Charge Air System, Checking For Leaks: Procedure
-- Remove the noise insulation. Refer to Noise Insulation, Removing And Installing .
-- Raise the retaining clip -A- and remove the air guide hose -B-.
-- Attach the : VAG1687/5 to the air guide hose -A- and turn 90° -arrow B- to lock in place.
-- Connect the hose for the : VAG1687 to the : VAG1687/5 as shown in illustration.
Prepare the : VAG1687 as follows:
-- Fully turn out the pressure regulator valve -2- to the closed position and close the valves -3 and 4-.
- The rotary knob must face upward so the pressure control valve -2- can be turned.
-- Connect the : VAG1687 to compressed air -1- with a commercially available adapter piece.
If there is water in he viewing glass, drain it through the drain plug -6-.
-- Open the valve -3-.
Damage could result if the pressure is set too high.
- Pressure must not exceed 0.5 bar (7.25 psi)!
-- Set the pressure to 0.5 bar (7.25 psi) using the pressure control valve -2-.
-- Open the valve -4- and wait until the test circuit is filled. Regulate the pressure to 0.5 bar (7.25 psi) again if necessary.
-- Listen, feel and use commercially available leak detection spray or the : VAG1842 to check the charge air system for leaks.
A small quantity of air dissipates via valves in engine. A pressure retention test is not possible for this reason.
For information on using the : VAG1842S . Refer to the Owner's Manual.
Release the pressure in the test circuit by pulling off the hose coupling before removing the adapter.