Charge Air System, Checking For Leaks: Procedure

-- Loosen the clamps -1 and 2- and remove the air guide pipe.

Fig 1: Identifying Clamps With Air Guide Pipe

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-- Connect the :VAG1687/10 with the :VAG1687/14 to the turbocharger.

Fig 2: Identifying Turbocharger Testing Unit

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-- Connect the :VAG1687 to the adapter.

Prepare the :VAG1687 as follows:

Fig 3: Connecting Pressurized Air Hose To Testing Unit For Turbo Charger V.A.G 1687

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-- 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 :VAG1687 to compressed air -1- with a commercially available adapter piece.

NOTE:

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

-- Open the valve -3-.

CAUTION:

Risk of damage if the pressure is set too high.

-- 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 :VAG1842 to check the charge air system for leaks.

NOTE:

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

Information on the :VAG1842S . Refer to the Operating Instructions.

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