Checking Charge Air System For Leaks

WARNING: This page is about a different car, the 2009 Audi TT and 2008 Audi TT. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Testing Unit for Turbocharger V.A.G 1687
Adapter V.A.G 1687/5

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

-- Release clasp -A- and disconnect hose -B- from charge air pipe.

Fig 1: Identifying Locking Clip & Charge Air Hose

GWWN21-10041

Courtesy of AUDI OF AMERICA, LLC

-- Connect the V.A.G 1687/5 to charge air hose -A- and rotate it around approximately 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:

-- Unscrew pressure regulator valve -2- completely 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 shown.

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

GWWN21-10040

Courtesy of AUDI OF AMERICA, LLC

-- Connect 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 valve -3-.

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

CAUTION:

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

-- Open valve -4- and wait until testing circuit has filled. If necessary, continue to regulate pressure to 0.5 bar.

-- Check charge air system for leaking areas by listening, touch, using leak detection spray or using ultrasonic measuring device V.A.G 1842.

NOTE:

A small quantity of air dissipates via valves in engine. A pressure retention test is not possible for this reason.
Handling instructions of the V.A.G 1842 use the Owner's Manual.
Before removing adapter, discharge pressure in testing circuit by pulling off coupling from adapter V.A.G 1687/5.
Hose connections and charge air system hoses must be free of oil and grease before installing.

-- Install air guide pipes and connector. Refer to HOSE CONNECTIONS WITH CONNECTOR COUPLINGS, ASSEMBLING .