Removing and Installing/Replacing Inlet and Exhaust Adjustment Units

11 36 046 - Removing and installing/replacing inlet and exhaust adjustment units (N51)

Special tools required:

Necessary preliminary tasks:
- Remove cylinder head cover Service and Repair.
- Check timing Testing and Inspection.

Important!
To release central bolts on adjustment units and camshafts.
Fit special tool 11 4 280.

Fit special tool 11 4 283 with screws (1).

Fit special tool 11 4 281 on special tool 11 4 283.

Important!
Special tool 11 4 282 must be fitted underneath on inlet camshaft.

Release chain tensioner (2).
Tightening torque: 11 31 5AZ Mechanical Specifications.
Release central bolt on inlet/exhaust adjustment units (1).
Tightening torque: 11 36 1AZ Mechanical Specifications.

Note:
Illustrations in CAD and do not show special tools.

Detach exhaust adjustment unit (1) from exhaust camshaft.
Detach inlet adjustment unit (2) from inlet camshaft.

Installation:
To facilitate removal and installation of adjustment units, turn sensor gears at cutout downwards.

Important!
- Danger of mixing up adjustment units.
- Mixing up the adjustment units will result in engine damage.

The inlet and exhaust adjustment units are different.
VANOS is marked with AUS and EX for the exhaust camshaft.
VANOS is marked with EIN and IN for the inlet camshaft.
Sensor gears can be fitted alternatively.

Fit both adjustment units on camshafts.
The installation position of the adjustment units can be freely selected.
Insert screws (1).
Tightening torque: 11 36 1AZ Mechanical Specifications.

Important!
To secure central bolts on adjustment units and camshafts.
Fit special tool 11 4 280.

Note:
Illustrations in CAD and do not show special tools.

Important!
Incorrect installation possible.

Press clamping rail (1) by hand against timing chain and make sure timing chain is guided in clamping rail (1).

Note:
Schematic representation on removed chain drive.

Adjust valve timing Adjustments.

Fit chain tensioner Service and Repair.

Assemble engine.