Charge Air System, Checking For Leaks: Procedure
Depending on the model, preliminary work may be required. Refer to OVERVIEW - CHARGE AIR SYSTEM .
Prepare the: VAG1687 as follows:
-- Completely remove the pressure regulating valve -2- and close the valves -3- and -4-.
- Pull the knob in order to rotate the pressure regulating valve -2-.
-- Connect the :VAG1687 to compressed air -1- with a commercially available intermediate piece.
-- Drain the water in the viewing glass via the water drain plug -6-.
-- Open the valve -3-.
-- Set the pressure to 0.2 bar (2.9 psi) using the pressure regulating valve -2-.
- Pressure must not exceed 0.2 bar (2.9 psi)!
-- Open the valve -4- and wait until the test circuit is filled. Regulate the pressure to 0.2 bar (2.9 psi) again if necessary.
-- Listen, feel and use commercially available leak detection spray or the :VAG1842S to check the charge air system for leaks. Refer to the Owner's Manual for handling.
TIP:
A small quantity of air dissipates via the valves in the engine. For this reason a pressure retention test is not possible.
- Release the pressure in the test circuit by pulling off the coupling before removing the adapter.
- Secure all hose connections with hose clamps that match the ones used in series production. Refer to the Parts Information.