Audi 80/Avant (B4)

since 1991-1995 release

Repair and operation of the car



Audi 80/Avant
+ Technical specification
- Engines
   Basic elements
   Lubrication system
   Ventilation of a case
   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 installation of the engine
+ 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
+ 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





Lubrication system

In the engine it is necessary to grease a number of bearings and steam of friction. Engine oil needs to be pumped over under pressure there is a duty of the oil pump. It sucks away oil from the oil pallet by means of an inlet tube and squeezes out it in an oil filter of the trunk oil main.

If the filter was not replaced in time and paper of the filter is hammered with dirt, then the safety valve bypassing an oil filter opens – supply with oil is provided.

From the filter the greasing substance gets through openings in the block of cylinders to places of lubricant of a bent shaft, intermediate shaft (only 4-cylinder engine) and heads of the block of cylinders with the camshaft. Through openings oil flows down back in the oil pallet from where the oil pump can take away it for the following cycle again.

Oil pump

Oil pump of the 5-cylinder engine.

1 – internal rotor; 2 – external rotor; 3 – safety valve.

The removed oil pump of the 4-cylinder engine consists of two gear wheels hooked with each other (shooters symbolize the directions of rotation). Engine oil is soaked up via the camera (1), oil under pressure gets via the delivery camera (2) to places of lubricant in the engine.

In the mode of full loading through the engine in a minute there pass 30 l of oil:

  • In the 4-cylinder engine already mentioned intermediate shaft is a driving element for an ignition distributor shaft which transfers rotation to the oil pump.
  • In 5-and the 6-cylinder engine the oil pump is located in the direction of the movement in front directly on cranked to a shaft.
    The way of operation of oil pumps in different Audi engines also differs.
  • The 4-cylinder engine is supplied with the gear oil pump. Two gear wheels of the identical size entering each other just pump over oil from the party of an admission to the party of forcing.
  • 5-and 6-cylinder engines are greased with the rotor oil pump of the Eaton system. Here the external gear wheel is located in an internal gear wheel (these are both rotors). Thanks to a special form and not coaxial arrangement of an internal rotor at joint rotation of both gear wheels new and new hollows in which the lowered pressure dominates are formed. Thanks to the rotating gear wheels oil is pumped over to the output party of the pump and from there to lubricant canals.

Oil temperature

Oil temperature is very important for reliable operation of the engine. This information, however, is available to the driver of Audi only by means of the built-in additional devices. For the purpose of comparison temperature of engine oil on a flange of an oil filter or in the oil pump is interesting; there oil is the coldest. On piston rings, on the contrary, temperatures to 300 °C can dominate.

If your car is equipped with the oil thermometer: Audi calls temperature in 145 °C in the oil pallet as the most admissible. Provided that the high-quality, conforming to requirements engine oil is applied.

However and too low temperature of oil is harmful to the engine. In this case oil did not reach the full greasing ability yet. Therefore you after cold start whenever possible should not accelerate the engine over 3500 rpm until temperature of oil does not rise approximately to 60 °C. It is considered that engine oil in comparison with cooling liquid needs approximately twice more time before it reaches the working temperature.

Oil pressure

If in your car the oil manometer is built in, then you can check oil pressure within the accuracy of measuring devices. Check conditions: seasonal oil of the class SAE 20 W/20, 80 °C the oil temperature, the engine rotates from 2000 rpm. You have to receive the following indicators:

 Engine
Oil pressure at 2000 rpm

Oil pressure maximum (to increase rotation frequency)

4-cylinder
min. 2,0 bars
(there are no data)
5-cylinder
min. 2,0 bars
max. 5,3 – 6,3 bars
6-cylinder
max. 4,5 – 6 bars

(there are no data)

However behind oil pressure in the Audi car fine observation and without devices is conducted. Two switches with a hydraulic actuator care for it. In more detail you learn about this control system in the head Pribory and auxiliary devices.








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