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
      Measurement of cylinders
      Check, assemblage and installation of shatunno-piston group
      Check of a cranked shaft
   + 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

Major repairs

Measurement of cylinders


For carrying out of measurements of cylinders it is necessary to take advantage special стрелочным of a measuring instrument with which help it is possible to make measurements in the top, average and bottom part of the cylinder. If стрелочного the measuring instrument is not present available, it is impossible to execute this operation.

1. Cylinder measurement should be made in directions And and d measurements should make on distance of 10 mm from an upper edge, 10 mm from a bottom edge and in an average part, i.e. at levels 1, 2 and 3. In total, it is necessary to make on six measurements on each cylinder. All measured sizes need to be written down and compared with resulted in Specifications.
2. It is necessary to mean that it is necessary to chisel all cylinders even if the sizes of one of cylinders are not in norm. A maximum deviation on 0.8 mm from nominal size. The repair sizes of pistons are specified in Specifications.
3. The definitive size of the cylinder is defined after measurement of diameter of the piston which is spent to 10 mm from a bottom edge of a skirt of the piston and in the right corner of an aperture of a piston finger.
4. Then by this size it is necessary to add size of a backlash of the piston of 0.03 mm. Besides, it is necessary to add 0.02 mm on хонингование the cylinder.
5. For check of a backlash of the piston it is necessary to measure the piston and the cylinder in the cylinder in the way described above, and to calculate a difference between these sizes. If the result exceeds 0.08 mm, it is necessary to chisel cylinders as the backlash has reached limiting size of deterioration.

On the main page