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BMW 3 series E30Since 1983-1994 of releaseRepair and car operation |
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BMW E30 + 1. The maintenance instruction + 2. Maintenance service + 3. The engine + 4. Cooling system + 5. Heating and ventilation + 6. Fuel system + 7. An exhaust system + 8. Transmissions + 9. Coupling + 10. Brake system + 11. A running gear + 12. A body + 13. An electric equipment - 14. A good advice 14.2. Changed numbers 14.3. Purchase of the old car or a 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. A rule 35 14.8. A choice of the second-hand car 14.9. Engine oils 14.10. That it is necessary to know, changing oil 14.11. Occurrence in deposit oil 14.12. Whether it is possible to mix import oils? 14.13. "Eats" much, but silently goes 14.14. It is more likely live, than it is dead … 14.15. It is not got - a good advice 14.16. Visit to car-care centre 14.17. A gear belt for a mechanism drive газораспределения 14.18. Deterioration 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 has failed 14.23. The 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 at purchase of the air filter 14.27. An engine overheat 14.28. That it is necessary to know to the owner of the car with инжекторным the engine 14.29. The 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. The catalyst 14.34. Three in one - or how to save the catalyst 14.35. Пробуксовочка 14.36. Features of operation of brake system 14.37. Malfunctions of brake system 14.38. Brake liquids 14.39. АБС: a natural choice 14.40. Wheel disks 14.41. We update wheel disks 14.42. The scheme of marks of an automobile tyre 14.43. Metal corrosion 14.44. An automake-up 14.45. What creaks? 14.46. The hatch 14.47. A safety pillow: troubles or pleasures? 14.48. We fit well? 14.49. Anticreeping "immunodeficiency" 14.50. Why headlights grow dull 14.51. "Галогенки" 14.52. About correct adjustment of headlights 14.53. The electric motor 14.54. From change of places "composed" varies nothing? |
14.43. Metal corrosion
Approximately 70 % of cost of the car are defined by a body condition. And it, in turn, depends on, whether the car has visited failure and, the main thing, from degree of its corrosion damages. The reasons causing accelerated corrosion, are subdivided on two groups and connected: – With constructive or technological features of concrete models; It is possible to carry to the first group: – Occurrence of high pressure and vibrations of metal of a body; External influences concern: – Sulphurous connections, dioxide of carbon and the chlorides containing in environment; Under our conditions the greatest influence is rendered by various salt solutions as lead to formation of current-carrying "bridges" between body details, as a rule, having different electric potential. It causes most быстротекуший a kind of destruction of metal – electrochemical corrosion. An essence that all cars have the single-wire electroscheme, and, hence, on a body currents from one consumer to another "walk". Let's not go deep further into the theory, having left its experts in the field of corrosion, and it is reversible to practical questions. These results are based on use during examination of three types of the devices, allowing to estimate: – Change of a thickness of "live" metal, that is not подвергшегося to corrosion influence; Results of examinations which are spent by experts, allow to draw following conclusions: 1. In the conditions of our region speed of penetration of corrosion in metal for cars with winter operation makes – 0,2 mm year and 0,1 mm in a year for the cars which were not seeing salts. 2. Corrosion in the zones which were exposed кузовному to repair, and absolutely quickly if this repair was made with use of welding or the soldering as electrochemical steams from diverse metals are created especially quickly develops. For buying the car, in particular a foreign car, it is essentially important. After all knowingly economical Europeans practically always sell even slightly beaten car (the truth, having received the insurance) for nothing – $1-2 thousand. For how many them then перепродают in our markets, the reader, probably, knows also itself. But if to you has had the luck to find out a latent defect before purchase fulfilment, know that real cost of such motor vehicle on 25–50 % more low, than at the unbeaten. It is impossible to forget that sooner or later you will sell the car, and without experts expensive purchases are done now only by very naive people. 3. Most quickly there is a corrosion process in the cars maintained in the winter and stored in garages, especially warm, without preliminary dissolution of salts by flowing water. We underline, not washings off, namely dissolution. Those who believe very are mistaken that, washing away a strong stream the bottom part of the car, they do a good deed. Salts are easily dissolved and without a strong pressure, and here sheetings from a powerful stream quickly enough "come unstuck" from metal, sag, creating only protection illusion. In formed between metal and the sagged mastic cavities corrosion develops much faster, than on open metal. The inquiry Extremely it is not recommended to wash the car with hot water as because of different temperature expansion sheetings getting warm first of all "slip" from metal, forming a negative effect. Those who believes are not right that the a sheeting more thickly, the better. All very much the other way. The main thing that in a covering there were no ruptures that is why it is necessary for updating regularly. In summary – a practical advice. From two cars what is younger"is better not, and on what process of destruction of metal has not got on depth more than 0,4-0,5 mm. In this case any processing it is impossible to prevent formation of holes in one and a half-two year. And on the contrary, even the old car possessing from the beginning of operation by reliable protection, will serve as early as more many years. Under our conditions in a foreign car it is possible to repair the engine and a running gear, but is economically inexpedient to repair strongly rotted through body. |
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