Audi 80/Avant (B4)

since 1991-1995 of release

Repair and car operation



Audi 80/Avant
+ Technical specification
+ Engines
- System of production of the fulfilled gases
   Check of a suspension bracket and condition of system of production of the fulfilled gases
   Replacement of system of production of the fulfilled gases
   Removal of separate elements
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ injection System
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrosystem
+ ignition System
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications





Removal of separate elements

At the left: the illustration shows connection between the catalyst and a forward exhaust pipe (2). Further it is possible to see a lambda probe (1) and (3) suspension bracket of a forward exhaust pipe supplied with a spring.

On the right: here the place of the socket (shooter) is once again shown. At installation it is necessary to pay attention to that cheeks of a flange were in parallel each other, as is shown in this illustration.

At the left: the double bracket for fastening of a pipe (shooter) should be replaced even after removal of the one and only screw connection.

On the right: at installation of a tightening bracket (shooter) it is necessary to watch its situation (horizontally or vertically).

It is described below how to disconnect from each other separate elements of system of production of the fulfilled gases. For repeated installation the last section on assembly of system of production of the fulfilled gases is important.

 Help: in order that at the subsequent work on an exhaust system bolts were easier disconnected, it is necessary to grease a carving with graphitic greasing. Tightening plugs too separate from a pipe easier if their inside is processed by graphitic greasing.

Separation of an exhaust pipe from a final collector

 PERFORMANCE ORDER

  1. Raspornye bolts on which fixing nuts of an exhaust pipe sit, easily break if to try to turn off strongly rusted nut without preliminary processing.
  2. Therefore before work it is necessary to process nuts of connection by spray for removal of a rust or (often even it is better): To cut down nuts a sharp chisel. As a rule, they consist of very soft material with the enclosed carving part. The carving part will need to be "knocked over" separately then from a carving of a rasporny bolt.
  3. New nuts from «a set for fastening of system of production of exhaust gases» consist also from this a "soft" material. So it is not necessary to apply any other nuts from a house collection. Inhaling moment: 35 N • m.

Removal lambda probe

Lambda (oxygen) - the probe is necessary for removing at replacement of catalytic converter (or the probe).

 PERFORMANCE ORDER

  1. To hang out fastenings of wires at a body, to separate shtekerny connections (to see a wire on all length).
  2. To unscrew a probe.
  3. At installation a lambda probe it is necessary to grease it with lubricant means of G 5 of a set of workshops of Audi. Thus greasing should not get to a cut of the case of a probe. Inhaling moment: 50 N • m.

Weakening of a triangular flange

Similar connection can be found, for example, on a place of the socket of a forward final pipe / catalytic converter at 4-and 5-cylinder engines or after catalytic converters at the 6-cylinder engine.

 PERFORMANCE ORDER

  1. To unscrew three screw connections on a connecting flange.
  2. To watch sealing laying – it should not fall to a floor. The firm material can burst.
  3. At work with the 6-cylinder engine not to forget to establish a spring and the plug in the necessary sequence. Moment of an inhaling of bolts: 25 N • m.
  4. At an inhaling to watch that cheeks of a flange settled down in parallel each other.

Removal of a double bracket for pipe fastening

The double bracket for pipe fastening perfectly connects two pieces of a pipe with each other, allowing thus it is easy to separate them. Important: the double bracket cannot be applied to fastening of a pipe in the second time. It is necessary to replace it after weakening of the one and only boltovy connection.

 PERFORMANCE ORDER

  1. To notice the provision of a bracket for the subsequent installation.
  2. To weaken connections on a double bracket for pipe fastening; before it to process a carving means for rust removal.
  3. If to separate connection nevertheless it is impossible, it is necessary to divide a bolt/nut by means of the detachable car.
  4. Other possibility: to cut down a nut a chisel. The stretch moment for connections: 40 N • m.

Removal of a tightening bracket

 PERFORMANCE ORDER

  1. Before you will start to remove a tightening bracket, it is necessary to remember precisely its situation for installation: where show heads of bolts? There is a bracket horizontally or vertically?
  2. To watch sealing laying – it should not fall to a floor. The firm material can burst.
  3. At installation to watch that bracket halves well covered with themselves ledges on the pipe ends.
  4. To watch the provision of installation and to tighten connections by the moment of 25 N • m.

Division of the main and additional exhaust silencers

Only all-wheel drive models

In case of original system of production of exhaust gases of the all-wheel drive Audi both models of the exhaust silencer are connected among themselves by an integral piece of a pipe. For replacement of only one exhaust silencer this pipe is necessary for cutting.

 PERFORMANCE ORDER

    The piece and = 300 mm shows a place in which it is necessary to separate from each other the main and additional exhaust silencers of system of production of exhaust gases of all-wheel drive models.


  1. In order that there were no doubts, in which place it is necessary to saw, on an illustration the piece and = 300 mm is above shown.
  2. To cut a pipe the edging machine whenever possible at right angle.
  3. Because of a lack of a place under the car it is almost impossible to saw at even established exhaust silencers. It is better to remove together both exhaust silencers.
  4. Even if you need to change both exhaust silencers – as spare parts you receive both exhaust silencers separately.
  5. In this case they will be connected by a double bracket for fastening of pipes (also acquired as the spare part) – as is already described above. Moment of an inhaling of bolts: 25 N • m.

Assembly of system of production of the fulfilled gases

Slantwise established system of production of the fulfilled gases can become the reason of unpleasant loud low sounds. Therefore:

 PERFORMANCE ORDER

  1. Before an inhaling of connections to suspend an exhaust system freely on loops of fastening and to verify:
  2. All elements should be at some distance from a body.
  3. The tip should have everywhere identical distance from cut in a bumper.
  4. Fastening on a transmission to tighten without tension the moment of 25 N • m. To watch the correct installation of a sleeve and a spring.
  5. Preliminary inhaling of system of production of the fulfilled gases for an equilibration of deformations at the increased temperature: at all-wheel drive models the fixing loop behind on the main exhaust silencer should have 7-10 mm of a preliminary inhaling (an illustration below); at front-wheel models the bolt of a back suspension bracket of an exhaust pipe should act on 10 mm from rubber.
  6. Safety earrings of fixing rings are acting ends krepezhy – to turn approximately on 90 °. To watch that thus on fastening was clamped.
  7. In summary to tighten all connections of system of production of the fulfilled gases – beginning in front. The moments of an inhaling are described in the previous paragraph.

At the left: here the elastic suspension bracket of an exhaust system consisting of fastenings of a body (1), a fixing loop (2) and exhaust silencer (3) suspension brackets is shown. Safety earrings of fixing rings (these are the acting ends krepezhy) should be turned after installation approximately on 90 °.

On the right: at all-wheel drive models the fixing loop behind on the main exhaust silencer should have a preliminary inhaling and = 7-10 mm.