Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation



Audi 80/Avant
+ The description
+ Engines
- System of release of the fulfilled gases
   Check of a suspension bracket and condition of system of release of the fulfilled gases
   Replacement of system of release of the fulfilled gases
   Removal of separate elements
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and воздухозаборные channels
+ Injection system
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Antiblocking system of brakes
+ Wheels and tyres
+ Kuzovnaja electrosystem
+ Ignition system
+ Illumination
+ 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 ljambda-probe (1) and (3) suspension bracket of a forward exhaust pipe supplied with a spring.

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

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

On the right: at installation tightening скобы (arrow) it is necessary to watch its position (horizontally or vertically).

It is more low described how to disconnect from each other separate elements of system of release of the fulfilled gases. For repeated installation last section about assemblage of system of release of the fulfilled gases is important.

 The help: 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.

Branch 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 a 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" then from a carving распорного a bolt.
  3. New nuts from Ťa set for fastening of system of release of the fulfilled gasesť consist also of this "soft" material. So it is not necessary to apply any other nuts from a house collection. The inhaling moment: 35 Н•м.

Ljambda-probe removal

Лямбда (oxygen) - the probe is necessary for removing at replacement каталитического neutralizer (or the probe).

 PERFORMANCE ORDER

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

Easing of a triangular flange

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

 PERFORMANCE ORDER

  1. To turn away three screw connections on a connecting flange.
  2. To watch a sealing lining – 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. The moment of an inhaling of bolts: 25 Н•м.
  4. At an inhaling to watch that flange cheeks settled down in parallel each other.

Removal double скобы for pipe fastening

Double скоба for pipe fastening perfectly connects two pieces of a pipe with each other, allowing thus it is easy to separate them. Important: double скобу it is impossible to apply to pipe fastening in the second time. It it is necessary to replace already after easing one and only болтового connections.

 PERFORMANCE ORDER

  1. To notice position скобы for the subsequent installation.
  2. To weaken connections on double скобе 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 moment of a stretch for connections: 40 Н•м.

Removal tightening скобы

 PERFORMANCE ORDER

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

Division of the basic and additional mufflers

Only all-wheel drive models

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

 PERFORMANCE ORDER

    The piece and = 300 mm shows a place in which it is necessary to separate from each other the basic and additional mufflers of system of release of the fulfilled gases of all-wheel drive models.


  1. 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 place lack under the car it is almost impossible to saw at even established mufflers. It is better to remove together both mufflers.
  4. Even if you need to change both mufflers – as spare parts you receive both mufflers separately.
  5. In this case they will be connected double скобой for fastening of pipes (also got as запчасть) – as is already described above. The moment of an inhaling of bolts: 25 Н•м.

Assemblage of system of release of the fulfilled gases

Slantwise established system of release 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 on 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 pressure the moment 25 Н•м. To watch correct installation of a sleeve and a spring.
  5. Preliminary inhaling of system of release of the fulfilled gases for an equilibration of deformations at the raised temperature: at all-wheel drive models the fixing loop behind on the basic muffler 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 крепежей – to turn approximately on 90 °. To watch that thus on fastening has been clamped.
  7. In summary to tighten all connections of system of release of the fulfilled gases – beginning in front. The inhaling moments 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 suspension brackets of the muffler (3) is shown. Safety earrings of fixing rings (these are the acting ends крепежей) should be turned after installation approximately on 90 °.

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