Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation

Audi 80/Avant
+ The description
- Engines
   Basic elements
   Greasing system
   Ventilation картера
   Visual check of the engine
   Обкатка the new engine
   Engine service life
   Nominal and maximum frequency of rotation
   Restriction of frequency of rotation
   Measurement of pressure of compression
   The list of malfunctions
   Проворачивание the engine
   Hydraulic pushers
   Works on gear belt ГРМ
   The list of malfunctions
   Removal and installation of a head of the block of cylinders
   Removal and engine installation
+ System of release of the fulfilled gases
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and воздухозаборные channels
+ Injection system
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Antiblocking system of brakes
+ Wheels and tyres
+ Kuzovnaja electrosystem
+ Ignition system
+ Illumination
+ 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. For house application more simple control devices with the index, besides, they more low in the price will approach.

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


    A few to be passed, that the engine has reached working temperature. Piston rings condense better, if oil warm. To disconnect ignition and fuel receipt. It becomes in different models differently: The 4-cylinder engine: to separate the tip on the electronic switchboard of the coil of ignition. To separate the multicontact tip on the central injection (the engine capacity of 66 kw) or tips of all of four впрысковых atomizers (the engine capacity of 85 kw). The 5-cylinder engine: to separate the tip on the electronic switchboard of the coil of ignition. To take out a safety lock № 17 in the block of safety locks. The 6-cylinder engine: to separate both tips on the electronic switchboard of coils of ignition. To separate tips of all of six впрысковых atomizers. In addition to separate holders of high-voltage wires топливопровода the third and fourth cylinders. All models: to unscrew all spark plugs. To press a rubber cone of the device for pressure measurement to a candle aperture 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. To put the car on a lay brake, to establish the handle of a gear change of a mechanical transmission in neutral position, and the handle of an automatic transmission accordingly in position Р. To ask the assistant to turn the engine a starter. The accelerator pedal should be completely squeezed out thus (for the best filling of cylinders). When the pressure indicator has ceased to increase, write down it and to pass to the following cylinder.

Pressure indicators

In the table indicators of pressure the compression specified Audi are resulted:

 The engine
Letter designation
5-cylinder NG
6-cylinder ABC/AAH
The set size of pressure of compression, bar
9 – 12
11 – 16
10 – 14
11 – 16
The minimum size, bar
The maximum difference of pressure, bar