Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation

Audi 80/Avant
+ The description
- Engines
   Basic elements
   Greasing system
   Ventilation картера
   Visual check of the engine
   Обкатка the new engine
   Engine service life
   Nominal and maximum frequency of rotation
   Restriction of frequency of rotation
   Measurement of pressure of compression
   The list of malfunctions
   Проворачивание the engine
   Hydraulic pushers
   Works on gear belt ГРМ
   The list of malfunctions
   Removal and installation of a head of the block of cylinders
   Removal and engine installation
+ System of release of the fulfilled gases
+ 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


Hydraulic pushers

For check of hydraulic pushers it is necessary to press a plastic or wooden wedge (1) the unloaded hydraulic pushers (2). Metal tools with which it is possible to scratch easily a surface of a hydraulic pusher, it is impossible to apply.

For what hydraulic pushers are necessary?

Because of heating of the engine components of a drive of valves are extended. Therefore between a camshaft and тарельчатыми the small backlash that and at разогретом the engine valves were densely closed despite the cores which have become by a little longer should be pushers. In клапанном a drive, at old cars it was necessary to regulate this backlash, a so-called backlash through certain time intervals. At car Audi 80 similar action automatically occurs at each movement of valves thanks to so-called hydraulic regulation of a backlash in the valves, located in тарельчатых pushers. From here and the name hydraulic pushers. The work description look in this chapter above.

Knocks of valves

Knocking noise in the field of a head of the block of cylinders (also see above in this chapter) specify in one or several defective hydraulic pushers.

Knock of valves can arise, however, and at пролностью serviceable hydraulic pushers, if:

    Supply of pushers by oil is not provided yet – the engine has not enough got warm. The car shortly before that worked in full loading at high external temperatures. The car long time not эскплуатировался. In this case knock of valves should stop most later at achievement by the engine of working temperature. At very low level of oil the oil pump sometimes involves air.

Search of a faulty hydraulic pusher


    To start the engine and to leave to work until the electric fan of system of cooling will not earn for the first time. To increase frequency of rotation approximately to 2500 rpm on two minutes. If knock of valves does not stop, to stop the engine and to uncover heads of the block of cylinders. The first cylinder to establish on ВМТ the ignition moment. Both тарельчатых a pusher near the first cylinder to press down downwards a wooden wedge. If the pusher moves more than on 0,1 mm, it is necessary to replace it (as pushers cannot be repaired). To repeat this procedure with other cylinders. For this purpose to expose the corresponding cylinder in position ВМТ. ВМТ it is exposed in the event that on the controllable cylinder camshaft cams in regular intervals show upwards.

Replacement of a hydraulic pusher


    To remove a camshaft. To extend old тарельчатый a pusher. A few to oil directing a pusher and to insert a pusher. To put a camshaft. After installation new тарельчатого a pusher it is impossible to get the engine during 30 mines! It should "sit down" at first. Otherwise valves can face pistons.