of the camshaft can only be checked with a mirror.
Release central bolt (1) of exhaust camshaft.
Installation note:
Replace screw (1).
Tightening torque 11 36 1AZ.
Release central bolt (2) of inlet camshaft.
Installation note:
Replace screw (2).
Tightening torque 11 36 1AZ.
Rotate increment wheels until retaining pins on special tool 11 8 520 match up.
Push special tool 11 8 520 onto cylinder head.
Secure special tool 11 8 520 with bolts (1 and 2).
Note:
Bolts M6 x 45 (1 and 2) with captive washer.
Remove chain tensioner (1).
Screw special tool 11 9 340 into cylinder head.
Pre-tension timing chain with special tool 00 9 250 to 0.6 Nm.
Tighten central bolts (2 and 3) with special tool 00 9 120.
Tightening torque 11 36 1AZ.
Remove all special tools.
Assemble engine.
