Skoda Workshop Service and Repair Manuals > Roomster > Drive unit | 1.9/77 kW TDI PD Engine | Exhaust turbocharger, G-charger | Charge-air system with exhaust gas turbocharger

Checking the charge-air system for leaktightness (Superb II, Octavia II, Fabia II, Roomster)

Special tools and workshop equipment required

t	Charge-air system testing device, e. g. -V.A.G 1687-

t	Adapter, e.g. -V.A.G 1687/10-

Test sequence

–	Remove the intake hose -1- from the air filter.

–	Fit adapter -1687/10- into the intake hose -1- and secure with a clamp.

Prepare tester for charge air system -V.A.G 1687- as follows:

Note

The rotary knob must be pulled to the top in order to rotate the pressure control valve -2-.

–	Unscrew pressure control valve -2- fully and close the valves -3- and -4-.

–	Connect the pneumatic hose -1- (pneumatic support) to tester for charge air system.

Note

If there is water in the transparent water drain reservoir, drain water via the drain plug -6-.

–	Connect tester for charge air system - V.A.G 1687- to adapter -1687/10-.

–	Open valve -3-.

–	Set the pressure to 0.05 MPa (0.5 bar) with the pressure control valve -2-.

Caution

The pressure must not be greater than 0.05 MPa (0.5 bar)! A too high pressure can damage the engine.

–	Open valve -4- and wait until the test circuit is filled. If necessary regulate the pressure to 0.05 MPa (0.5 bar).

–	Listen to, touch or use commercially available leak search spray or the ultrasonic measuring device, e.g. -V.A.G 1842-, to check the charge-air system for leak points.

Note

t	Minor leaks are permissible on the suction side of the turbocharger, because the intake hoses are not designed for overpressure.

t	A small amount of air penetrates via the valves into the engine. For this reason no pressure test is possible.

t	Use of ultrasonic measuring device -V.A.G 1842- → Operating Instructions.

t	In case of a leak point, observe the instructions for charge air system → Chapter during the installation.

t	Before removing the adapter, depressurize the test circuit by detaching the coupling from the adapter -1687/10 -.

Skoda Workshop Service and Repair Manuals