11 65 580 Replacing vacuum unit (wastegate valve) (N54): Notes

WARNING: This page is about a different car, the 2010 BMW X6, 2009 BMW X6, and 2008 BMW X6. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Overpressure and vacuum lines are identified by the size of the seals and colour-coded Red and Blue and must not be mixed up with each other.
Build up pressure with Blue color.
Generate vacuum pressure with Red color.
Check ease of movement between turnbuckle and pin of adjusting lever (ensure rectangularity).

Note on ordering:

Workshop equipment
Workshop planning
Workshop equipment catalogue
Measuring and test equipment
No. 81 29 0 426 464

Necessary preliminary tasks:

Prepare BMW diagnosis system
Start diagnosis program
Perception:
1. Noises at turbocharger (clanking)
or Fault memory entry:
1. Drive
2. Engine electronics
3. Air supply
4. Boost pressure control
Remove both exhaust turbocharger (1-3) or turbocharger (4-6)

Release locking clip (2).

Disengage linkage of vacuum unit (wastegate valve).

Fig 1: Identifying Locking Clip

Courtesy of BMW OF NORTH AMERICA, INC.

Check linkage and valve for wear.

Connect vacuum line (1) to vacuum unit (wastegate valve).

Vacuum linkage must retract to stop.

Wastegate valve must be sealed off by hand.

Fig 2: Identifying Vacuum Line

Courtesy of BMW OF NORTH AMERICA, INC.

Release lock nut on controller (1).

Press setting with measurement.

Determine ambient pressure
Seal stop cock (2) in direction of arrow
Set controller (1) to 500 ± 10 mbar below ambient pressure (e.g. 980 - 500 = 480 mbar).

Open stop cock (2) again.

Wastegate linkage closes.

Fig 3: Identifying Controller And Stop Cock