Audi A4

since 1994 of release

Repair and car operation



A4 Audi
+ Running gear
+ Regular servicing
- Engines
   Capacity steps
   Engine signs
   Technology of the engine, maintenance and repair
   Greasing system
   Exhaust ventilation of a case
   Visual control of the engine
   Engine service life
   Nominal and maximum frequency of turns
   Restriction of number of turns
   Measurement of pressure of compression
   The help at malfunctions
   Hydropushers
   Works on a gear belt
   The help at malfunction
   Installation and dismantle of a head of the block of cylinders
   Installation and engine dismantle
+ Turbo-supercharging
+ exhaust System
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and absorption channels
+ injection System
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ ignition System
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics





Works on a gear belt

Gear belt on the 6-cylinder engine will pull correctly if it it is possible to turn fingers a boundary a gear wheel of a drive of a gear belt and the top directing roller no more than on 90о.


In the engine with working volume of 1,8 l the top cover of a gear belt too fastens clips (2 and 3). At installation ledges (1) below on a cover should be correctly inserted into the lower part of a cover.


Big efforts are demanded by work on dismantle of the bottom cover of a gear belt in the engine with working volume of 1,8 l. Figures (1–4) designated an arrangement of fixing bolts.


Here both pistons (1 and 2) the mechanism of a tension of a gear belt in four-cylinder engines are shown.

At the left: a tension roller of a gear belt at the four-cylinder engine. By figures are designated:

1–a wrench with two openings for installation of a tension of a gear belt (the text above);
2–fixing bolt.

On the right: the tension roller at the six-cylinder engine is in quite hidden place on the right ahead on the motor block. The arrow showed tightening a bolt.

On the dismantled engine with working volume of 1,8 l the arrangement of some knots is visible

1–belt pulley of the crankshaft;
2–tension roller of a gear belt;
3–pulley of a gear belt of a cam-shaft;
4–Hall sensor;

5–gear belt;
6–the device for a tension of a poliklinovy belt;
7–bearing of the fan of a radiator;
8–pulley of a maple belt of the water pump.

At the left: the engine with working volume of 1,8 l. The mark of VMT (2) in a pulley of a gear belt of a cam-shaft and a mark (1) corresponding to it in a cover of a head of the block of cylinders should be opposite to each other the same as a mark of VMT (4) in a belt pulley of the crankshaft and an arrow (3) corresponding to it in the bottom cover of a gear belt.

On the right: at the engine with working volume of 1,6 l the mark in a pulley (2) gear belts of a cam-shaft should correspond to a mark in the form of an arrow (1) on a back cover of a gear belt. Crankshaft VMT in the same situation, as in the engine with working volume of 1,8 l.

As the silent driving element located (ых) from above of a cam-shaft (ов), the gear belt, being actuated serves as the crankshaft.

The gear rubber belt with the loose leaf from a steel wire works without wear, thus the rubber mix of a gear belt provides dry greasing of belt pulleys. The gear belt except a cam-shaft serves in the 6-cylinder engine as a drive of the water pump. In the 4-cylinder engine the belt in addition puts in action an intermediate shaft which in turn serves as a drive of the oil pump and the ignition distributor (only in 1,6 l the engine).

 Council: For work on a gear belt the car with the four-cylinder engine should be brought into so-called service situation (head of the Detail of a body). Thus the face-to-face part acts in film from the car and is taken away on some distance by means of bolts. For the purpose of access improvement we recommend to you to dismantle also a gear belt in the 6-cylinder engine.

Dismantle of a cover of a gear belt

 PERFORMANCE ORDER

  1. Four-cylinder engine: dismantle an airintaking hose, having unscrewed two screws with crosswise heads on a face-to-face part of the car.
  2. Wring out above on a cover two fixing collars.
  3. Remove up the top part of a cover.
  4. At installation track that the cover was correctly inserted by bottom edge into an opposite detail, otherwise it will not be reliably fixed.
  5. In most cases it is enough to dismantle the top part of a cover. To dismantle also lower part of a cover, more difficult.
  6. Bring a face-to-face part of the car into service situation (head of the Detail of a body).
  7. Dismantle the vyazkostny fan (head cooling System).
  8. Remove a klinovo-ridge belt and unscrew the mechanism of a tension of a belt.
  9. Unscrew a pulley of a klinovo-ridge belt at the crankshaft and a pulley of a klinovo-ridge belt of the water pump.
  10. Weaken fixing bolts or nuts of the bottom cover of a gear belt and remove it.
  11. At installation bolts are tightened as follows: a pulley of a klinovo-ridge belt at the crankshaft with the moment of an inhaling of 25 Nanometers (watch fixing), pulleys of a klinovo-ridge belt at the water pump on 20 Nanometers, nuts or bolts of a cover of a gear belt on 10 Nanometers.
  12. 6-cylinder engine: dismantle the vyazkostny fan.
  13. Dismantle a klinovo-ridge belt with a tension roller of a klinovo-ridge belt.
  14. Weaken from above and from below on each half of a cover of a gear belt on one coupling collar.
  15. Carefully take out a cover from other hooks.

Check of a condition of a gear belt

 PERFORMANCE ORDER

  1. Uncover a gear belt.
  2. The gear belt should not be greasy or cracked.
  3. Lateral faces of a teeth should be serviceable and not carry wear tracks.
  4. In order that you could examine a belt on all length, turn a cranked shaft how it is described in head further.
  5. Surely replace the damaged gear belt.

Check of a tension of a gear belt

The four-cylinder engine has a spring roller for a tension of a gear belt which automatically creates the necessary tension of a belt. In this regard the mechanism of a tension of a belt is checked only. The six-cylinder engine has a static tension of a belt.

 PERFORMANCE ORDER

  1. Four-cylinder engine: remove the top cover of a gear belt.
  2. Press a belt between pulleys and observe a spring tension roller: the tension roller should be wrung out thus and at a belt otpuskaniye again to return to a starting position. In this case mechanism of a tension of a belt as it should be.
  3. Check by means of a mirror, in what range of a scale there is an edge of the piston.
  4. Range "And": everything is all right.
  5. Range "In": normal area of wear; adjustment can remain.
  6. Range "With": mechanism adjustment (see the following section) is necessary or there is a defect in a gear belt or in a tension roller.
  7. Six-cylinder engine: uncover a gear belt.
  8. Carry out measurement between a pulley of a cam-shaft and the top by-pass roller on the right side of cylinders if to look in the direction of travel.
  9. The cold gear belt at the correct tension should turn on 90 ° (= to a right angle) only big and index fingers.

Installation of a tension of a gear belt

4-cylinder engine

Installation is made at the cold and heated-up engine by a wrench with two openings, for example Hazet 2587.

 PERFORMANCE ORDER

  1. Remove the top cover of a gear belt, weaken a fixing bolt.
  2. The device of a tension of a gear belt turn a wrench so that the piston "1" was completely put forward and the piston "2" raised the tension device approximately on 1 mm.
  3. Tighten in the beginning a hand a fixing bolt of a tension roller.
  4. Turn a cranked shaft on two turns in the movement direction (to the right).
  5. Check, whether the range "And" on a scale opposite to the upper edge of the piston "2" settles down.
  6. If it cannot be made because of bad access, it is possible to measure «D» = 25–29 mm.
  7. If installation yet does not correspond to norm, pull also for check again turn a cranked shaft.
  8. At the correct installation tighten a fixing bolt of a tension roller with the moment of an inhaling of 25 Nanometers.
  9. Turn on one turn the crankshaft and once again check a tension of a gear belt.

Installation of a tension of a gear belt

6-cylinder engine

 PERFORMANCE ORDER

  1. In the beginning uncover a gear belt.
  2. Dismantle a klinovo-ridge belt and the device of its tension.
  3. Weaken tightening a bolt (with internal shestigranniky 8 mm) on a tension roller.
  4. Turn a natural internal shestigranniky 8 mm a tension roller to the right down to that time while the tension of a belt does not become correct.
  5. Keep a tension roller in this situation.
  6. Natural internal shestigranniky 8 mm tighten tightening a bolt of a tension roller (45 Nanometers).
  7. Turn on one turn the crankshaft and once again check a tension of a gear belt.

Replacement of a gear belt, installation of phases of a gazoraspredeleniye

The description of process of replacement of a gear belt belongs not only directly to this work, but also to dismantle and installation of a head of the block of cylinders, thus the gear belt inevitably should act in film.

Installation of a gear belt according to the logic of things assumes also installation of phases of a gazoraspredeleniye. But to avoid error, it is necessary to remember that phases of a gazoraspredeleniye do not change as a result of wear. Installation is made only once if before it the gear belt acted in film.

 Council: Only at the correct installation of phases of a gazoraspredeleniye coordinated operation of valves and the gas-distributing mechanism is provided. Incorrectly established phases of a gazoraspredeleniye are at the bottom of low engine capacity and as a last resort can even lead to the heaviest damages of the engine when the basis of the piston beats on out of time closed valves. Installation in different types of engines is made differently.

Audi any more does not provide replacement of a gear belt within regular maintenance of the car. Nevertheless all of us would replace a belt after 150 000 km of run. If the gear belt tears, the new engine will be necessary. In comparison with it preventive replacement of a gear belt costs kopeks.

Whether it is possible to make it by own efforts?

Replacement of a gear belt puts different problems depending on engine model:

  • At the four-cylinder engine replacement of a gear belt represents as a whole a laborious work, but professionally not a component of too bigger problem. Thus special tools are not necessary.
  • At the six-cylinder engine for installation of phases of a gazoraspredeleniye (that becomes necessary after dismantle of a gear belt and a head of the block of cylinders) it is necessary to fix absolutely precisely cam-shafts and the crankshaft in situation VMT by means of special tools (tools 3242 and 3243). You should get the mentioned tools.

Replacement of a gear belt

4-cylinder engine

 PERFORMANCE ORDER

  1. Bring the face-to-face often car into service situation (head of the Detail of a body).
  2. Dismantle the vyazkostny fan.
  3. Remove maple and klinovo-ridge belts, unscrew the device of a tension of a belt (section Generator).
  4. Dismantle a pulley of a klinovo-ridge belt at the crankshaft after weakening of a bolt with an internal shestigrannik (not the central bolt).
  5. Unscrew a pulley of a maple belt of the water pump.
  6. Dismantle the top part of a cover of a gear belt.
  7. Weaken fixing bolts and nuts of the bottom cover of a gear belt and remove it.
  8. Put the piston in the cylinder 1 in the provision of ignition in VMT, see above in this chapter.
  9. Designate the movement direction on a gear belt for the subsequent installation. Keep the same direction of movement of the belt which was in the use.
  10. Weaken fixing bolts of a tension roller and remove a gear belt.
  11. Impose a new gear belt. If the provision of a pulley of the crankshaft and a cam-shaft did not change, phases of a gazoraspredeleniye of valves are still established correctly. Safety for the sake of nevertheless them need to be checked before final assembly:
  12. Pulley of a gear belt of a cam-shaft turn so that marking of a pulley rose under an arrow on a back cover of a gear belt (the engine with working volume of 1,6 l) or under a mark in a cover of a head of the block of cylinders (the engine with working volume of 1,8 l).
  13. If now it is necessary to turn a cam-shaft, it can be made only when the piston is in situation VMT, otherwise it is possible to damage valves or the bases of pistons.
  14. The mark of VMT of the crankshaft is checked through a viewing opening on a transmission.
  15. At the engine with working volume of 1,6 l check also the provision of an intermediate shaft. For this purpose uncover the distributor of ignition and check, whether points a distributor finger to a label in edge of its case. If is not present, turn an intermediate shaft so that labels coincided.
  16. Impose a gear belt, thus watch that the provision of various pulleys did not change.
  17. Pull a gear belt how it is described above.
  18. For all models: a cranked shaft completely turn two times and still check installation.
  19. Screw the bottom cover of a gear belt with the moment of an inhaling of 10 Nanometers.
  20. Fix a pulley of a poliklinovy belt of a cam-shaft with the moment of an inhaling of 25 Nanometers. Thus track the correct provision of a cover: depending on model of the engine or the fixing pin should enter into a belt pulley, or fixing openings of a belt pulley are located asymmetrically. In this case all fixing openings should coincide with openings on the crankshaft.
  21. Other assembly is made, respectively, as it should be, the return to dismantle.
  22. The engine with working volume of 1,6 l: adjust ignition.

Replacement of a gear belt

Six-cylinder engine

 PERFORMANCE ORDER

  1. Dismantle poliklinovy a belt together with the tension device (section Generator).
  2. Dismantle covers of a gear belt on both parties.
  3. Turn the crankshaft in the provision of ignition in cylinder 1 VMT. Marks in a belt pulley of the crankshaft and a cover of a gear belt should coincide, big openings on fixing plates on pulleys of cam-shafts should be turned to each other to the engine center.
  4. Unscrew from a case the sensor of the moment of ignition and instead of it screw in the special
    tool «Crankshaft 3242 fastening». Slightly tighten.
  5. Dismantle a pulley of a poliklinovy belt of the crankshaft, unscrew the bottom cover of a gear belt.
  6. Note the direction of movement of a gear belt for the subsequent installation. Keep the same direction of movement of the belt which was in the use.
  7. Weaken a tension roller of a gear belt, remove a gear belt.
  8. Installation: the special tool «Fastening of a cam-shaft 3243» establish on fixing plates of cam-shafts.
  9. Weaken bolts of pulleys of cam-shafts approximately only on three turns.
  10. Again dismantle the special tool 3243.
  11. Remove both pulleys of a cam-shaft from a cone. Use for this purpose nippers. Establish прихваты on a reverse side of a nave of a pulley of a gear belt; the bolt remains, as was (weakened on three turns).
  12. After completion of preliminary works installation now begins:
  13. For carrying out further work now it is necessary to impose a new gear belt. When imposing the belt which was in the use, consider the direction of its movement.
  14. Again establish on fixing plates of cam-shafts the special tool «Fastening of a cam-shaft 3243».
  15. Once again check correctness of installation of the special tool.
  16. Pulleys of cam-shafts should be put on a cone so that they rotated on a shaft, but were not shaken (a bolt is screwed up manually).
  17. Now pull a gear belt (see in head above).
  18. Tighten pulleys of cam-shafts with the inhaling moment on 30 Nanometers and then finally tighten bolts on 1/2 turns (180 °).
  19. Remove the special tool.
  20. Mount again dismantled details.

At the left: in drawing installation of the special tool 3243 for fixing of cam-shafts in situation VMT is shown at the six-cylinder engine.

On the right: here the tool 3242 and a place in which it is screwed in in the block of cylinders for fixing of a cranked shaft is shown.


To establish the special tool 3243, it is necessary to unscrew from a case (1) sensor of the moment of ignition (2) six-cylinder engines.


Removal of a pulley of a gear belt of a cam-shaft by means of a stripper at the weakened fixing bolt.