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 securing clip - A - and disconnect the hose - B - from charge air pipe.
- Install the adapter (V.A.G 1687/5) to the charge air hose - A - and rotate it approximately 90° - B -.
Prepare the testing unit for turbocharger (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 rotary knob must be pulled upward.
- Connect the testing unit for turbocharger (V.A.G 1687) as shown.
- Connect the pressurized air hose - 1 - (pressurized air supply) to the testing unit for turbocharger (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 the 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 the pressure to 0.5 bar.
- Check the charge air system for leaks by listening, feeling, using commercially available leak detection spray or by using the ultrasonic measuring device (V.A.G 1842).
• Charge air hose, installing. Refer to => [ Charge Air Hose, Installing ] Charge Air Hose, Installing.
• A small quantity of air dissipates via the valves in the engine. A pressure retention test is not possible for this reason.
• Handling instructions of ultrasonic measuring device (V.A.G 1842). Refer to the user's manual.
• Before removing the adapter, discharge pressure in the testing circuit by pulling off the coupling from the adapter (V.A.G 1687/5).
• Hose connections and charge air system hoses must be free of oil and grease before installing.