Wastegate Actuator: Service and Repair

11 74 509 Replacing Both Pressure Converters For Turbocharger (S63)







Necessary preliminary tasks:
- Partially release auxiliary coolant pump for turbocharger
- Disconnect plug connection on coolant thermostat







Pressure converter, cylinders 1-4:
Disconnect plug connection (1) on pressure converter.

Installation note:
plug connection (1) must snap audibly into place.

Disconnect black vacuum hose at connection (VAC = vacuum reservoir).
Disconnect black/red vacuum hose at connection (OUT= turbocharger vacuum unit).
Unscrew nuts (2).
Tightening torque 11 65 8AZ.
Remove pressure converter.







Pressure converter, cylinders 5-8:
Disconnect plug connection (1) on pressure converter.

Installation note:
plug connection (1) must snap audibly into place.

Disconnect black vacuum hose at connection (VAC = vacuum reservoir).
Disconnect black/blue vacuum hose at connection (OUT= turbocharger vacuum unit).
Unscrew nuts (2).
Tightening torque 11 65 8AZ.
Remove pressure converter.







Check activation via BMW diagnosis system.