Charge Air System, Checking For Leaks: Procedure

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-- Follow the guidelines for clean working conditions. Refer to GUIDELINES FOR CLEAN WORKING CONDITIONS .

-- Remove the front noise insulation. Refer to NOISE INSULATION .

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

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-- Depending on the hose diameter, insert the :VAG1687/10 , :VAG1687/11 or :VAG1687/12 in the air guide hose -1- and secure with a hose clamp.

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-- Connect the : VAG1687 as shown.

Prepare the :VAG1687 as follows:

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

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

-- Connect the :VAG1687 to compressed air -1- with a commercially available intermediate piece.

-- Drain the water in the viewing glass via the water drain plug -6-.

-- Open the valve -3-.

CAUTION:

- Never set the test pressure specified.

-- Set the pressure to 0.2 bar (2.9 psi) using the pressure regulating valve -2-.

-- Open the valve -4- and wait until the test circuit is filled. Regulate the pressure to 0.2 bar (2.9 psi) again if necessary.

-- Check the charge air system for leaks by listening, feeling and using commercially available leak detection spray or the Ultrasonic Tester:VAG1842S . Refer to the Owner's Manual for information on using the :VAG1842S .

TIP:

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