Checking/Replacing 4/2-Way Valve For VANOS

Switch off ignition. Remove plug connection from VANOS adjustment unit.
Removing VANOS solenoid valve.

Installation:
Replace seal.
Tightening torque, refer to Engine, Specifications





Move valve tappet back and forth: tappet must move freely.





Move plunger of hydraulic piston back and forth. Must be possible to move hydraulic piston easily.





If hydraulic pistons prove difficult to move, the complete VANOS adjustment unit must be replaced.