Audi 80/Avant (B4)

since 1991-1995 release

Repair and operation of the car

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 is a duty of the oil pump there. 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, 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 greasing of a cranked shaft, an intermediate shaft (only 4-cylinder engine) and heads of the block of cylinders with a camshaft. Through openings oil flows down back in the oil pallet, from where the oil pump can take away again it for the following cycle.

Oil pump

Through the engine in a minute pass 30 l of oil in the mode of full loading:

• 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 simply 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 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 is however 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 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, 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:

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