Charge Air System, Checking For Leaks

WARNING: This page is about a different variant/trim than selected.

Special tools and workshop equipment required

Procedure

-- Remove the front noise insulation -1-. Refer to Removal and Installation .

Fig 1: Front Noise Insulation -1 And 2-

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-- Raise the retaining clip -A- and remove the air guide hose -B-.

Fig 2: Identifying Locking Clip & Charge Air Hose

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-- Place the V.A.G 1687/5 on the air guide hose -A- and rotate approximately 90° -B-.

Fig 3: Connecting Adapter V.A.G 1687/5 To Charge Air Hose And Rotate It Around Approx. 90 Degrees

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Prepare the V.A.G 1687 as follows:

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

Fig 4: Connecting Pressurized Air Hose To Testing Unit For Turbo Charger V.A.G 1687

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NOTE:

The rotary knob must face upward so the pressure control valve -2- can be turned.

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

Fig 5: Connecting Testing Unit For Turbo Charger V.A.G 1687

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-- Connect the V.A.G 1687 to compressed air -1- with a commercially available adapter piece.

Fig 6: Connecting Pressurized Air Hose To Testing Unit For Turbo Charger V.A.G 1687

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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.

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

-- Open the valve -4- and wait until the test circuit is filled. Regulate the presure to 0.5 bar again if necessary.

-- Listen, feel and use commercially available leak detection spray or the ultrasonic tester V.A.G 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 V.A.G 1842, refer to the Operating Instructions.

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

The hose supports, air guide pipes and hoses must be free of oil and grease before installing.

-- Follow the instructions for installing the air guide pipes and hoses with connector couplings. Refer to AIR GUIDE PIPES AND HOSES WITH CONNECTOR COUPLING .

-- Install the noise insulation. Refer to Removal and Installation .