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

Measurement of pressure of compression

Measurement of pressure of compression. The device shown here for measurement of pressure of compression (kompressometr) with a measuring card is the tool for a workshop. Simpler control devices with the index, besides, they lower in the price will be suitable for house application.

Measurement of pressure of compression (compression) in cylinders of the engine gives an idea of, whether well still condense valves and piston rings. Power, starting qualities, and also a consumption of oil and fuel depend on it.


  1. To be passed a little that the engine reached working temperature. Piston rings condense better, if oil warm.
  2. To disconnect ignition and intake of fuel. It becomes in different models differently:
  3. 4-cylinder engine: to separate the plug on the electronic switchboard of the coil of ignition.
  4. To separate the multicontact plug on the central injection (the 66 kW engine) or plugs of all four vpryskovy nozzles (the 85 kW engine).
  5. 5-cylinder engine: to separate the plug on the electronic switchboard of the coil of ignition.
  6. To take out a safety lock No. 17 in the block of safety locks.
  7. 6-cylinder engine: to separate both plugs on the electronic switchboard of coils of ignition.
  8. To separate plugs of all six vpryskovy nozzles. In addition to separate holders of high-voltage wires of a fuel-supply line of the third and fourth cylinders.
  9. All models: to unscrew all spark plugs.
  10. To press a rubber cone of the device for measurement of pressure to a candle opening of the first cylinder (the sequence is not important, but it needs to be written down) or to the connecting cable conducting to a spark plug nest carving.
  11. To put the car on the parking brake, to install the handle of gear shifting of a mechanical transmission in neutral situation, and the handle of an automatic transmission respectively in situation "P".
  12. To ask the assistant to turn the engine a starter. The pedal of an accelerator has to be squeezed completely out thus (for the best filling of cylinders).
  13. When the indicator of pressure ceased to increase, write down it and to pass to the following cylinder.

Pressure indicators

The indicators of pressure of compression specified by Audi are given in the table:

Alphabetic reference
The 4-cylinder
5-cylinder NG
The 6-cylinder ABC/AAH
The set size of pressure of compression, bar
9 – 12
11 – 16
10 – 14
11 – 16
Minimum size, bar
Maximum difference of pressure, bar