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
   Removal and installation of the mechanical transmission (T)
   Noise in a transmission
   Automatic Transmission (AT)
   Electronic control of AKP
   Main transfer
   Power shafts
   Check of cuffs of power shafts
   List of malfunctions
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrical system
+ System of ignition
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Transmission and transmission

The transmission coordinates the speed of rotation of the engine and driving wheels thanks to various transfer numbers. Thus the driver influences the movement speed, possibility of acceleration and ability of the car to overcome rises. Depending on the established transmission the driver can choose the most suitable of five transfers or provide switching to an automatic transmission.

Mechanical transmission (T)

The torque from the engine through coupling arrives on primary shaft of a transmission. On this primary or driving to a shaft six cogwheels (including a reverse gear) which are in continuous gearing with six gear wheels on secondary to a shaft are located. These gear wheels can freely rotate until one of them at inclusion of a certain transfer does not unite to the corresponding gear wheel on primary to a shaft. The ratio of number of teeths of the corresponding couple of gear wheels forms necessary transfer number. Audi 80 is supplied, as well as all cars, "completely synchronized" transfers for the movement by the forward course. The reverse gear for prevention of a gnash at its inclusion is in addition synchronized even.

Gear wheels on primary and secondary to a shaft are located on needle bearings. Therefore between shaft and gear wheels there is no rigid connection. Gear wheels remain as it is already mentioned, always in gearing.

At gear shifting connection not between gear wheels, and between a gear wheel and shaft is formed. To synchronize turns of a shaft and a gear wheel, the following reception is used: one part of a shaft by means of frictional elements slides against part of other shaft.

Because of friction faster shaft is braked until at the synchronous movement creation of the connection transferring a torque does not become possible. As fractions of a second nevertheless are necessary for synchronization, the driver should not "tear" with violence the gear shifting handle, especially in the conditions of start of the cold engine at even dense transmission oil.

Problems with gear shifting

If transfers join with great difficulty or after a long trip switching becomes heavy, the reason of these malfunctions, most likely, coupling, but not a transmission is (see the list of malfunctions in the head Stsepleniye). The regulation of the mechanism of switching described below serves only to bring the switching lever into the correct position and by that to optimize the switching course.

Gear shifting adjustment


  1. To install the gear shifting lever in neutral situation.
  2. To turn off a spherical head.
  3. To raise by means of a knife a small plate in front of the lever of the parking brake and to weaken the top screw which is under it with crosswise shliyets. Now it is possible to remove a gear shifting lever casing.
  4. Under the car to weaken a little a six-sided bolt on the lower end the gear shifting lever in order that it was possible to turn the lever and a rod of a fork of gear shifting on the relation to each other.
  5. To install the gear shifting lever vertically and to expose it so that both ledges of the spherical hinge were at identical distance from the bearing case as it is shown on an illustration at the left below.
  6. Carefully to tighten the screw under the car not to change the adjusted situation.
  7. In summary to check functioning:
  8. The gear shifting handle has to be in the provision of idling at the level of the third or fourth transfer.
  9. To switch all transfers. To watch thus function of blocking of inclusion of a reverse gear.
  10. In case of need to weaken screws of the case of the hinge and slightly to turn it.

At the left: the distance between the spherical hinge and the case has to be identical both on the right, and at the left.

On the right: for regulation it is necessary to weaken under the car the screw designated by an arrow on system of drafts and control levers the gear shifting mechanism.