Turbocharger Vacuum Diaphragm, Adjusting: Adjusting

TIP:

It is necessary to adjust the diaphragm only if it has been removed.

-- Remove hose -arrow- from vacuum diaphragm on turbocharger.

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-- Loosen the clamp over the linkage on the turbocharger.

-- Loosen the lock nut -2-.

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-- Adjust the bypass flap -1- using the knurled nut -arrow- so that the flap can still just be turned by hand.

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-- Install the lock nut hand-tight.

-- Connect the :VAS6213 and :VAS6342 to the vacuum diaphragm and to connection II on the : VAG1397A , as illustrated.

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-- Close the :VAS6342 on the lever -1-.

-- Set the slide ring -1- on the :VAS6213 in position -B- for "pressure".

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-- Switch the :VAG1397B and set the slide switch to position II.

-- Secure the :VW387 onto the turbocharger -arrow-.

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TIP:

The mm specifications apply to the value read out (includes 1 mm pre-load).

-- Secure the :VAS6341/1 with the :VAS6341/3 and :VAS6341/4 to the :VW387 .

-- Set the :VAS6341/1 to 1 mm tension at 0 bar.

-- Turn the :VAS6341/1 display to 0.

-- Check the dial gauge for ease of movement.

-- Operate the :VAS6213 until the :VAG1397B displays 460 ± 5 mbar (6.67 ± 0.07 psi).

-- 4.1 mm to 4.3 mm must appear in the dial gauge; if not, turn the knurled nut until the value is displayed.

-- Tighten the lock nut hand-tight.

-- Repeat the measurement.

-- Reduce pressure to 0 mbar via :VAS6342 .

-- Set the : VAS6341/1 to 0.

TIP:

The following measurements must be performed in one sequence. In the meantime, the pressure must not dissipate to 0.

-- Operate the :VAS6213 until the :VAG1397B displays 460 ± 5 mbar 460 ± 5 mbar (6.67 ± 0.07 psi).

-- Read and note the value on the :VAS6341/1 .

-- Operate the :VAS6213 until the :VAG1397B displays 650 mbar to 700 mbar (9.42 psi to 10.15 psi).

-- Reduce the pressure to 460 ± 5 mbar (6.67 ± 0.07 psi) via :VAS6342 .

-- Read and note the value on the :VAS6341/1 .

-- Add value 1 and 2 together and divide by two.

-- The result (mean value) must be 5 ± 0.25 mm.

-- If the result (mean value) is not 5 ± 0.25 mm, correct the adjustment, tighten the lock nut by hand and repeat the measurement.

-- If the result (average) is 5 ± 0.25 mm, tighten the lock nut and secure with sealing wax. Refer to parts information for the correct sealing wax.

-- Secure the locking plate -1- over vacuum diaphragm linkage.

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