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
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ System of injection
+ Coupling
+ Transmission and transmission
- Suspension bracket and steering
   Control of a condition of a casing of the steering mechanism
   Check of dustproof covers and side play of tips of cross steering drafts
   Check of dustproof covers of hinges of a forward suspension bracket
   Check of a side play of steering
   Check of a maple or poliklinovy belt
   Check of level of working liquid
   Check of a side play of the wheel bearing
   Shock-absorbers
   List of malfunctions
   Adjustment of angles of installation of wheels
   Measurement of adjustment of angles of installation of wheels
   List of malfunctions
   Repair of a running gear and steering
   Repair of a forward suspension bracket
   Repair of a back suspension bracket
   Steering
   Steering repair
   List of malfunctions
   Adjustment of the steering mechanism
   Filling with liquid and pumping of a hydraulic system of the power steering
   Safety cushion
   Requirements of safety measures
+ 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





Repair of a forward suspension bracket

Very many elements of a forward suspension bracket of wheels can be removed independently and again to establish. Devices from a workshop nevertheless are necessary for carrying out certain works. The damaged parts of a suspension bracket cannot be corrected at all and furthermore to weld, they need to be replaced essentially new.

Removal of a forward depreciation rack

Removal of a depreciation rack above. After removal of a cover (1) it is possible to weaken a nut of fastening of a depreciation rack with the help of a cap key (3). For this purpose to hold a shock-absorber rod with a face six-sided key (2).

Removal of a depreciation rack below. Bolt connections of draft of the stabilizer (1) and bolt connections with the case of the wheel bearing (2 and 3) are shown.

At removal of a depreciation rack it is necessary to consider: if to disconnect it from the case of the wheel bearing, then it is necessary to make anew adjustment of angles of installation of wheels that is possible only at the measuring stand in a workshop.

For this reason we describe removal of a depreciation rack together with the case of the wheel bearing here.

One more addition: in a workshop apply a face wrench of VW 3078 to an inhaling of the top nut of a depreciation rack of mechanics. For want of something better for performance of these works it is possible to use a cap wrench and own intuition.

 PERFORMANCE ORDER

  1. To get new самоконтрящуюся a nut and a new tightening bolt of the hinge of an independent suspension bracket.
  2. At the car standing on the earth to weaken the central fixing bolt of a power shaft in a wheel nave (in the middle of a wheel).
  3. To weaken bolts of fastening of a wheel.
  4. To evenly raise the car in front that the stabilizer was not loaded. To provide fixing of the car.
  5. To remove a wheel.
  6. To disconnect draft of the stabilizer from both depreciation racks, to wring out the stabilizer up.
  7. To disconnect a bracket of the disk brake mechanism and to strengthen it on a body by means of a wire – the pipeline of the brake drive remains connected.
  8. To separate the hinge of cross steering draft.
  9. To remove tightening a bolt of the axial hinge at the very bottom at a depreciation rack.
  10. Mount to extend a hinge finger from a depreciation rack. Thereby the depreciation rack and the cross lever of a suspension bracket are divided. At the same time it is impossible to expand vents in the case of the wheel bearing, for example with the screw-driver at all.
  11. To turn out a wheel and to take a power shaft from a wheel nave.
  12. To uncover a glass of a depreciation rack in a motor compartment.
  13. To remove above from a rod a nut of fastening of a depreciation rack. For this purpose to hold a rod with a key for an internal hexagon.
  14. At the same time to hold a depreciation rack from below.
  15. To take out a depreciation rack in the direction down and at the same time completely to remove it from a power shaft.
  16. To apply to installation new самоконтрящиеся nuts and new tightening a suspension bracket hinge bolt.
  17. To establish tightening a bolt so that its head was directed forward in the direction of travel.
  18. Inhaling moments: nut of the top fastening of a depreciation rack: 60 N • m, nut of cross steering draft: 30 N • m, tightening bolt of the hinge of an independent suspension bracket: 50 N • m, connecting draft of the stabilizer on a depreciation rack: 40 N • m.
  19. If the same depreciation rack and at the same time the bolts connecting the case of the wheel bearing and a depreciation rack is established remain all the time clamped, then it is not necessary to correct adjustment of angles of installation of wheels.

Elements of a forward depreciation rack and sequence of their installation

1 – spring;
2 – plate of a spring;
3 – bearing of a depreciation rack;
4 – buffer;

5 – protection cover;
6 – carving cover:
7 – shock-absorber;
8 – 10 – pro-rate, cover.


Suspension bracket of a forward wheel of the Audi 80 car at a short distance

1 – case of a depreciation rack;
2 – bolt connections of the case of a depreciation rack and case of the wheel bearing;
3 – case of the wheel bearing;

4 – axial hinge;
5 – tightening bolt;
6 – lower cross lever of a suspension bracket.

Sleva: coupling brackets are necessary in order that at the removed depreciation rack to separate a spring from the shock-absorber.

On the right: the illustration shows tightening a bolt of the hinge of a suspension bracket (1) by which the hinge of a suspension bracket (3) is strengthened in the case of the wheel bearing. Further are designated: fixing nuts (2) by which the hinge of a suspension bracket is connected with the lower cross lever.

Replacement of the forward shock-absorber

For carrying out this work (at the removed depreciation rack) it is necessary the device for a tension (compression) of a spring. You will need at least two strippers, it is even better – three. Without use of the device for a tension of a spring it is impossible to weaken a shlitsevy nut above on a shock-absorber rod because the spring is in a condition of a strong preliminary tension. Otherwise compound details of a depreciation rack will scatter in the parties as at explosion – danger of accident is big!

Besides, the uncompressed spring cannot already be established into place. Natyazhiteli of springs can be got in shops of spare parts. Further the following special tools will be required: VW 524 key for weakening of a shlitsevy nut and the tool 40-201 A for weakening of a carving cover over the shock-absorber. If you do not have them, then it is necessary to help itself a big pipe key.

 PERFORMANCE ORDER

  1. To remove a depreciation rack (see the previous section).
  2. To clamp a depreciation rack through wooden klinyshka at height of the lever of a rotary fist in a vice. Never clamp for the cylindrical site, otherwise you crush a depreciation rack.
  3. To establish a natyazhitel of springs at rounds of a spring and to squeeze a little it.
  4. In order that the natyazhitel of springs did not slide off, it is necessary to paste over these rounds with a kleyushchy tape if necessary.
  5. Now to weaken a shlitsevy nut at the top of a depreciation rack. To hold a shock-absorber rod with a wrench.
  6. To remove a spring together with the bearing of a depreciation rack and additional details.
  7. To remove a carving cover above at the shock-absorber.
  8. To extend the shock-absorber.
  9. At the plant liquid shock-absorbers are installed. In this case it is necessary to pour out old liquid of the shock-absorber (special waste!) and to clean its rod.
  10. To establish a new cartridge of the shock-absorber without liquid.
  11. You watch the sequence of installation of components in the drawing on the right above. Further pay attention: color marking of springs specifies a bottom.
  12. Inhaling moments: carving cover of the boss of the shock-absorber: 150 N • m, a shlitsevy nut on a shock-absorber rod: 50 N • m.

Removal of the forward wheel bearing

The wheel bearing is pressed by the external ring in the case, in an internal ring the wheel nave is pressed. The new wheel bearing cannot be driven on the place the hammer at all, otherwise you "establish" the following damage together with the bearing. Therefore it is better to remove only a depreciation rack and to disconnect a disk of the brake mechanism, and also a casing. And actually you have to entrust removal and installation of the bearing to a workshop at which disposal the repair press is.

Replacement of the axial hinge

 PERFORMANCE ORDER

  1. To get new самоконтрящуюся a nut and a new tightening bolt of the hinge of an independent suspension bracket.
  2. To evenly raise the car in front that the stabilizer was not loaded. To provide fixing of the car.
  3. To remove a tightening bolt of the hinge of a suspension bracket at the very bottom of a depreciation rack.
  4. Mount to squeeze out a finger of the hinge of an independent suspension bracket at a depreciation rack. At the same time it is impossible to expand vents in the case of the wheel bearing, for example with the screw-driver at all.
  5. To note adjusting position of the hinge on the lower cross lever of a suspension bracket.
  6. To turn off fixing nuts of the axial hinge below from the lower cross lever of draft. To remove the hinge.
  7. When fastening the axial hinge to consider the marks made at removal, in this case adjustment of angles of installation of wheels will remain approximately former.
  8. Not to forget lining plates for fixing nuts.
  9. Inhaling moments: nuts of the hinge of an independent suspension bracket it is necessary to tighten the moment of 65 N • m, nuts of a tightening bolt the moment of 50 N • m.
  10. To make adjustment of angles of installation of wheels in a workshop.

Removal of the cross lever of a suspension bracket

 PERFORMANCE ORDER

  1. It will be necessary to replace everything самоконтрящиеся nuts, and also the bolts connecting support of the cross lever of a suspension bracket and a beam of the bridge.
    To remove the cross lever of a suspension bracket or together with the axial hinge, or without it. What bolts need to be weakened in that or in other case, describes the previous section.
  2. To turn out nuts of internal plugs of a support of the cross lever of a suspension bracket.
  3. If internal bearings of the cross lever of a suspension bracket already wore out, then before installation of the lever it is better to press at once (in a workshop) new.
  4. Installation: to strengthen the cross lever of a suspension bracket outside on the case of the wheel bearing or on the hinge of an independent suspension bracket. You will find the inhaling moments in the previous section.
  5. At first to tighten nuts of internal bearings of the cross lever of a suspension bracket poorly. It is necessary to tighten up to the end only when the car stands on wheels. Otherwise bearings of the cross lever can warp.
  6. Moments of an inhaling of nuts of internal bearings of the cross lever of a suspension bracket: at first
    40 N • m, in conclusion to turn on 1/4 turns (90 °).

The arrow indicates the lower fixing bolt under a back depreciation rack at front-wheel models.

The top fastening of a depreciation rack on a back axis at front-wheel models. Shooters point to four fixing bolts of a depreciation rack, the figure (1) designates a depreciation rack.








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