Charge Air System, Checking For Proper Seal

Checking Charge Air System For Proper Seal

Special tools, testers and auxiliary items required
- Testing Unit for Turbo Charger V.A.G 1687
- Accessory Adapter V.A.G 1687/1

- Remove intake hose from air filter and from the crankcase ventilation tube.







- Insert the Accessory Adapter 1687/1 into the intake hose and seal the connection for crankcase ventilation using Adapter V.A.G 1687/4. Tighten the Hose Clamps up to 40 mms.

Prepare the Testing Unit for Turbo Charger V.A.G 1687 as follows:







- Unthread the pressure regulator valve -2- completely and plug the valves -3- and -4-.

NOTE: To be able to rotate the pressure regulator valve -2-, the rotary knob must be pulled upward.







- Connect the Testing Unit for Turbo Charger V.A.G 1687 as shown.







- Connect the compressed air line -1- (pressurized air supply) to Testing Unit for Turbo Charger V.A.G 1687.

NOTE: If water is present in the separator, drain the water using the drain plug -6-.

- Open valve -3-.
- Set the pressure regulator valve -2- to a pressure of 0.5 bar.

CAUTION: The pressure must not exceed 0.5 bar. If the pressure is set too high, the engine could be damaged.

- Open the valve -4- and wait until the test circuit is filled. If necessary, regulate the pressure to 0.5 bar again.
- Check the charge air system for poorly sealed areas by listening, feeling, using commercially available leak detection spray or by using the Ultrasonic Measuring Device V.A.G 1842.

NOTE:
- A minimal amount of air will escape through the turbocharger into the oil pan. For this reason a pressure retention test is not possible.
- Using the Ultrasonic Measuring Device V.A.G 1842 Operating instructions
- If a poorly sealed area is discovered, observe the notes for charge air system when repairing.
- Before removing the Adapter, release pressure from the test circuit by separating the connection from the Accessory Adapter 1667/1.