SEAT Workshop Service and Repair Manuals

Checking charge air system for leaks Special tools and workshop equipment required

t  Charge pressure system tester -V.A.G 1687-, see equivalent → Anchor t  Adapter -V.A.G 1687/5-

–  Release retaining clip -A- and disconnect hose -B- from charge air pipe.

–  Fit adapter -V.A.G 1687/5- onto charge air hose -A- and turn by approx. 90° -B-. Prepare charge air system tester -V.A.G 1687- as follows:

–  Unscrew pressure control valve -3- completely and close valves -3- and -4-.   Note Make sure knob is pulled out before turning pressure control valve -2-.

–  Connect charge air system tester -V.A.G 1687- as shown in illustration.

–  Connect pressure hose -1- (compressed air supply line) to charge air system tester -V.A.G 1687-.   Note If there is water in sight glass, remove drain plug -6- and drain water. –  Open valve -3-. –  Adjust pressure to 0.5 bar via pressure control valve -2-.   Caution The pressure must not exceed 0.5 bar. If the pressure is set too high this can damage the engine. –  Open valve -4- and wait until test system is pressurised. If necessary, adjust pressure to 0.5 bar again. –  Check charge air system for audible leaks or leaks that can be felt with the hand; apply commercially available leak detecting spray or use ultrasonic tester -V.A.G 1842-.   Note t  Assembly of hose connections with couplings → Chapter t  A small amount of air escapes through the valves and enters the engine. Therefore it is not possible to perform a pressure retention test. t  Operation of ultrasonic tester -V.A.G 1842- → Operating instructions. t  Depressurise test circuit by detaching coupling from adapter -V.A.G 1687/5- before removing adapter. t  Hose connections and hoses for charge air system must be free from oil and grease before fitting.