Charge Air System, Checking For Leaks

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Special tools and workshop equipment required

Turbo System Tester Kit VAG1687

Procedure

Fig 1: Identifying Hose Clamp

Courtesy of AUDI OF AMERICA, LLC

-- Remove the noise insulation, refer to OVERVIEW - NOISE INSULATION .

-- Loosen the hose clamp -arrow-, pull of the air guide hose and move it to the side.

-- Depending on the hose diameter, install the Turbo System Tester Kit - Adapter 10 VAG1687/10, Turbo System Tester Kit - Adapter 11 VAG1687/11 or Turbo System Tester Kit - Adapter 12 VAG1687/12 into the air guide hose -1- and secure it with a hose clamp.

Fig 2: Turbo System Tester Kit VAG1687

Courtesy of AUDI OF AMERICA, LLC

-- Connect the Turbo System Tester Kit VAG1687 as illustrated.

Prepare the Turbo System Tester Kit VAG1687 as follows:

Fig 3: Connecting Pressurized Air Hose To Testing Unit For Turbo Charger VAG 1687

Courtesy of AUDI OF AMERICA, LLC

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

NOTE:

Pull the knob in order to rotate the pressure regulating valve -2-.

-- Connect the Turbo System Tester Kit VAG1687 to compressed air -1- with a commercially available adapter piece.

Fig 4: Connecting Pressurized Air Hose To Testing Unit For Turbo Charger VAG 1687

Courtesy of AUDI OF AMERICA, LLC

NOTE:

If there is water in the viewing glass, drain it through the drain plug -6-.

-- Open the valve -3-.

CAUTION:

Damage could result if the pressure is set too high.

Pressure must not exceed 0.5 bar (7.2 psi)!

-- Set the pressure to 0.5 bar (7.2 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 (7.2 psi) again if necessary.

-- Listen, feel and use commercially available leak detection spray or the Ultrasonic Tester VAG1842 to check the charge air system for leaks.

NOTE:

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 Ultrasonic Tester VAG1842, refer to the Operating Instructions.

Release the pressure in the test circuit by pulling off the coupling before removing the adapter.

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 .

To mount the air guide hoses on their connectors securely, spray the bolts on the used clamps with rust remover before installing.