Charge Air System, Checking For Leaks

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Special tools and workshop equipment required

Turbocharger Testing Unit V.A.G 1687
Adapter V.A.G 1687/5
Ultrasonic Measuring Device V.A.G 1842

-- Remove noise insulation. Refer to Removal and Installation .

Cabriolet

-- Remove the noise insulation bracket. Refer to Removal and Installation .

All

-- Release the securing clip -A- and disconnect the hose -B- from the charge air pipe.

Fig 1: Identifying Locking Clip & Charge Air Hose

GWWN21-10041

Courtesy of AUDI OF AMERICA, LLC

-- Mount the V.A.G 1687/5 onto the charge air pipe -A- and turn it approx. 90° -B-.

Fig 2: Connecting Adapter V.A.G 1687/5 To Charge Air Hose And Rotate It Around Approx. 90 Degrees

GWWN21-10039

Courtesy of AUDI OF AMERICA, LLC

Prepare the V.A.G 1687 as follows:

-- Remove the pressure regulator valve -2- and close valves -3- and -4-.

Fig 3: Connecting Pressurized Air Hose To Testing Unit For Turbo Charger V.A.G 1687

GWWV21-0168

Courtesy of AUDI OF AMERICA, LLC

NOTE:

In order to be able to turn pressure regulator valve -2-, rotary knob must be pulled upward.

-- Connect the V.A.G 1687 as illustrated.

Fig 4: Connecting Testing Unit For Turbo Charger V.A.G 1687

GWWN21-10040

Courtesy of AUDI OF AMERICA, LLC

-- Connect the pressurized air hose -1- (pressurized air supply) to the V.A.G 1687.

Fig 5: Connecting Pressurized Air Hose To Testing Unit For Turbo Charger V.A.G 1687

GWWV21-0168

Courtesy of AUDI OF AMERICA, LLC

NOTE:

If water is located in viewing glass, drain it via water drain plug -6-.

-- Open the valve -3-.

-- Set the pressure to 0.5 bar using the pressure regulator valve -2-.

CAUTION:

Pressure must not exceed 0.5 bar! A pressure set too high may damage the engine.

-- Open the valve -4- and wait until the test circuit is filled. Adjust the pressure to 0.5 bar if necessary.

-- Inspect the charge air system for poorly sealed areas by listening, feeling, using commercially available leak detection spray or by using the ultrasonic measuring device V.A.G 1842.

NOTE:

Assembly of hose connections with connection couplings. Refer to HOSE CONNECTIONS WITH CONNECTOR COUPLINGS, ASSEMBLING .

A small quantity of air dissipates via valves in engine. A pressure retention test is not possible for this reason.

Handling instructions of V.A.G 1842 see Owner's Manual.

Before removing adapter, discharge pressure in testing circuit by pulling off coupling from V.A.G 1687/5.

Hose connections and charge air system hoses must be free of oil and grease before installing.