Charge Air System, Checking For Leaks

WARNING: This page is about a different car, the 2023 Volkswagen Arteon. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Turbo System Tester Kit - Adapter:V.A.G 1687/18-1
Turbo System Tester Kit:V.A.G 1687
Ultrasonic Tester:V.A.G 1842S
Turbo System Tester Kit - Adapter 6:V.A.G 1687/6

-- Remove the engine cover. Refer to ENGINE COVER, REMOVING AND INSTALLING .

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

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-- Release the catches -arrows- and disconnect the air duct hose.

-- Secure the Turbo System Tester Kit - Adapter:V.A.G 1687/6 -B- with a clamp -arrow- to the Turbo System Tester Kit - Adapter:V.A.G 1687/18-1 -A-.

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-- Secure the adapter -A- with a clamp -arrow- to the turbocharger connection -1-.

-- Connect the Turbo System Tester Kit:V.A.G 1687 -C- to the plug -B-.

-- Pull up the pressure regulating valve -2- and screw out all the way until it stops.

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-- Close valves -3 and 4-.

-- Connect the commercially available pressure hose -1- to the tester -7-.

Requirement

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

-- Open the valve -3-.

CAUTION:

Risk of damaging the components if the pressure is set too high.

- Never set the test pressure higher than is specified.

- Open the cap on the oil filler tube that no pressure can be built in the crankcase.

-- Turn the pressure regulating valve -2- until a pressure of 0.2 bar (2.9 psi) is reached.

-- Open the valve -4- and wait until the test circuit is filled.

Requirement

If the pressure drops slightly, then readjust to 0.2 bar (2.9 psi).

-- Check the charge air circuit for leaking areas:

By listening
By feeling
With a commercially available leak detection spray
with Ultrasonic Tester:V.A.G 1842S . Refer to the appropriate Service Information.

Tip

A pressure retention test is not possible because small amounts of air can escape into the engine via the valves.

Requirement

If leaks were determined and sealed, then repeat the leak test.
If no leak is determined, remove all tools.

-- Remove the hose couplings.

Tightening Specifications

Refer to Charge Air Hose Connections .