Audi A4

since 1994 of release

Repair and car operation

A4 Audi
+ Running gear
+ Regular servicing
- Engines
   Capacity steps
   Engine signs
   Technology of the engine, maintenance and repair
   Greasing system
   Exhaust ventilation of a case
   Visual control of the engine
   Engine service life
   Nominal and maximum frequency of turns
   Restriction of number of turns
   Measurement of pressure of compression
   The help at malfunctions
   Works on a gear belt
   The help at malfunction
   Installation and dismantle of a head of the block of cylinders
   Installation and engine dismantle
+ Turbo-supercharging
+ exhaust System
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and absorption channels
+ injection System
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ ignition System
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics

Greasing system

Labyrinth: the main idea of the new three-section case designed for Audi A4.

Here in a cut the oil radiator (2) in which engine oil, in the engine with working volume of 1,6 l is cooled is shown. All Audi engines are supplied with such oil radiator. Cooled oil is brought through a junction point «1» – and the following knot – on an oil radiator and cools engine oil at the expense of the plates of a radiator visible in this photo. Oil is forced via the oil filter (3).

Oil pump

At full gas the oil pump pumps over via the engine about 30 l of oil a minute:

  • In the four-cylinder engine the intermediate shaft puts in action a shaft which lower part puts in action the oil pump.
  • In the 16-cylinder engine the oil pump is established on the crankshaft ahead in the direction of travel.
    Method of operation of pumps in our Audi engines too the different.
  • In the four-cylinder engine there is a gear oil pump. Two gear wheels which were linked with each other of the identical size simply scoop oil from the soaking-up party to the forcing party.
  • The six-cylinder engine is greased with the rotor oil pump of system of Eton. In this case the gear wheel with an external teeth is placed in a gear wheel with an internal teeth (these are both rotors). At the expense of giving of a special form and an excentric arrangement of an internal rotor the effect at which at joint rotation of both gear wheels new spaces with the lowered pressure are constantly created is reached. Thus, engine oil is soaked up. From rotating gear wheels oil is wrung out to the final party of the pump and from there to lubricant canals.

Oil temperature

For good "health" of the engine the temperature of oil has crucial importance. The driver of Audi can receive this information only from the built-in additional devices. Let's compare for interest engine temperature on a flange of the oil filter or on the oil pump; there greasing temperature the lowest. On the contrary, on piston rings the temperature of oil reaches 300 °C.
If you go by the car with the thermometer for measurement of temperature of oil: Audi considers 145 °C in a case in the most admissible temperature. Though a condition of it is availability of high-quality oil according to the instruction.

Too low temperature of oil is harmful to the engine also. In this case oil yet did not reach the full lubricant ability. Whenever possible, after start of the cold engine do not lift turns above 3500 in mines until oil will not be warmed up approximately to 60 °C. The reference point considered that fact that oil needs twice more time, than cooling liquid to reach the working temperature.

Pressure of oil

If in your Audi A4 the sensor of pressure of oil or if you can connect to the engine the sensor of pressure of oil in a workshop instead of the switch of pressure of oil is built in, it is possible to supervise independently its pressure within accuracy of the measuring device. Check condition: temperature of oil of 80 °C. The following indicators should be received:

  • Pressure of oil idling: 1–2,5 bar.
  • Pressure of oil at 3000 rpm: 3–5 bar.

Pressure of oil is also well supervised without the device in Audi. In more detail you learn about it in head Tools and devices.