Wastegate Actuator: Service and Repair

11 74 509 Replacing both pressure converters for turbocharger (N74)





Necessary preliminary work:
^ Remove engine cover.





Pressure converter, cylinders 1-6:
Disconnect plug connection (3) on pressure converter.

Installation note:
Plug connection (3) must snap audibly into place!

Disconnect black vacuum hose (1) at connection (VAC = vacuum reservoir).

Disconnect black vacuum hose (2) at connection (OUT = vacuum unit of exhaust turbocharger).

Undo screws (4 and 5)

Tightening torque 11 00 2AZ.

Remove pressure converter.





Pressure converter, cylinders 7-12:
Disconnect plug connection (3) on pressure converter.

Installation note:
Plug connection (3) must snap audibly into place!

Disconnect black vacuum hose (1) at connection (VAC = vacuum reservoir).

Disconnect black vacuum hose (2) at connection (OUT = vacuum unit of exhaust turbocharger).

Undo screws (4 and 5)

Tightening torque 11 00 2AZ.

Remove pressure converter.





Check activation via BMW diagnosis system.