Charge Air System, Checking For Leaks

Charge Air System, Checking for Leaks

Special tools, testers and auxiliary items required

• Adapter (VAG 1687/5)

• Testing unit for turbocharger (VAG 1687)

• Ultrasonic measuring device (VAG 1842) commercially available leak detection spray

Test Sequence

- Remove the noise insulation.

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





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





Prepare the (VAG 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 (VAG 1687) as shown.





- Connect a pressurized air hose - 1 - (pressurized air supply) to the (VAG 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 the pressure regulator valve - 2 -.

CAUTION!
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 leaking areas by listening, touching, using leak detection spray or using the (VAG 1842).

• Charge air hose disconnecting and connecting. Refer to --> [ Charge Air Hose Connector Coupling, Disconnecting and Connecting ] Charge Air Hose Connector Coupling, Disconnecting and Connecting.

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

• Handling instructions of the (VAG 1842), refer to --> Owner's Manual.

• Before removing the (VAG 1687/5), discharge the pressure in the testing circuit by disconnecting the coupling from the (VAG 1687/5).

• Charge air system hoses must be free of oil and grease before installing.