Audi A4

since 1994 release

Manual of the car

Audi A4
+ Running gear
+ Regular servicing
- Engines
   Power steps
   Engine signs
   Technology of the engine, maintenance and repair
   Lubrication system
   Exhaust ventilation of a case
   Visual control of the engine
   Engine service life
   Nominal and maximum frequency of turns
   Restriction of speed
   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 dismantle of the engine
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ System of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics


Engine signs

With a working volume of 1,8 l the chain wheel (4) of a final cam-shaft transfers the frequency of rotation of a two-row chain (2) on a chain wheel (4) of an inlet cam-shaft in a five-valve head of the block of cylinders of the engine. For elimination of noise from work of chains the hydraulic natyazhitel of chains serves (3).

Type of a five-valve head of the block of cylinders from below: in the photo it is shown what big cross section of a stream can be created, opening, final (1) and inlet (2) valves.

Four-cylinder engine

The foundation of our four-cylinder engine is laid in 1972 when Audi laid the foundation of the current situation in the market, having presented the new Audi 80 model. Professionals were admired then not only by a body and a running gear, but also the new engine. Its major constructive signs: the four-cylinder engine with the cam-shaft located from above, valves are put in action by tarelochny pushers. At the oil pump and the distributor the drive from an intermediate shaft. The drive of a cam-shaft and intermediate shaft is carried out by means of a gear belt.

From the former engine remained a little, but nevertheless the main lines of the krivoshipny mechanism remained the same. Especially for application in Audi A4 basic changes are made to a head of the block of cylinders: the engine with a working volume of 1,6 l for improvement of gas exchange received a so-called head with a cross stream of gases. Fresh gases arrive on the left side of the engine, and fulfilled are produced on the right side. In addition new engine in 1,6 l received very long inlet pipelines for ensuring the maximum traction effort (the maximum torque) in the lower range of turns.

The similar aim was pursued in a design of five-valve heads. Here at the expense of the bigger section of a stream which five valves allow to receive gas exchange in the wide range of turns of the engine also improves.

The turbo-supercharging in 1,8 T creates powerful torque on the lowest turns. Power which usually is expected only for much higher classes of working volumes is created.

In general all four-cylinder engines create conditions for the weakening trip, the palette of power is extremely convincing on all range of turns. At the same time fuel consumption remains at pleasantly low level at the expense of small working volume.

Six-cylinder engine

The new six-cylinder engine developed in 1991 for representation of the last generation of Audi 100 represents very compact power plant and as if it is created for typical installation in the Audi models lengthways before a forward axis. Two cam-shafts located from above with drives from gear belts operate valves by means of tarelochny pushers. In space between heads of cylinders the inlet collector is placed. The version with an engine capacity of 2,8 l is supplied with the switching inlet collector which changes the active length of inlet channels depending on the range of turns of the engine. Thus, the optimum torque of the engine in all ranges of turns is reached.

For Audi A4 the six-cylinder engine was supplied with new system of circulation of oil and a new, three-section case. The system of circulation of oil is designed in such a way that pressure of oil is regulated after an oil filter and the oil heater.

Thanks to it in places of lubricant that pressure which creates the adjusting valve is created.