Charge Air System, Checking For Leaks: Procedure

-- Loosen the hose clamps -1 and 2- and remove the air duct pipe.

Fig 1: Identifying Clamps With Air Guide Pipe

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-- Remove the vent pipe for the crankcase ventilation -arrow-.

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-- Close the connections with a plug -1- from the :VAS6122 and secure using a hose clamp -2-.

-- Connect the :VAG1687/10 with the :VAG1687/14 to the turbocharger.

Fig 2: Identifying Turbocharger Testing Unit

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-- Connect the :VAG1687 to the adapter.

Prepare the :VAG1687 as Follows:

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-- Pull the pressure regulating valve -2- upward and remove completely, close the valves -3 and 4-.

-- Connect the :VAG1687 to compressed air -1- with a commercially available intermediate piece.

NOTE:

If there is water in the viewing glass -6-, drain it through the drain plug.

-- Open the valve -3-.

-- Set the pressure to 0.5 bar (7.2 psi) using the pressure regulating valve -2-.

-- Open the valve -4- and wait until the test circuit is filled. Regulate the pressure to 0.5 bar (7.2 psi) again if necessary.

-- Inspect the charge air system for poorly sealed areas by listening, feeling, using commercially available leak detection spray or by using the :VAG1842S .

NOTE:

A small quantity of air dissipates via the valves in the engine. For this reason a pressure retention test is not possible.

Information on the :VAG1842S . Refer to the Operating Instructions.

Release the pressure in the test circuit by pulling off the hose coupling before removing the adapter.