11 74 509 Replacing both pressure converters for turbocharger (N63)

Necessary preliminary work: 

• Partially release charge air cooler EXPANSION TANK .
• Partially release AUXILIARY WATER PUMP  for exhaust turbocharger (not F04).
• Disconnect plug connection at 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.

Fig 1: Identifying Plug Connection, Vacuum Hoses And Nuts (Cylinders 1-4)

Courtesy of BMW OF NORTH AMERICA, INC.

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.

Fig 2: Identifying Plug Connection, Vacuum Hoses And Nuts (Cylinders 5-8)

Courtesy of BMW OF NORTH AMERICA, INC.

Check activation via BMW diagnosis system.