Camshaft: Adjustments

11 31 505 - Adjusting camshaft timing (N54)





Special tools required:
- 00 9 120 00 9 120 Torque Angle Measuring Dial
- 00 9 250 00 9 250 Torque Wrench with Flexible Extension
- 11 0 300 11 0 300 Mandrel
- 11 4 281
- 11 4 283
- 11 8 520 11 8 520 Gauge with Screws
- 11 9 340 11 9 340 Device





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 Service and Repair





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 secure 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 the 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 firing TDC position, cams of exhaust camshaft (2) and inlet camshaft (1) at cylinder no. 6 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 11 36 Variable Camshaft Control VANOS.

Release central bolt (2) of inlet camshaft.

Installation Note:
Replace screw (2).

Tightening torque 11 36 1AZ 11 36 Variable Camshaft Control VANOS.





Rotate sensor gears until locating pins on special tool 11 8 520 11 8 520 Gauge with Screws match up.

Push special tool 11 8 520 11 8 520 Gauge with Screws onto cylinder head.

Secure special tool 11 8 520 11 8 520 Gauge with Screws with bolts (1 and 2).

Note:
M6 x 45 bolts (1 and 2) with captive shim.





Remove chain tensioner Service and Repair(1).

Screw special tool 11 9 340 into cylinder head.

Pretension 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 11 36 Variable Camshaft Control VANOS.





Remove all special tools.

Assemble engine.