Turbocharger: Testing and Inspection

Charge Air System, Checking for Leaks

Special tools, testers and auxiliary items required

• Testing Unit for Turbocharger (V.A.G 1687)

• Adapter (V.A.G 1687/5)

- Remove the noise insulation.

- Release the clip - A - and disconnect the hose - B - from the charge air pipe.





- Install the (V.A.G 1687/5) to the charge air hose - A - and rotate it approximately 90 degrees - B -.





Prepare the (V.A.G 1687) as follows:

- Turn the pressure regulating valve - 2 - counterclockwise until it stops.





- Close the valves - 3 and 4 -.

• In order to be able to turn the pressure regulator valve - 2 -, the knob must be pulled upward.

- Connect the (V.A.G 1687) as shown.





- Connect the pressurized air hose - 1 - (pressurized air supply) to the (V.A.G 1687).





• If water is located in the viewing glass, drain it via the water drain plug - 6 -.

- Open the valve - 3 -.

- Set the pressure to 0.5 bar using pressure regulator valve - 2 -.


Pressure must not exceed 0.5 bar! A pressure set too high may damage the engine.

- Open the valve - 4 - and wait until the testing circuit has filled. If necessary, continue to regulate pressure to 0.5 bar.

- Check the charge air system for leaks by listening, feeling, using commercially available leak detection spray or by using (V.A.G 1842).

• Assembly of hose connections with connection couplings. Refer to => [ Hose Connections with Connector Couplings, Assembling ] Hose Connections With Connection Couplings, Assembly.

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

• For handling instructions of the (V.A.G 1842), refer to the Owner's Manual.

• Before removing the (V.A.G 1687/5), discharge the pressure in the testing circuit by pulling off the coupling from the (V.A.G 1687/5).

• Hose connections and charge air system hoses must be free of oil and grease before installing.