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Mercedes S-class W2021993-2000 of releaseRepair and car operation |
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Mercedes W202 + 1.2. The general data + 2. Maintenance service + 3. Engines + 4. Greasing system + 5. Cooling system + 6. Heating, ventilation + 7. Ignition system + 8. Fuel system + 9. Transmission + 10. A running gear + 11. A steering + 12. Brake system - 13. A body 13.2. A forward door 13.3. A back door 13.4. The handle of a forward door 13.5. The handle of a back door 13.6. A door-lock 13.7. An internal covering of doors 13.8. Forward стеклоподъемник 13.9. Glass of a forward window 13.10. Back стеклоподъемник 13.11. Glass of a forward door 13.12. The engine стеклоподъемника 13.13. Perchatochnyj boxing 13.14. A sheeting of the handle of a gear change 13.15. A forward ashtray 13.16. The average console 13.17. The panel of service of heating 13.18. An internal covering of the A-rack 13.19. An internal covering of the S-rack 13.20. A forward seat 13.21. A back seat + 13.22. The central lock 13.23. The external mirror / has flown down mirrors 13.24. A covering under the instrument panel 13.25. A forward bumper 13.26. A back bumper 13.27. An internal wing of the car 13.28. A car wing 13.29. A lattice of a radiator / emblem Mercedes 13.30. Draught of a cowl of the engine 13.31. A covering under a windscreen 13.32. The device of giving of air for salon heating 13.33. A catchment basin 13.34. A paint and varnish covering 13.35. Metal corrosion 13.36. An automake-up 13.37. What creaks? 13.38. The hatch + 14. An electric equipment + 14.2. Electroschemes |
13.35. 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. 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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