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Fuel preparation system Diesel injection > < Hose connections with push-fit couplings

Octavia Mk2

Checking the charge-air system for leaktightness
Checking the charge-air system for leaktightness
Special tools and workshop equipment required
t  Charge-air system testing device, e. g. -V.A.G 1687-
t  Adapter, e.g. -V.A.G 1687/10-
Test sequence
   
–  Remove the suction hose -1- from the air filter.
–  Fit adapter -1687/10- into the suction hose -1- and secure with a clamp.
Prepare tester for charge air system -V.A.G 1687- as follows:
  N21-10146
–  Unscrew pressure control valve -2- fully and close the valves -3- and -4-.
  Note
The rotary knob must be pulled to the top in order to rotate the pressure control valve -2-.
  V21-0168
–  Connect the tester for charge air system -V.A.G 1687-, as shown, at the adapter -1687/10-.
  N21-10146
–  Connect the pneumatic hose -1- (pneumatic support) at tester.
  Note
If there is water in the transparent water drain reservoir, drain water via the drain plug -6-.
–  Open valve -3-.
–  Set the pressure to 0.05 MPa (0.5 bar) with the pressure control valve -2-.
  Caution
The pressure must not be greater than 0.05 MPa (0.5 bar)! A too high pressure can damage the engine.
–  Open valve -4- and wait until the test circuit is filled. If necessary regulate the pressure to 0.05 MPa (0.5 bar).
–  Listen to, touch or use commercially available leak search spray or the ultrasonic measuring device, e.g. -V.A.G 1842-, to check the charge-air system for leak points.
  Note
t  Minor leaks are permissible on the suction side of the turbocharger, because the suction hose is not designed for overpressure.
t  A small amount of air escapes via the valves into the engine. For this reason no pressure test is possible.
t  Use of ultrasonic measuring device -V.A.G 1842- → operating instructions.
t  In case of a leak point, observe the instructions for charge air system → Chapter during the installation.
t  Before removing the adapter, depressurize the test circuit by detaching the coupling from the adapter -1687/10-.
  V21-0168

Fuel preparation system Diesel injection > < Hose connections with push-fit couplings