Audi 80/Avant (B4)

since 1991-1995 release

Repair and operation of the car



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
+ System of injection
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrical system
+ System of ignition
+ Lighting
+ Signaling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
+ Specifications





Removal of separate elements

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

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 shown in this illustration.

Sleva: the double bracket for fastening of a pipe (shooter) has to 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 monitor its provision (horizontally or vertically).

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

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

Separation of an exhaust pipe from a final collector

 PERFORMANCE ORDER

  1. Expansion 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 connection nuts spray for removal of a rust or (often it is even better): To cut down nuts a sharp chisel. As a rule, they consist of very soft material with the enclosed carving part. A carving part will need to be "knocked over" separately then from a carving of an expansion bolt.
  3. New nuts consist of "set for fastening of system of production of exhaust gases" also from this "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 needs to be removed when replacing 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 the probe.
  3. At installation a lambda probe it is necessary to grease it with lubricant means G 5 of a set of the workshops Audi. At the same time lubricant should not get to a probe case cut. Inhaling moment: 50 N • m.

Weakening of a triangular flange

Similar connection can be found, for example, on the 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 turn off three screw connections on a connecting flange.
  2. To monitor sealing laying – it should not fall to a floor. Solid material can burst.
  3. During the work with the 6-cylinder engine not to forget to establish springs and plugs 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 fastening of a pipe

The double bracket for fastening of a pipe perfectly connects two pieces of a pipe with each other, allowing at the same time it is easy to separate them. Important: the double bracket cannot be applied to fastening of a pipe for the second time. It needs to be replaced after weakening of the one and only bolt connection.

 PERFORMANCE ORDER

  1. To notice the provision of a bracket for the subsequent installation.
  2. To weaken connections on a double bracket for fastening of a pipe; before it to process a carving means for removal of a rust.
  3. If it is impossible to separate connection nevertheless, then it is necessary to divide a bolt/nut by means of the detachable car.
  4. Other opportunity: 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 begin 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 monitor sealing laying – it should not fall to a floor. Solid material can burst.
  3. At installation to watch that bracket halves well covered with themselves ledges on the ends of a pipe.
  4. To monitor the provision of installation and to delay connections the moment of 25 N • m.

Division of the main and additional mufflers

Only all-wheel drive models

In case of original system of production of exhaust gases of the all-wheel drive Audi models both mufflers are connected among themselves by an integral piece of a pipe. For replacement only of one muffler this pipe needs to be cut.

 PERFORMANCE ORDER

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


  1. In order that there were no doubts in what place it is necessary to saw, on an illustration the piece and = 300 mm is above shown.
  2. To cut a pipe the cut machine whenever possible at right angle.
  3. Because of a lack of the place under the car it is almost impossible to saw at even the installed 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 by a double bracket for fastening of pipes (also acquired as the spare part) – as it is already described above. Moment of an inhaling of bolts: 25 N • m.

Assembly of system of production of the fulfilled gases

Slantwise the installed 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 the exhaust system freely on loops of fastening and to verify:
  2. All elements have to be at some distance from a body.
  3. The tip has to have identical distance from a cut in a bumper everywhere.
  4. Fastening on the transmission to tighten without tension the moment 25 N • m. To monitor the correct installation of a sleeve and 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 muffler has to 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 has to act on 10 mm from rubber.
  6. Safety earrings of fixing rings are speakers the ends krepezhy – to turn approximately on 90 °. To watch that at the same time on fastening was clamped.
  7. In conclusion 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.

Sleva: here the elastic suspension bracket of the exhaust system consisting of fastenings of a body (1), fixing loop (2) and suspension bracket of the muffler (3) is shown. Safety earrings of fixing rings (these are speakers the ends krepezhy) have to be turned after installation approximately on 90 °.

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








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