Charge Air System, Checking For Leaks

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Special tools and workshop equipment required

Turbo System Tester Kit :VAG1687
Ultrasonic Measuring Device :VAG1842

Procedure

Depending on the model, preliminary work may be required. Refer to CHARGE AIR SYSTEM, CHECKING FOR LEAKS .

Prepare the :VAG1687 as follows:

Courtesy of AUDI OF AMERICA, LLC

-- Completely remove the pressure regulating valve -2- and close the valves -3 and 4-.

The knob must face upward so the pressure regulating valve can be turned.

-- Connect the :VAG1687 to the 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-.

CAUTION:

Risk of damaging the components if the pressure is set too high.

- Never set the test pressure above the specified adjustment.

-- Set the pressure to 0.2 bar (2.9 psi) 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 (2.9 psi) again if necessary.

-- Listen, feel and use commercially available leak detection spray or the :VAG1842 to check the charge air system for leaks. Refer to the Owner's Manual.

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 removing the hose coupling before removing the adapter.

Assembling

Assemble in the reverse order of removal. Note the following:

Replace the seal and O-ring after removal.
Secure all hose connections with hose clamps that match the ones used in series production. Refer to the Parts Information.

Additional procedures depending on the model: CHARGE AIR SYSTEM, CHECKING FOR LEAKS .