Charge Air System, Checking For Leaks

WARNING: This page is about a different car, the 2023 Volkswagen Atlas. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Turbo System Tester Kit:V.A.G 1687

Fig 1: Identifying Turbo System Tester Kit
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Engine Bung Set:VAS 6122

Fig 2: Engine Bung Set
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Procedure

Fig 3: Identifying Clamps With Air Guide Pipe

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

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

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-- Close the connections with a plug -1- from the Engine Bung Set and secure using a hose clamp -2-.

-- Connect the Turbo System Tester Kit - Adapter 10:V.A.G 1687/10 to the turbocharger using the Turbo System Tester Kit - Adapter:V.A.G 1687/14 .

Fig 4: Identifying Turbocharger Testing Unit

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-- Connect the Turbo System Tester Kit:V.A.G 1687 to the adapter.

Prepare the Turbo System Tester Kit:V.A.G 1687 as follows:

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

-- Connect the Turbo System Tester Kit:V.A.G 1687 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 (7.25 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 (7.25 psi) again if necessary.

-- Inspect the charge air system for leaks by listening, feeling and using commercially available leak detection spray or using the Ultrasonic Tester:VAG1842S .

NOTE:

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

Refer to the appropriate Operating Instructions for information on using the Ultrasonic Tester:V.A.G 1842S .

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

Assembling

Assembly is performed in reverse order.