Charge Air System, Checking For Leaks
Special tools and workshop equipment required
- Testing Unit for Turbocharger V.A.G 1687
- Adapter V.A.G 1687/12
Procedure
-- Remove the engine cover -1- upward -arrows-.
-- Remove the bolts -arrows-.
-- Open the clamps -1 and 2- and remove the air guide pipe.
-- Install the 1687/12 into the air guide hose -1- and secure it with a clamp.
-- Connect the V.A.G 1687 to the adapter.
Prepare the V.A.G 1687 as follows:
-- Remove the pressure regulator valve -2- and close valves -3 and 4-.
- The rotary knob must face upward so the pressure control valve -2- can be turned.
-- Connect the V.A.G 1687 to compressed air -1- with a commercially available adapter piece.
If there is water in the 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 0.2 bar!
-- Set the pressure to 0.2 bar using the pressure control valve -2-.
-- Open the valve -4- and wait until the test circuit is filled. Regulate the pressure to 0.2 bar again if necessary.
-- Listen, feel and use commercially available leak detection spray or the ultrasonic tester V.A.G 1842 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 V.A.G 1842, refer to the operating instructions.
Release the pressure in the test circuit by pulling off the hose coupling before removing the adapter.
Assembling
Assemble in reverse order of disassembling. Note the following:
The hose connections as well as the air guide pipes and hoses must be free of oil and grease before installing.
Secure all hose connections with hose clamps of the same type as those equipped by the factory.
In order to be able to securely mount the air guide hoses on their connectors, spray the screws on the previously used clamps with a rust remover.
-- Install the air guide pipe. Refer to CHARGE AIR COOLER OVERVIEW .