Charge Air System, Checking For Leaks

Charge Air System, Checking for Leaks

Special tools, testers and auxiliary items required

• Testing Unit for Turbo Charger (V.A.G 1687)

• Adapter (V.A.G 1687/5)

- Remove noise insulation.

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






- Connect (V.A.G 1687/5) to charge air hose - A - and rotate it around approximately 90° - B -.






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

- Remove pressure regulator valve - 2 - completely and close valves - 3 - and - 4 -.






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

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






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






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

- Open valve - 3 -.

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

- Check charge air system for leaking areas by listening, touch, using leak detection spray or using the ultrasonic measuring device (V.A.G 1842).

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

• Handling instructions of the (V.A.G 1842) the owner's manual.

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

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

- Install air guide pipes and connector. Refer to => [ Hose Connections with Connector Couplings ] Service and Repair.