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

Check of a cranked shaft

1. Carefully check up a cranked shaft on presence of damages and make exact measurements of necks radical and шатунных bearings. Necks of radical bearings and шатунные necks can be chiseled to three times so it is possible to establish a shaft with loose leaves of bearings of the repair (smaller) size. Diameter шатунных necks is identical to all types of engines.
2. Clamp a cranked shaft centre to centre a lathe (or put necks of bearings in prisms) and with the help стрелочного the indicator measure palpation on an average neck. Palpation should not exceed size of 0.06 mm. Otherwise it is necessary to replace a shaft.
3. Measure backlashes in radical and шатунных bearings.
4. Well clear loose leaves of bearings and put them in beds of bearings of the block of cylinders or in rods.
5. Put on a material slice “Plastigage” (plastic "wire") on a neck of each radical bearing and on a cover of each radical bearing with the enclosed loose leaves. Tighten bolts the moment of an inhaling of 65 Nanometers. A shaft after that do not turn.
6. For check of backlashes шатунных bearings it is necessary to put a rod to шатунной to a neck and put a slice “Plastigage” on the top part шатунной necks (arrow). Put a cover of the bearing with the loose leaf and tighten nuts the moment of an inhaling of 30 Nanometers. As the shaft cannot be turned more, measurements are spent on two шатунных the bearings which are in НМТ.
7. Turn away a cover on radical bearings, on шатунных bearings turn on both covers by turns.
8. By means of the measuring ruler entering into the complete set “Plastigage” measure the crushed strips of a material in the widest place. If this size exceeds 0.17 mm for radical bearings, it is necessary to replace covers of bearings new, and it is necessary to mean, whether necks earlier were ground.
9. For check of backlashes of other bearings it is necessary to check up a cranked shaft and to make measurements on two others шатунных bearings. If there is no set “Plastigage”, but you can take advantage стрелочным нутромером, it is possible to make measurements of backlashes radical and шатунных bearings in the described below way.
10. Establish covers of bearings with the enclosed loose leaves according to numbers of bearings on the block of cylinders and tighten bolts the moment of an inhaling of 65 Nanometers. It is necessary to pay attention to that loose leaves have got on the former places by all means. If backlashes шатунных bearings are measured, it is necessary to enclose loose leaves in rods and in covers and to tighten covers former nuts, having tightened their moment of 30 Nanometers.
11. Measure internal diameters of bearings. Thus it is necessary to observe a direction of measurements And and In and places of measurements 1 and 2. Thus it is possible to define a deviation from a circle (And and) and size конусности (1 and 2). Write down the received results for each bearing.
12. Measure one after another diameters of all necks of bearings by means of a micrometer. Thus besides make measurements in certain places which are designated by arrows. Write down results of measurements for all necks of bearings.
13. Subtract results of measurements for diameters of bearings from results of measurements for internal diameters. The result will represent a backlash in the bearing (radical or шатунном) and should correspond to the size specified in Specifications.

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