Charge Air System, Checking For Leaks

Special tools and workshop equipment required

Turbo System Tester Kit VAG 1687

Procedure

-- Remove the front noise insulation, refer to FRONT NOISE INSULATION, REMOVING AND INSTALLING .

-- Loosen the hose clamp -arrow-, remove the air duct hose and move it to the side.

Fig 1: Identifying Hose Clamp

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-- Install the Turbo System Tester Kit - Adapter 12 VAG 1687/12 into the air guide hose -1- and secure it with a clamp.

Fig 2: Identifying VAG 1687

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-- Connect the Turbo System Tester Kit VAG 1687 as illustrated.

Prepare the Turbo System Tester Kit VAG 1687 as follows:

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

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

NOTE:

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

-- Connect the Turbo System Tester Kit VAG 1687 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!

-- 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 Measuring Device VAG 1842 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 VAG 1842S, refer to the Owner's Manual.

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:

NOTE:

Replace the seal and O-rings.

-- Install the air guide hoses and screw-type clamps, refer to OVERVIEW - CHARGE AIR HOSE CONNECTIONS, AIR GUIDE WITH SCREW-TYPE CLAMPS .

Tightening Specifications

Refer to FRONT NOISE INSULATION, REMOVING AND INSTALLING .