Audi A4

since 1994 release

Manual of the car

Audi A4
+ Running gear
+ Regular servicing
+ Engines
- Turbo-supercharging
   Draft switching off valve
   Check of adjustment of pressure of pressurization
   The help at malfunctions
   The turbocompressor is faulty?
   Radiator of nadduvochny air
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ System of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics


The turbocompressor is faulty?

Laying of hoses and arrangement a turbocompressor – an exhaust

1 – coal filter;
2 – ventilating tube of the fuel tank;
3 – returnable valve of the coal filter;
4 – turbocompressor;
5 – fuel pressure regulator;
6 – inlet collector;
7 – ventilation of a case;
8 – returnable valve of the coal filter;

9 – branch pipe of a butterfly valve;
10 – radiator of nadduvochny air;
11 – vacuum box of the regulator of pressure of pressurization;
12 – draft shutdown valve;
13 – electromagnetic valve of restriction of pressure of pressurization;
14 – valve of restriction of pressure of ventilation of a case;
15 – electromagnetic valve of the coal filter.

Before presumably faulty turbocompressor is replaced, it is necessary to check the following functions or possible sources of defects along with the defects given in the table of the help at malfunctions: knots of adjustment of pressure of pressurization, supply of fuel, injection, ignition, compression and air filter.

 Council: After long full loading let's the engine work before switching off some time idling.

Dismantle of a turbocompressor

During the works on a turbocompressor it is necessary to observe purity. Before a detachment carefully clean connecting places and their environment, put the dismantled details only on a pure lining, cover open knots for protection against pollution, establish only pure new details, do not work with compressed air near the place of repair and do not move the car.


  1. Disconnect a wire of mass of the accumulator.
  2. Dismantle the air filter.
  3. Disconnect air hoses from a turbocompressor.
  4. Densely press water hoses to a turbocompressor and dismantle.
  5. Unscrew an exhaust suspension bracket from the transmission.
  6. Unscrew the catalytic converter (four nuts) from a turbocompressor.
  7. Unscrew an oil supply hose from a turbocompressor.
  8. Unscrew an oil return hose from a turbocompressor.
  9. From below unscrew fixing bolts which the turbocompressor to a final collector fastens. The bent laid on key of SW 12 is for this purpose used.
  10. Strongly hold a turbocompressor during unscrewing and lift it up.
  11. Installation: use new nuts and bolts. Grease bolts of a flange of a turbocompressor/knee of a final collector with G 000 500 lubricant in the field of a carving and basic surfaces of heads.
  12. Establish a turbocompressor with all bolts and nuts in the beginning so that it could move a little. For this purpose only slightly fasten fixing nuts / bolts.
  13. Screw up four fixing bolts for fastening of a turbocompressor at a final collector and tighten taking into account the necessary moment of an inhaling.
  14. Only after it tighten nuts on a reception pipe.
  15. Before connection of a hose of supply of oil it is necessary in a connecting branch pipe on the compressor in the beginning to pour a little fresh engine oil.
  16. After installation of a turbocompressor do not start the engine at once on high turns as compressor lubricant is still unreliable.
  17. Let's it work within one minute idling.

Inhaling moments

Fastening of the compressor (a nut with M10 fillet)
The catalytic converter at a turbocompressor
Hose of supply of oil to a turbocompressor
Hose of return of oil from a turbocompressor
Hollow bolt of supply of cooling liquid to a turbocompressor
Returnable hose of cooling liquid from a turbocompressor