BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car

One of the most important indicators of comfortableness of the car – the level of acoustic noise in salon. It is known that driving on newcomers, just from the conveyor, cars – if they without serious defects – first can give pleasure. But how this idyll lasts long? A time later vehicle, on a trope of readers, turns into a rattle. Sometimes – quickly enough, to 15–20 thousand kilometers of a run. In other words, the active, a lot of going motorist can face this sad fact, without "having skated" also years.

The car grows old quickly. Still bystry the stuffing of its salon – from mechanisms of seats, their upholstery, elements of finishing of doors and a ceiling to various a key, buttons, plastic rychazhok, handles decays. All this if to use formal terminology, wears out: driving on the car even on quite decent roads begins to be followed by extraneous noises. The motorist hears scratches, knocks and even grunting. In what the prime cause of a sad metamorphosis? It is thought, the possibility of regeneration of the car in mobile noise orchestra, first of all, is defined by culture of its designing – what is called school. But schools as all of us understand, happen different.

At the same time transition of the car to this state can accelerate (to be slowed down) by actions of the owner, and they, owners, too different! Protects one car, watches each its whim, another treats it, as the enemy who was taken prisoner.

But we will return to school of designing. Having removed an upholstery of a door of old – "Saab", for example, – you will see various rychazhka, drafts, ropes, etc. Details shaky and are fixed they "simply" or "very simply"! It seems that the designer cared for that the mechanics did not jingle in day of sale of the car.

One of the most common causes of extraneous noise in salon – razbaltyvany the connected details because of their vibration wear. In mobile knots wear from mutual movement of details is added to it.

Why, for example, there is "itch" of any decorative panel if it it is dense, is not movably connected to a basis of a body or a door? In practice both the panel, and a basis vibrate, and is frequent – differently. Means, in their contact there are vibration movements which are wearing out material. Further – a vicious circle: it is more vibromovement – wear more, noise is stronger.

Characteristic dust in places of contact, traces of mutual attrition can be the testimony of vibration wear of some plastic details. Liquidate vibromovements – wear will disappear.

Vibration movements of details, similar to internal decorative panels of doors, often it is possible to minimize by means of additional fastenings, for example screws self-tapping screws. Happens, do differently: between the panel and a door establish laying from foam rubber, foam rubber, latex – the materials which are well extinguishing vibration.

As to fight against it, it is already told. There is one more way checked by skilled motorists: the panel from its internal party is pasted over with an additional layer of a noise isolation – though an old blanket. Business is labor-consuming, but decided on it it will be rewarded: knocks are suppressed almost completely.

In general, when it is necessary to be at war with the noise caused by vibration of any panel you should not treat it, as business obviously simple, easy, especially, if vibration of the rigid panel is damped by nothing (that is it is not extinguished). Here, even in addition strengthening it screws self-tapping screws, it is possible not to achieve desirable results, – having ceased "to itch" at one speed, the panel can give even more opposite vote on another. Use of soft laying usually gives positive effect.

So many time having mentioned the word "vibrations", not a sin to tell about what it there is a speech. Unfortunately, various details in salon, with different sizes, weight, rigidity etc., have also the "favourite" frequencies of vibration corresponding to them on which willingly respond "itch", percussions, rustles, etc. Vibrations are caused by operation of the engine, transmission, transmission, rotation of wheels, at last, roughnesses are expensive. The range of frequencies is so rich that any detail, having received illegal freedom to vibrate, by all means will find "the" frequency.

This freedom should be limited anyway. Some switch vibrates? Glue to it a thin strip of foam rubber or draw in an additional spring. Draft in a door jingles? Prop up it a small pillow from the same foam rubber... or slightly tie up an elastic band to a door framework.

Having glanced under the dashboard, you will see a picture of utter chaos: plaits of wires and separate wires, numerous electric sockets, ropes. Nearby devices, switches. Right there a collection of the ownerless bolts-gayechek which got here even at assembly of the car. All this jingles, clanks, especially, in the winter when plaits of wires from a frost firm as a stick, and the same as it, beat design details. That is why many motorists literally fill space under the dashboard foam rubber or latex.

By the way, amazing results are yielded by an additional noise isolation of a motor compartment and at the same time space under the dashboard. Do it by means of a piece of the foam rubber pasted on a cardboard which is put from pedals up to an edge of "Torpedo". It is clear, that such "muffler" has to be reliably fixed and not interfere with management.

Noise in interior of the car in many respects is explained by properties of the used materials. Unfortunately, often details make of plastic, unstable to wear, fragile etc. Naturally, "razbaltyvaniye" of the knot collected from them can occur soon.

If details work in the conditions of at least a little increased temperature, it is important that they did not warp, did not take seat. In practice we see this process in any our car.

Special kind of noise – scratches. The reasons of a scratch can be the most different, but all of them unite the prime cause – the movement of one detail concerning another in the pressed state and work of friction forces. Why, for example, not to begin to creak to a dashboard edge if the door in the closed state densely is pressed to it? All body on roughnesses of the road "breathes", details mutually move, causing a scratch. It will disappear if you manage to eliminate "illegal" contact. Most often at the same time weaken an inhaling of fixing screws and displace the dashboard, it is how necessary.

Springs of seats in places of contact with a framework have a "protivoskripny" covering. But its layer is quite fragile, it wears out. And here to you – a scratch. It is possible to eliminate it differently. One puts on a plastic tubule a spring, another reels up an insulating tape, the third greases with graphitic lubricant. All ways rather frivolous – these measures last not for long.

The scratch in hinged connections best of all is eliminated exactly with periodic use of graphitic lubricant.

One more kind of a scratch – extremely unpleasant sound arising at turning on of the fan of a heater when the shaft of the electric motor rotates in stator plugs without lubricant. Here an exit one – dismantling of the engine, cleaning of dirt and lubricant completion.

As we see, it is possible to get rid of a scratch in two ways – or to eliminate mutual movement of densely pressed details, or to grease the rubbing details.