Charge Air System, Checking For Leaks: Procedure

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

-- Remove the resonator for the intake air scoop. Refer to INTAKE AIR SCOOP RESONATOR, REMOVING AND INSTALLING .

-- Remove the bolts -arrows- and then remove the crankcase ventilation hose -1-.

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NOTE:

Risk of chemical damage to the coolant pump seal from oil entry between the coolant pump and the cylinder head.

-- Cover the coolant pump with a clean cloth to catch escaping oil.

-- Seal off the opening on the turbocharger using a suitable plug from the :VAS6122 .

-- Connect the :VAG1687/15 with the :VAG1687/11 to the turbocharger.

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-- Connect the hose -1- from the :VAG1687 to the adapter.

Prepare the :VAG1687 as follows:

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

The knob must be pulled upward so that the pressure regulating valve -2- can be turned.

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

NOTE:

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

-- Open the valve -3-.

There is a risk of damage if the pressure is set too high.

-- Set the pressure to 0.5 bar (7.2 psi) using the pressure regulating 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.

Refer to the service/repair/system information for using the :VAG1842S .

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