Audi 80/Avant (B4)

since 1991-1995 of release

Repair and car operation


Audi 80/Avant
+ Technical specification
- Engines
   Basic elements
   Greasing system
   Case ventilation
   Visual check of the engine
   Running in of the new engine
   Engine service life
   Nominal and maximum frequency of rotation
   Restriction of frequency of rotation
   Measurement of pressure of compression
   List of malfunctions
   Provorachivaniye of the engine
   Hydraulic pushers
   Works on the GRM gear belt
   List of malfunctions
   Removal and installation of a head of the block of cylinders
   Removal and engine installation
+ 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
+ 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



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 engine heating components of a drive of valves are extended. Therefore between a camshaft and tarelchaty pushers there should be a small gap in order that and at the warmed-up engine valves densely were closed despite the cores which have become a little longer. In the valve a drive, at old cars it was necessary to regulate this gap, a so-called gap through certain periods. At the Audi 80 car similar action automatically occurs at each movement of valves thanks to so-called hydraulic regulation of a gap in the valves, located in tarelchaty pushers. From here and name «hydraulic pushers». The description of work 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) indicate one or several defective hydraulic pushers.

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

  • Supply of pushers by oil is not provided yet – the engine got warm not enough.
  • The car shortly before that worked in full loading at high external temperatures.
  • Car long time not эскплуатировался. In this case knock of valves should stop the latest 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

 PERFORMANCE ORDER

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

Replacement of a hydraulic pusher

 PERFORMANCE ORDER

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