SEAT Workshop Service and Repair Manuals

Checking the supercharger system for leaks Special tools and workshop equipment required

t  Supercharger system tester -V.A.G 1687- t  Adapters -V.A.G 1687/5- –  Remove the central soundproofing pan → Bodywork, exterior fitting work; Rep. Gr.50.

–  Release the safety fastener -A- and detach the hose -B- from the supercharger air pipe.

–  Attach the adaptor -V.A.G 1687/5- to the supercharger air hose -A- and turn it approx. 90º -B-. Prepare the supercharger system tester -V.A.G 1687-, as described below:

–  Completely unscrew the pressure regulation valve -2- and close the valves -3- and -4-.   Note In order to unscrew the pressure regulation valve -2-, the rotary button must be completely upwards.

–  Connect the supercharger system tester -V.A.G 1687- as shown.

–  Attach the compressed air hose -1- (compressed air supply) to the supercharger system tester -V.A.G 1687-.   Note If there is water in the inspection hole, drain it through the drain screw -6-. –  Open valve -3-. –  Set the pressure to 0.5 bar using the pressure regulation valve -2-.   Caution The pressure must not exceed 0.5 bar! Excessive pressure may cause damage to the engine. –  Open the valve -4- and wait for the test circuit to be filled. If necessary reset the pressure to 0.5 bar. –  Examine whether the load air system is leaking. Use hearing and sense of touch, as well as a leak detection spray -V.A.G 1842- and/or ultrasonic measuring instrument.   Note t  Assembly of hose connections with couplings → Chapter. t  A small amount of air escapes through the valves into the engine. A pressure retention test can therefore not be carried out. t  Use of the ultrasound measuring device -V.A.G 1842- → Instruction manual. t  Before removing the adaptor, depressurize the inspection circuit by releasing the coupling of the adaptor -V.A.G 1687/5-. t  The couplings and air hoses of the supercharging system must be free from oil and grease before assembling.