SEAT Workshop Service and Repair Manuals

Checking charge air system for leaks Consult the equivalence table for tools and equipment according to applicability among Seat / VW / Audi / Skoda → Chapter. Special tools and workshop equipment required

t  Cooling system leakage check -VAG 1687-, see equivalent → Anchor

Operation process –  Loosen the engine cover at the locations -arrows- and remove.

–  Remove intake hose -1- from air filter. –  Insert adapter -1687/10- in intake hose -1- and secure with clip. Prepare charge air system tester -V.A.G 1687- as follows:

–  Unscrew pressure regulating valve -2- and close valves -3- and -4-.   Note To turn the pressure regulating valve -2- the knob must be pulled upwards.

–  Connect charge air system tester -V.A.G 1687- to adapter -1687/10- as shown.

–  Connect compressed air hose -1- (compressed air source) to charge air system tester -V.A.G 1687-.   Note If there is water in the sight glass, drain at water drain screw -6-. –  Open valve -3-. –  Adjust pressure to 0.5 bar with pressure regulating 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, readjust the pressure to 0.5 bar. –  Check the charge air system for leaks as follows: t  By listening t  By feeling t  With leak detecting spray t  Or with the ultrasonic leakage tester -VAG 1842S-   Note t  Slight leaks on the intake side of turbocharger are permissible, as the intake hoses are not designed for high-pressure. 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 leakage tester -VAG 1842S- → Operating instructions. t  If a leak is found, consult the notes on the supercharge system for the fitting work to be done. t  Release pressure from the test circulation by detaching coupling from adapter -VAG 1687/10- before removing adapter. –  Mount the intake hose on the vibration damper. –  Mount air intake hoses with screw clamps.