Charge Air System, Checking For Leaks: Procedure

WARNING: This page is about a different car, the 2018 Volkswagen Jetta, 2017 Volkswagen Jetta, and 2016 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

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

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

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

Prepare the :VAG1687 as follows:

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- 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 Damaging the Engine.

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

The pressure must not exceed 0.5 bar (7.2 psi)!

-- 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 appropriate service/repair/system information for using the :VAG1842S .

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

Assemble in the reverse order of removal. Note the following:

Replace the seal and O-rings.