E30 series BMW 3

since 1983-1994 of release

Repair and car operation

One of the most important indicators of comfortableness of the car – 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 is long? Vehicle any a time later, on a trope of readers, turns into a rattle. Sometimes – quickly enough, to 15–20 thousand kilometers of run. Differently, active, much going motorist can face this sad fact, not "kickbacks" and year.

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

At the same time transition of the car to this condition can be accelerated to (be slowed down) by actions of the owner, and they, owners, too the different! One car protects, watches each its whim, another concerns her, as to the enemy who was taken prisoner.

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

One of the most widespread reasons of extraneous noise in salon – razbaltyvany the connected details because of their vibrating wear. In mobile knots to it wear from mutual moving of details is added.

Why, for example, there is "itch" of any decorative panel if it it is dense, is motionlessly connected to a body or door basis? In practice both the panel, and a basis vibrate, and is frequent – differently. Means, in their contact there are the vibrating movings which are wearing out a material. Further – a vicious circle: the vibroperemeshcheniye are more – wear more, noise is stronger.

The characteristic dust in contact places, traces of a mutual istiraniye can be the testimony of vibrating wear of some plastic details. Liquidate vibroperemeshcheniye – wear will disappear.

Vibrating movings of the details similar to internal decorative panels of doors, often it is possible to minimize by means of additional fastenings, for example screws-samorezami. 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 against it to fight, it is already told. There is one more way checked by skilled motorists: the panel from its internal party paste over with an additional layer of a noise isolation – though an old blanket. Business labor-consuming, but solved 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, it is not necessary to treat it, as to business obviously simple, easy, especially, if vibration of the rigid panel nothing демпфируется (that is it is not extinguished). Here, even in addition strengthening it screws-samorezami, it is possible not to achieve desirable results, – having ceased to "itch" on one speed, the panel can give even more opposite vote on another. Use of soft laying usually gives a positive effect.

So many time having mentioned the word "vibrations", not the sin to tell, about which there is a speech. Unfortunately, various details in salon, with the different sizes, weight, rigidity etc., have and "favourite" frequencies of vibration corresponding to them on which willingly respond "itch", postukivaniye, rustles, etc. Vibrations are caused by operation of the engine, a 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, "the" frequency by all means will find.

It is necessary to limit this freedom anyway. Any switch vibrates? Glue to it a thin strip of foam rubber or draw in an additional mainspring. Draft in a door jingles? Prop up it a small pillow from this foam rubber... or slightly tie up an elastic band to a door framework.

Having glanced under the dashboard, you will see a picture of full chaos: plaits of wires and separate wires, numerous electric sockets, ropes. Nearby devices, switches. Right there a collection ownerless boltikov-gayechek, got here even at car assembly. 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 on design details. That is why many motorists literally fill space under the dashboard foam rubber or latex.

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

Noise in car salon in many respects speaks properties of the used materials. Unfortunately, often details carry out from 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 were not jarred on, did not take seat. In practice we see this process in any our car.

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

Springs of seats in places of contact to a framework have a "protivoskripny" covering. But its layer is quite fragile, it wears out. And here to you – a scratch. To eliminate it it is possible differently. One puts on a plastic tubule a spring, another reels up an insulating tape, the third greases with graphitic greasing. All ways rather frivolous – these measures suffice for a while.

The scratch in sharnirny connections is best of all eliminated exactly with periodic application of graphitic greasing.

One more version of a scratch – the 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 greasing. Here an exit one – engine dismantling, cleaning of dirt and greasing completion.

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