A4 Sedan L4-2.0L Turbo (BPG) (2005)
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Rotate Dial Gauge 0-30 mm VAS 6341/1 display to 0.
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Check dial gauge for ease of movement.
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Operate Hand Vacuum Pump VAS 6213 until Turbocharger Tester V.A.G 1397A shows 350 ± 5 mbar.
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Dial gauge must display between 4.1 mm and 4.33, otherwise, turn knurled nut until value is displayed.
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Hand tighten lock nut.
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Repeat measurement.
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Reduce pressure to 0 mbar via Pressure Control Valve VAS 6342 .
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Set Dial Gauge 0-30 mm VAS 6341/1 to 0.
NOTE: The following measurements must be performed in one sequence. In the meantime, pressure must not dissipate to 0.
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Operate Hand Vacuum Pump VAS 6213 until Turbocharger Tester V.A.G 1397A shows 350 ± 5 mbar.
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Read value on dial indicator VAS 6341/1 and note.
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Operate Hand Vacuum Pump VAS 6213 until Turbocharger Tester V.A.G 1397A displays 650 mbar to 700 mbar.
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Reduce pressure to 350 ± 5 mbar via Pressure Control Valve VAS 6342.
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Read value on dial indicator VAS 6341/1 and note.
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Add value 1 and 2 and divide by 2.
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The result (mean value) must be 5 ± 0.25 mm.
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If result (mean value) is not 5 ± 0.25 mm, correct adjustment, tighten lock nut hand-tight and repeat measurement.
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If result (average) is 5 ± 0.25 mm, tighten lock nut and secure with sealing wax.
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Secure securing plate - 1 - over vacuum diaphragm linkage.