BMW 3 series E30

Since 1983-1994 of release

Repair and car operation

+ 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?

14.26. That it is necessary to know at purchase of the air filter

Now our motorist faces to a problem – it is necessary to choose. And to choose too it is uneasy, after all the market of automobile filters is great. The filter is not the engine and not коленвал what difference who has made it also what it designs if only the functions carried out, yes cheaply cost.

From time to time there are novelties in which new designs and materials are used, but happens that they at all have no quality certificate.

The trouble consists that an unsuccessful choice such малости as, for example, the air filter to which and the price of 5 dollars, can ruin the engine, and here already expenses are measured not by units, and thousand dollars.

Appointment of the air filter as clearly all: to block access of a dust and to dust in a working cavity of the cylinder. Hit there small particles causes intensive deterioration, and as consequence – increase in backlashes between the piston and a cylinder wall.

Let's consider a design of the usual air filter.

The FILTERING CURTAIN is a basic working part of any filter, but the filter will not carry out the functions if it will not be dense, without backlashes to become in the case.

The INTERNAL GRID – it is necessary only in the event that sealing trailer disks are executed from not elastic rigid material as is that element which helps to keep a surface прилегания a sealing ring enough the equal. But if on case covers there are dents the grid will disturb only, holding rigidity of a design and interfering with that the sealant has filled these backlashes and has prevented receipt of crude air.

TRAILER SEALING DISKS – their appointment, first of all, to promote absolute consolidation at a filter clip in the case, not to admit that the dirt has passed by a filtering curtain. If the material of which sealing trailer disks are made, is elastic, also the grid in the filter is not necessary – rigidity of a design is reached by means of edges of rigidity of the goffered filtering curtain. The elastic sealant without hindrances blocks all cracks and roughnesses on case surfaces.

The inquiry

The basic defects which are supposed at manufacturing of air filters, leaders to premature failure of the engine:

 – Use of a poor-quality filtering paper;
 – The small area of a filtering curtain (leads to a premature contamination and, as consequence, capacity falls and the fuel expense raises);
 – Incorrectly picked up material of sealing disks (insufficiently elastic, fragile at low temperatures);
 – A wrong profile of sealing disks (leads to impossibility dense прилегания to the case).

Usually the automobile owner does not penetrate into subtleties of a design of the filter and in own way chooses the filter approaching for it.

Researches have shown that at a choice of the filter of buyers interest:

 – Reliability of a filtration;
 – The reasonable price;
 – A trade dress;
 – The known trade mark.