Audi 80/Avant (B4)

since 1991-1995 of release

Repair and car operation

Audi 80/Avant
+ Technical specification
- Engines
   Basic elements
   Greasing system
   Case ventilation
   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 engine installation
+ System of production of the fulfilled gases
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ injection System
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrosystem
+ ignition System
+ 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 (компрессометр) with a measuring card is the tool for a workshop. Simpler control devices will be suitable for house application with the index, besides, they lower in the price.

Measurement of pressure of compression (compression) in cylinders of the engine provides guidance on volume, whether well still condense valves and piston rings. The capacity, starting qualities, and also a consumption of oil and fuel depend on it.


  1. A few to be passed, 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 tip on the electronic switchboard of the coil of ignition.
  4. To separate the multicontact tip on the central injection (the engine in capacity of 66 kW) or tips of all four vpryskovy nozzles (the engine in capacity of 85 kW).
  5. 5-cylinder engine: to separate the tip 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 tips on the electronic switchboard of coils of ignition.
  8. To separate tips of all six vpryskovy nozzles. In addition to separate holders of high-voltage wires топливопровода the third and fourth cylinders.
  9. All models: to unscrew all spark plugs.
  10. To press a rubber cone of the device for pressure measurement to a candle opening of the first cylinder (the sequence is not important, but she is necessary for writing down) or to the connecting cable conducting to a carving of a nest of a spark plug.
  11. To put the car on the parking brake, to establish the handle of gear shifting of a mechanical transmission in neutral situation, and the handle of an automatic transmission respectively in the situation "R".
  12. To ask the assistant to turn the engine a starter. The pedal of an accelerator should be thus squeezed completely out (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

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

Alphabetic reference
The 4-cylinder
5-cylinder NG
6-cylinder ABC/AAH
The set size of pressure of compression, bar
Minimum size, bar
Maximum difference of pressure, bar