Turbocharger Vacuum Diaphragm, Checking

Turbocharger Vacuum Diaphragm, Checking

NOTE:
- Secure all hose connections using hose clamps appropriate for the model type.
- Hose connections and charge air system hoses must be free of oil and grease before installing. Sealing ring and sealing surfaces must only be lightly oiled with connector couplings.
- Charge air system must be properly sealed.
- Replace self-locking nuts.
- Spring clamp pliers VAS 6362 or hose clamp pliers V.A.G 1921 are recommended for installing spring clamps.
- Add oil to turbocharger through oil feed line connecting piece.
- After installing turbocharger, let engine idle for approximately 1 minute without increasing engine speed. This ensures adequate oil supply to the turbocharger.
- Observe the rules for cleanliness.

Special tools, testers and auxiliary items required
- Hand Vacuum Pump VAS 6213

Test Conditions
- Hose from exhaust turbocharger over wastegate bypass regulator valve must have continuity to vacuum diaphragm.
- Wastegate bypass regulator valve OK.

Work Procedure
- Remove engine cover.







- Connect hand vacuum pump VAS 6213 to vacuum diaphragm - arrow -.







- Set slide ring - 1 - on hand vacuum pump VAS 6213 to position - B - for "pressure".

CAUTION: The pressure must not exceed 750 mbar. If the pressure is exceeded, the vacuum diaphragm can be damaged.

- Operate hand vacuum pump VAS 6213 several times and observe rods.







The linkage - A - must move approximately 300 mbar and be at approximately 700 mbar at end position.

Actuator lift is approximately 10 mm.

NOTE: If pressure cannot be raised with hand vacuum pump VAS 6213 or pressure drops immediately, check hand vacuum pump VAS 6213 and connecting hoses for leaks. If no malfunction can be found: Replace vacuum diaphragm.