Wastegate: Service and Repair

11 65 075 - Removing and installing/replacing vacuum control unit for turbine control flap (M57T2 TOP)





Special tools required:
- 11 6 050 11 6 050 Socket Wrench Socket WAF 10






Warning!
Scalding hazard!

Only perform these tasks on an engine that has cooled down.





Important!
If the turbocharger or the vacuum control unit is released, it will be necessary to adjust the vacuum control unit.

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 colour.

Generate vacuum pressure with Red colour.





Necessary preliminary tasks:
- Remove air cleaner housing.





Slacken nut (2).





Detach vacuum line (Blue) from vacuum control unit.

Release all hoses and cable connections on vacuum control unit.





Release screws (1).

Lift out vacuum control unit.





Adjusting vacuum control unit for main control flap:

Prepare special tool 81 29 0 426 464.

Generate vacuum pressure with Red colour.

Connect diagnosis tester or GT 1.

Measurement: Select pressure sensor 25 bar.





Vacuum pressure measurement:

Prepare BMW diagnosis system on vacuum diagnosis unit.

1. - Screw in pressure sensor.
2. - Connect 12V battery cables (2) to vehicle battery positive and negative.
3. - Connect 12V battery cables (3) to vehicle battery positive and negative (pump operation max. 3 mins.).
4. - Controller for vacuum connection.
5. - Vacuum connection (Red).





Calibration for vacuum pressure measurement:

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 200±10 mbar below ambient pressure (e.g. 0.980 - 0.200 = 0.780 bar).





Detach vacuum line (2) - coloured Blue - from pressure transducer (1), see arrow.

Connect vacuum line (2) - coloured Blue - to vacuum line (3) - coloured Red.

Reopen shutoff valve (2) on special tool 82 29 0 426 464.

The linkage on the vacuum control unit is now actuated.





Turn flap control (1) of main control flap in direction of arrow (clockwise) to closed.





Bring adjustment nut into contact with linkage (1), see arrow.





Pretension linkage on vacuum control unit.

Installation Note:
Mark special tool 11 6 050 11 6 050 Socket Wrench Socket WAF 10 with a coloured line.

Pretension adjustment nut on linkage with special tool 11 6 050 11 6 050 Socket Wrench Socket WAF 10 by 4 turns.

After adjusting linkage, secure with lock nut (1).





Function test of turbine control flap, refer to Test module, turbine control flap.

Check function of DDE.