Audi A3

since 1997 of release

Repair and car operation

Audi A3
+ Maintenance instruction
+ Current leaving and service
- Engine
   Compression check in engine cylinders
   Engine check by means of the vacuum gage
   Removal and installation of the bottom cover of an impellent compartment
   Removal and engine/RKPP installation
   + Four-cylinder petrol engines 1.6, 1.8 of l
   + Diesel engines
   - Major maintenance
      Measurement of cylinders
      Check, assembly and installation of shatunno-piston group
      Check of a cranked shaft
   + greasing System
+ Systems of cooling, heating
+ the Power supply system and production of the fulfilled gases
+ engine Electric equipment
+ Manual box of gear shifting
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Elektroskhema

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Major maintenance

Measurement of cylinders


For carrying out measurements of cylinders it is necessary to use a special strelochny measuring instrument by means of which it is possible to make measurements in the top, average and lower part of the cylinder. If the strelochny measuring instrument is not present available, it is impossible to execute this operation.

1. Measurement of the cylinder should be made in the directions A and Century Besides, measurements should be made at distance of 10 mm from the upper edge, 10 mm from 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 given 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 tolerance on 0.8 mm from nominal size. The repair sizes of pistons are specified in Specifications.
3. The final size of the cylinder is defined after measurement of diameter of the piston which is led to 10 mm from bottom edge of a skirt of the piston and in the right corner of an opening of a piston finger.
4. Then by this size it is necessary to add size of a gap of the piston of 0.03 mm. Besides, it is necessary to add 0.02 mm on a cylinder honingovaniye.
5. For check of a gap 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 gap reached limiting size of wear.