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| Attach the universal dial gauge support -VW 387- to the turbocharger -arrow-. |
Note The values in mm refer to the read value (includes 1 mm pretension). |
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| Secure the dial gauge -VAS 6341/1- with the extension 30 mm -VAS 6341/3- and the flat probe -VAS 6341/4- to the universal dial gauge support -VW 387-. |
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| At 0 bar, tense the gauge -VAS 6341/1- to 1 mm. |
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| Position the indicator of the dial gauge -VAS 6341/1- at 0. |
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| Ensure that all of the mobile elements of the gauge move smoothly. |
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| Operate hand vacuum pump -VAS 6213- until turbocharger tester -V.A.G 1397A- indicates 460 +/- 5 mbar. |
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| The gauge should indicate between 4.1 and 4.3 mm; otherwise rotate the knurled nut until this value is indicated. |
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| Tighten the lock nut by hand. |
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| Repeat measurement procedure. |
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| Lower the pressure to 0 mbar with the pressure regulating valve -VAS 6342-. |
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| Set the dial gauge -VAS 6341/1- to 0. |
Note The following measurements should be made in sequence. In the meantime, pressure must not drop to zero. |
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| Operate hand vacuum pump -VAS 6213- until turbocharger tester -V.A.G 1397A- indicates 460 +/- 5 mbar. |
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| Read and note the value indicated by the gauge -VAS 6341/1-. |
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| Operate hand vacuum pump -VAS 6213- until turbocharger tester -V.A.G 1397A- indicates 650 to 700 mbar. |
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| Vent system via pressure control valve -VAS 6342- so that pressure reading drops to 460 +/- 5 mbar. |
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| Read and note the value indicated by the gauge -VAS 6341/1-. |
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| Add the values 1 and 2, and divide the result by 2. |
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| The result (average value) must be 5 +/- 0.25 mm. |
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| If the result (average value) is not 5 +/- 0.25 mm, correct the adjustment, tighten the locknut by hand and repeat the measurement. |
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| If an average result of 5 +/- 0.25 mm, tighten the counter nut to 9 Nm and secure using seal resin → parts catalogue. |
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