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

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 intake silencer housing. See 13 71 000 REMOVING AND INSTALLING/REPLACING THE INTAKE SILENCER HOUSING (M57T2 WITH AND WITHOUT SCR) .

Slacken nut (2).

Fig 1: Loosening Nut

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Detach vacuum line (Blue) from vacuum control unit.

Release all hoses and cable connections on vacuum control unit.

Fig 2: Identifying Hoses And Cable Connections Of Vacuum Control Unit

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Release screws (1).

Lift out vacuum control unit.

Fig 3: Identifying Vacuum Control Unit Screws

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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.

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

Fig 4: Measuring Vacuum Pressure

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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.

Fig 5: Sealing Stop Clock

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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.

Fig 6: Identifying Vacuum Lines And Shutoff Valve

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

Fig 7: Turning Flap Control Of Main Control Flap

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

Fig 8: Adjusting Nut

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Pretension linkage on vacuum control unit.

Installation:

Mark special tool 11 6 050 with a coloured line.

Pre-tension adjusting nut on linkage with special tool 11 6 050 by 4 turns .

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

Fig 9: Pre-Tensioning Adjusting Nut On Linkage Using Special Tool (11 6 050)

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

Check function of DDE.