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 1: Identifying Vacuum Line

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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 2: Sealing Stop Cock

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Determine gap dimension.

Gap dimension between turnbuckle and adjusting lever.

Fig 3: Identifying Gap Dimension Between Turnbuckle And Adjusting Lever

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Seal off wastegate valve (1) by hand in direction of arrow up to stop.

The turbocharger must be replaced if a 1.5 mm drill bit can be inserted as pictured.

Fig 4: Sealing Off Wastegate Valve

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The turbocharger is OK if a 1.5 mm drill bit cannot be inserted or can only be inserted at an angle as pictured.

Fig 5: Identifying Drill Bit Dimension

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Unfasten screws (1 and 3).

Tightening torque. See 11 65 11AZ in SUPERCHARGER WITH CONTROL .

Installation: 

Replace vacuum unit 2 (wastegate valve)  .

Fig 6: Identifying Screws

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