E30 series BMW 3

since 1983-1994 of release

Repair and car operation

+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engine
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
+ 7. Exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
- 14. Good advice
   14.2. Changed numbers
   14.3. Purchase of the old car or mysterious set of figures and letters
   14.4. Durability of the car
   14.5. About parallelism of bridges of the car and the trailer
   14.6. Preparation of the car for winter
   14.7. Rule 35
   14.8. Choice of the second-hand car
   14.9. Engine oils
   14.10. That it is necessary to know, changing oil
   14.11. Emergence in deposit oil
   14.12 whether. It is possible to mix import oils?
   14.13. "Eats" much, but silently goes
   14.14. It is rather live, than it is dead …
   14.15. It is not got - good advice
   14.16. Visit to car-care center
   14.17. A gear belt for a drive of the mechanism of a gazoraspredeleniye
   14.18. Wear of pistons
   14.19. Valves
   14.20. Bearings of engines
   14.21. Engine pollution
   14.22. As the conditioner works and what to do, if it failed
   14.23. Conditioner: not only "pluses", but also "minuses"
   14.24. Rules of service of the conditioner
   14.25. It is not necessary to stir antifreeze with antifreeze …
   14.26. That it is necessary to know upon purchase of the air filter
   14.27. Engine overheat
   14.28. That it is necessary to know to the owner of the car with the injector engine
   14.29. Accumulator
   14.30. Possible malfunctions of the storage battery
   14.31. What to do with the failed generator
   14.32. The belt is guilty, and we blame the generator
   14.33. Catalyst
   14.34. Rub in one - or how to save the catalyst
   14.35. Probuksovochka
   14.36. Features of operation of brake system
   14.37. Malfunctions of brake system
   14.38. Brake liquids
   14.39. ABS: natural choice
   14.40. Rims
   14.41. We update rims
   14.42. Scheme of marking of a car tire
   14.43. Metal corrosion
   14.44. Automake-up
   14.45. What creaks?
   14.46. Hatch
   14.47. Safety cushion: troubles or pleasures?
   14.48. We fit well?
   14.49. Anticreeping "immunodeficiency"
   14.50. Why headlights grow dull
   14.51. "Galogenki"
   14.52. About the correct adjustment of headlights
   14.53. Electric motor
   14.54. From change of places "composed" changes nothing?


14.32. The belt is guilty, and we blame the generator


Sooner or later each motorist should replace an old belt with the new. And as a rule, here any special questions does not arise, if it is required to replace a belt of a drive of the generator – there would be it near at hand the necessary minute. More often on a drive of generating installation the belt having a maple form of cross-section section is used and it settles down in the corresponding flute of pulleys. It can be made with a teeth or without them. In transfer happens one or several belts. In many respects it depends on the transferred capacity on a drive of the generator, oil and water pumps and other consumers of energy. Some thin belts apply instead of one thick by transfer of big effort, high speed at small diameters of the leader and conducted pulleys for the purpose of reduction of tension of a bend in a material. At the expense of it the durability of a belt increases.

It should be noted advantage of a belt drive – smoothness and noiselessness of work. She does not demand additional service, for example, greasings, protects knots from an overload at the expense of a proskalzyvaniye.

Working surface are lateral sides, and the effort is transferred at the expense of a considerable friction (jamming) of a belt in a pulley flute. Therefore, if you see that the belt works with the bottom surface, it is necessary to replace it – it will fail soon.

The weak tension of a belt leads to a probuksovyvaniye under loading. It becomes frequent the reason of bad work of generating installation. The belt is guilty, and we blame the generator. Thus more often when towing a belt are audible "взвизги". Operation of the water pump that can lead to an engine overheat worsens. But the last happens much less often.

The excessive, strong tension of a belt leads to its fast wear process, increases effort to bearings of a shaft of the water pump and the forward bearing of the generator.


The increase in 2 times of load of the bearing reduces term of its service in 8 times. Therefore the excessive effort should not be applied.

The normal tension is characterized by a certain deflection about 8-10 mm when pressing by a finger with effort of 3-4 kg to the site middle between a water pomp and the generator.

The tension of a belt is regulated more often by generator shift. For this purpose weaken a nut and bolts of fastening of the generator to a tension level and pull a belt by means of the lever. A hand to execute it it is difficult.

If at you during movement the generator belt (he often gives also a water pomp) became torn, it will be appreciable by the sensor of temperature of cooling liquid – the temperature raises, and on the ampermeter – will show the battery category (the arrow will deviate aside "minus"). For such a case we advise to carry with themselves spare, and it is better not to lead up to this condition: sometimes at break pieces of a belt get between a radiator and the fan that leads to destruction of tubes of cooling.

In modern cars are applied not only maple belts, but also gear which are used in synchronous transfers on drives of the fuel pump of a high pressure (TNVD) and the gas-distributing mechanism (GRM).

For the correct installation of gear belts in these transfers combination of the corresponding labels on gear pulleys of cranked and distributive shaft with the corresponding labels on a belt and labels on covers is necessary.

As break of a gear belt in operating time of the engine leads, as a rule, to considerable breakages of GRM and krivoshipno-piston group, it is necessary to replace them according to manufacturer recommendations (approximately through 80 thousand km).

If to consider chain transfer for a drive of the gas-distributing mechanism, there are more than shortcomings than advantages.

Advantages: the increased durability of a steel chain in comparison with a belt that gives the chance transfers of bigger capacity. Whether but such big the capacity on GRM drive is required? Certainly, no.

There is a lot of shortcomings: wear of hinges of a chain, additional loadings, need of greasing, wear of asterisks. But the main shortcoming – the increased noise level.