Audi A3

Since 1997 of release

Repair and car operation

Audi A3
+ The maintenance instruction
+ Current leaving and service
- The engine
   Compression check in engine cylinders
   Check of the engine by means of the vacuum gauge
   Removal and installation of the bottom cover of an impellent compartment
   Removal and engine/rkpp installation
   + Four-cylinder petrol engines 1.6, 1.8 l
   + Diesel engines
   + Major repairs
   + Greasing system
+ Systems of cooling, heating
+ The power supply system and release of the fulfilled gases
+ Engine electric equipment
+ Manual box of a gear change
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Electroschemes

Compression check in engine cylinders


The compression provides guidance on an engine condition. Results of check show, whether it is necessary to replace the engine on new or he demands a complete repair. For check carrying out it is required компрессометр.

The difference in pressure between separate cylinders should not exceed 3.0 bar. If one or several cylinders have the pressure different from pressure in other cylinders more, than upon 3.0 bar, it specifies in presence негерметичности a sealing lining of a head of cylinders, damage of valves, deterioration of piston rings or a working surface of cylinders. If a deterioration limit will reach, it is necessary to repair or replace the engine.

1. For check of a compression the temperature of impellent oil should be not less +30°С. Thus the oil filter has palm temperature. If temperature below specified, the engine is necessary for warming up. The engine temperature should not be too high, otherwise at a reversing of spark plugs the carving in a head of cylinders can be damaged.
2. Switch off ignition.
3. Remove all spark plugs.
4. Take out a safety lock of the fuel pump.
5. Engines of 1.6 l: Расстыкуйте a socket of injectors at both external cylinders.
6. Engines 1.6: Расстыкуйте a socket of a target step of ignition. The target step is included between a monitor and ignition coils.
7. Turn the engine a starter to throw out a deposit and soot.


Establish РКПП in neutral position and tighten a lay brake.
At проворачивании the engine be not declined over it. There is a danger травмирования as a result of soot emission.

8. Screw or press компрессометр in one of apertures under a spark plug.
9. Ask the assistant to press a pedal of gas and to keep it in such position during all check.
10. Turn the engine approximately on 8 turns so that the measuring device did not show more pressure jumps.
11. Check up one after another all cylinders and compare the received values to demanded value.
12. Upon termination of work establish to the place of a spark plug.
13. Join again a socket of a target step (engines 1.6).
14. Engines of 1.6 l: Join штекерные connections at external injectors.


Owing to undocking штекерных connections in a monitor the engine malfunctions can register. It is recommended, as soon as possible to remove them on HUNDRED AUDI.

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