E30 series BMW 3

since 1983-1994 of release

Repair and car operation



E30 BMW
+ 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?



14.19. Valves

GENERAL INFORMATION

Practical advice for professionals

It is possible to reanimate any "tired" car. But technical difficulties are thus great. Without the spare parts, any stanochny park, welding and other technological support here not to manage. The main thing – factory instructions on repair (they are available now) speak nothing about possible alternative decisions, especially about choice problems among details, materials and tools which are in the today's domestic market. Such is a circle of questions which both the loner enthusiast, and mechanics of "small service" lack information. We also want in process of possibilities to fill it.

Sooner or later any engine becomes a source of troubles: глохнет in a way, it does not want to be started in the mornings, pulls worse, "eats" superfluous fuel and oil. It is quite probable that the reason of his whimsical behavior is plain: to clean the carburetor enough, to adjust ignition and to replace maslosjemny caps that everything entered into norm. But happens that traditional approaches do not help it, and at measurements of a compression it becomes clear that in one or several cylinders it is lower admissible, – and the question becomes serious.

Then first of all specify nature of malfunction: wear of tsilindro-piston group, a podgoraniye of facets of valves or wear of cores and directing plugs. The equipment of diagnosing is rather simple and described in all grants on repair of engines.

Then decide on repair. Here only it is necessary to take itself for a rule: from any miracle liquids to be far away. The effect in principle is possible, but the usual result – superfluous expenses and efforts is reached seldom. It is better to be guided by high-grade repair procedure at once.

To find a workshop where treat engines, today it is not so difficult, and not only in the large cities. But here is how there work, what its quality is organized? Life shows that at all importance of experience and qualification of employees good results without the special equipment and equipment are unattainable, and in this plan the disorder of technical armament of our stations and mechanics is alas great. And if told concerned generally the motorist-ekspluatatsionnika above, the further statement is addressed not so much to it, how many to the mechanic, after all it will be a question of technology.

In cases when results of diagnostic check indicate malfunction of the klapanny mechanism, the head of the block should be removed. The first action after dismantle, dismantling and the general survey – an assessment of gaps between cores of valves and their directing plugs. If they are higher than maximum permissible values, valves replace with the new. But when this vague measure is insufficient, it is necessary to replace and plugs too.

For a small workshop such operation presents known difficulties: pig-iron plugs press in the aluminum case with a tightness. Thus to avoid microcracks and smyatiya, it is necessary to cool plugs previously in liquid nitrogen (temperature – 196 ° C), and the case to warm up to 160–170 ° With (above there can be harmful consequences). All this is quite difficult, labor-consuming and is often simply non-reproducible in semi-handicraft conditions. Therefore in rare workshops do not deviate the ordered conditions that directly pours out in loss of quality of landing and distortion of geometry of knot. It then correct, processing "in a place" saddles of valves a vertical drill or a sharoshka, and valves long and tiresomely grind in.

But today there is also other technique, extremely profitable both on labor input, and on an investment of means which thus guarantees high-quality results. It is reached by use of the original and almost unknown tool in our practice of the American company "Nyyuey" (Neway).

With its help restoration of worn-out directing plugs is made on a place, without a vypressovka! Special knifes rollers cause plastic deformation of metal, compensating wear of an internal surface of the plug, at the same time forming in it a spiral fillet which improves conditions of greasing of a core of the valve, and also serves as a peculiar labirintny consolidation, oblegachayushchy a task to maslosjemny caps.

Five knifes and set of development enter into a set for finishing processing of the plug. It is characteristic that all operations with the Nyyuey tool are conducted manually and are not connected with power supply or other energy from the outside.

Now about saddles of valves. At traditional methods of their processing directing sharoshka or a vertical drill freely rotates in the valve plug. Mills of "Nyyuey" have a motionless axis which is densely fixed already in the restored plug by being self-established broad tsangovy "pilot". The mill is put on an axis with a precision gap of 0,5 microns that provides the minimum admission of processing. Mills of "Nyyuey" at the expense of unique sharpening and a form of cutting edges form a special microrelief of the comb type on a surface of a saddle of the valve: extra earnings of the valve and a saddle occurs quickly and effectively, and need for grinding in disappears. Their productivity is high: any facet on a saddle of the valve turns out for 3–4 turns of the tool.

The last stage – restoration of working facets of valves. For this operation the Nyyuey firm offers the special Gizmatik-2 tool. The valve motionlessly fix in the special adaptation which, in turn, establish in a metalwork vice. Enough several rotations of a mill (axial giving обеспечивется the microlift) to receive an ideal concentric surface of the valve. Let's notice that on its working surface, as well as when processing saddle, the special microrelief also is formed.

Here, actually, and all. It is necessary to wash out and grease only all details, and it is possible to collect a head.

And grinding in? Let's remind once again: at work as the Nyyuey tool in this tiresome, long and tiresome operation there is no need. After pair processing "valve saddle" interface of both details occurs on very narrow corbel, practically on the line.

It is reached small (to one degree) by a divergence of corners of processing of working surfaces of a saddle and the valve (between them the so-called interferential corner is formed). In the first seconds of operation of the engine the area of interface increases for the account a smyatiya of superficial ledges of the created microrelief on facets, and then there is a necessary 100 percent consolidation.

At cost of a set of equipment about 400 dollars (depending on a complete set) "Nyyuey" can pay off in the first month of work, and at repair of engines of foreign cars to bring in the appreciable income.