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
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications


The Audi 80 car is set in motion by engines of various designs and number of cylinders. The palette stretches from 4-to 6-cylinder motors. The number of vpryskovy systems is even more. It is necessary to add two more essentially various diesel engines to the petrol engines described in this management. So in variety the shortcoming is not present, as the following table proves.

Various degrees of power:

Marking of the engine
Number of cylinders
Power, kW (hp)
66 (90)
85 (115)
98 (133)
110 (150)
128 (174)
At rpm
Volume, cm 3
Preparation of gas mixture

Signs of engines

The 4-cylinder engine in a section

1 – camshaft;
2 – hydraulic pushers;
3 – tension roller;
4 – piston;
5 – gear belt;
6 – intermediate shaft;
7 – a pulley on cranked to a shaft;

8 – pump of cooling liquid;
9 – cover of a head of the block of cylinders;
10 – spark plug of the fourth cylinder;
11 – ignition distributor;
12 – rod;
13 – oil pump.

This motor which is initially designed for Audi 80 is used also to Audi 100 and to the folksvagenovsky models Golf, Jetta, Passat. Its major constructive signs: the 4-cylinder engine with the top arrangement of a camshaft. The drive of valves is carried out by means of hydraulic dish-shaped pushers. The intermediate shaft gives the oil pump and the distributor of ignition. The drive of distributive and intermediate shaft is carried out by means of a gear belt.

The 5-cylinder engine in a section

1 – piston;
2 – valve;
3 – hydraulic pushers;
4 – gear pulley of a belt of a camshaft;
5 – camshaft;
6 – head of the block of cylinders;
7 – block of cylinders of the engine;

8 – oil pallet;
9 – cranked shaft;
10 – inlet tube of the oil pump;
11 – oil pump;
12 – gear pulley of a belt of a cranked shaft;
13 – a pulley of klinoremenny transfer with a damper on cranked to a shaft.

The main constructive signs of the 4-cylinder engine correspond also to the 5-cylinder engine presented for the first time in 1976 on Audi 100. It is enough to call only two common features – this engine is also supplied with a gear belt for the drive of a camshaft and the pump of cooling liquid, and in this engine for reduction of valves dish-shaped hydraulic pushers are used.

The design of a cranked shaft of the 5-cylinder engine is especially interesting: shatunny necks of a cranked shaft are at an angle in 72 ° on the relation to each other, for each cylinder on a shaft stand on two counterbalances. Further: specially organized imbalance of a flywheel and also a damper on its forward end serve for absorption of tortional fluctuations.

The 6-cylinder engine in a section

1 – inlet gas pipeline;
2 – package of coils of ignition;
3 – gear belt;
4 – poliklinovy belt;
5 – a pulley with a damper on cranked to a shaft;
6 – oil pump
7 – inlet tube of the oil pump;

8 – cranked shaft;
9 – rod;
10 – piston;
11 – hydraulic pushers;
12 – valve;
13 – camshaft;

Newly Audi 100 developed to representation of the fourth generation in 1991 the 6-cylinder V-shaped engine represents very compact unit which is specially created for a longitudinal arrangement. Two camshafts of the top arrangement put in action by gear belts operate valves by means of dish-shaped pushers. In space between heads of cylinders the final gas pipeline is placed.

The 2,8-liter version is equipped with the inlet gas pipeline with a changeable length of a path which changes the active length of inlet channels depending on rotation frequency range. Thus in all ranges of frequencies of rotation the optimum torque of the engine is reached. It is worth mentioning also system of ignition without distributor which is in more detail described in the head System of ignition.