Test 3: Inspect Charge Air System For Leaks

Inspect charge air system for leaks

Special tool
- Test pressure gauge
- Charge air 611 589 02 21 00
- Connection adapter 271 589 00 91 00

Figure legend





- 119 Test pressure gauge
- 119/3 Compressed-air line
- 119/4 Plug 'Oil dipstick'
- 119/6 Connection adapter

Test sequence
- Remove air cleaner element.
- Seal guide tube for oil dipstick with stop plug.

Safety note!!
- Only remove or install the plug when the charge air system is pressureless!
- Connect test pressure gauge. (See fig.)
- Open shutoff cock of tester in direction of flow.
- Turn pressure reducing valve knob SLOWLY to the right until 300 mbar is reached.

IMPORTANT NOTE
- The pressure in the system will build up quite SLOWLY.
- Leaks can now be located acoustically or made visible by spraying on leak detector spray.

Question: Was the test o.k.?

No
The test is not o.k.

Fig. legend/ fig.





- b - Air line Secondary air system
- B2/5 (Hot film MAF sensor)
- M16/6 (throttle valve actuator)
- M16/7 (Recirculating air flap actuator)
- 122 Suction damper
- 50 Kompressor
- Pressure damper
- 110/1 Suction pipe
- 110/2 Charge air cooler
- 110/6 Suction/charge line

Possible cause and remedy
- Inspect all the vacuum lines connected to the inlet tract, for leaks and damage, and replace if necessary.

**End of test**

Yes
- The test is o.k.

**End of test**