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
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ injection System
+ Coupling
- Transmission and transmission
   Removal and installation of a mechanical transmission (KP)
   Noise in a transmission
   Automatic transmission (AKP)
   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 electrosystem
+ ignition System
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Transmission and transmission

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

Mechanical transmission (KP)

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 then while one of them at inclusion of a certain transfer will not incorporate to the corresponding gear wheel on primary to a shaft. The ratio of number of teeths of the corresponding pair of gear wheels forms necessary transfer number. Audi 80 is supplied, as well as all cars, "completely synchronized" transfers for movement by a forward course. The reverse gear for gnash prevention 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 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 shaft and gear wheel turns, the following reception is used: one part of a shaft by means of frictional elements slides against a part of other shaft.

Because of a friction faster shaft is braked, until then while at synchronous movement there is no possible a creation of connection transferring a torque. As fractions of a second nevertheless are necessary for synchronization, the driver does not need to "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 coupling, instead of a transmission (see the list of malfunctions in head Coupling), most likely, is. 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 a switching course.

Gear shifting adjustment


  1. To establish 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 was under it with a crosswise shliyets. Now it is possible to remove a casing of the lever of gear shifting.
  4. Under the car a few to weaken a six-sided bolt on the bottom 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 establish 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 should be in the provision of idling at 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 should 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.