Turbocharger: Testing and Inspection

Charge Air System, Checking for Leaks

Special tools, testers and auxiliary items required

• Turbocharger testing unit (VAG 1687)

• Adapter (VAG 1687/10)

- Remove intake hose - 1 - from air filter.





- Place adapter (1687/10) in intake hose - 1 - and secure it with a clamp.

Prepare testing unit for turbocharger (VAG 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 testing unit for turbocharger (VAG 1687) on adapter (1687/10) as shown.





- Connect pressurized air hose - 1 - (pressurized air supply) to testing unit for turbocharger (VAG 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 -.

CAUTION!
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 ultrasonic measuring device (VAG 1842).

• Small leaks on the intake side of the turbocharger or permitted because the intake hoses are not designed for positive pressure.

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

• Handling instructions of ultrasonic measuring device (V.A.G 1842). Refer to --> Owner's Manual.

• If a poorly sealed area is discovered, observe the notes for charge air system when repairing. Refer to --> [ Hose Connections with Connector Couplings ] Hose Connections with Connector Couplings.

• Before removing adapter, discharge pressure in testing circuit by pulling off coupling from adapter (1687/10).