Audi A4, S4

since 2000 release

Repair and operation of the car

Audi A4, S4
+ Introduction
+ Governing bodies and methods of safe operation
+ Current leaving and service
- Engine
   Removal and installation of the top cover of the engine / lower protection of a motive compartment / stretcher
   Check of a compression in engine cylinders, identification of leaks
   Check of the engine by means of the vacuum gage
   + 4-cylinder petrol engines
   + 6-and 8-cylinder petrol engines
   + 4-cylinder diesel engines
   + 6-cylinder diesel engines
   - Engine lubrication system
      General information
      The applied motive oils. Oil consumption
      Oil pump and pallet of a case
      Check of pressure of oil and sensor of pressure
+ Cooling systems, heating and air conditioner
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Automatic transmission
+ Coupling, power shafts and differential
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

Engine lubrication system

General information

Engines are equipped with the circulating lubrication system under pressure.

The oil pump sucks in oil through a grid from the pallet of a case and gives it under pressure to system through an oil filter. At the exit from the oil pump there is a reducing valve. At increase of pressure above the established value the valve opens and the part of oil merges back in the case pallet.

Through the central opening of an oil filter oil comes directly to the main canal. At a contamination of an oil filter perepuskny the valve directs oil to system to not filtered.

From the trunk oil main channels for greasing of bearings of a cranked shaft branch off. Through inclined openings in a cranked shaft oil moves to shatunny bearings. For cooling of pistons oil is injected on them from below through nozzles.

At the same time oil through vertical galleries reaches heads of cylinders and arrives for greasing of bearings of camshafts and elements of valvate mechanisms of system of gas distribution.

Depending on engine capacity oil can be cooled in the additional oil cooler located sideways, at the case of an oil filter and included in an engine cooling system contour.