- reliability, efficiency, simplicity of design. You can add a list of positive moments of mechanics maintainability and low cost compared to other transmissions. But if the gearbox is more, all the advantages begin to flicker unpleasantly.
Wheel gearboxes are unpleasant, but often occurring on mechanics. In general, if something is more in the car when driving, then this thing is unpleasant, and even more unpleasant when there is an understanding that is faulty one of the main aggregates of the car. This problem is distributed not only to domestic cars, but also on foreign cars.
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Oil: maybe the reason in it?
There are several reasons why the gearbox starts to swell. The first, most common, oil level in the box. Many motorists do not give the meaning of the need to control the oil level in the gearbox. This leads to oil starvation in the main fifth transmission, which is above the rest. Due to the lack of oil, bearings begin to overheat and fail. This is accompanied by high tone, which manifests itself when moving on the fifth gear. Such a disease is treated with overflow per 100 - 200 grams of transmission oil above the level with its constant control.
Some may say that overflowing oil will cause it through the sealing compounds. That this does not happen, it is necessary first of all to clean the Sapun, and in the second, pour oil parts, gradually. For example, first 100 grams, and after some time, in the absence of leaks, still so much. You can also add a second seal on the Kutis kole.
The next, not less common cause of the sound of the gearbox is the poor quality of the transmission oil, filled into the checkp or incorrectly selected. If we talk about domestic cars, then, for example, the use of APIGL-5 category oil pumps in the transmission fluid pumps leads to rapid wear of synchronizers, which will cause noise of the box when switching. Therefore, it is necessary to use the transmission of the APIGL-4 class. Domestic oils of this classification are quite difficult to find, so you have to use lubricants of foreign manufacturers. But their use allows you to significantly extend the service life of the gearbox, avoiding different sounds when moving.
In addition, the insufficient or excessive viscosity of the oil used also affects the wear of the box parts and the availability of sound when it works. For example, a strongly thick oil with a viscosity of 85W-90 creates a solid film, protecting the gears from wear, but it makes it difficult to access lubrication to some details of the box, which may suffer due to oil starvation, prematurely fail. The gear shift will also be difficult due to the need for synchronizers to squeeze the surplus oil, which will again lead to the rapid wear of the parts. The first sign of a very thick oil will be on the cold and its disappearance on the heated unit.
Too liquid oil will cause the opposite effect, in which the oil film disappear will occur, accelerating wear of the gearbox parts, which will be accompanied again and the hum.
It is necessary to closely carefully approach the choice of transmission oil according to the recommendations of the manufacturer and experienced servicemen.
Additives to the oil: Is it possible to do without repair?
If the oil change does not help, the gearbox will, then it is necessary to repair the unit. Many can say about adding additives, but it does not help 80 percent of cases. According to the reviews of many motorists, adding additives can only force or not fully muffle sound support, but I will not finally solve the problem.
Chemically active substances contained in the additives-revitalizes form a metal-ceramic layer on the surface of the worn gears and bearings, which, according to the manufacturer, restores the geometry of parts and compensates for wear. Of course, if the turn of the gearbox is heard almost noticeably, it only began, the addition, for example, Hado, may well delay the problem with the repair of the checkpoint. But may not help if the problem is already so much, and the wear of the assembly units is significant. Then the repair is accurate.
Diagnosis and repair
As for the repair of the checkpoint, it is very important for a start to conduct the correct diagnosis of the possible malfunction of the unit, try to determine why the box gives howl without removing the aggregate. Typically, the box will not work in all modes, but at some speeds. If the howl accompanies movement by 1,2,3 transmissions, then this usually indicates problems with the bearing connecting the primary and secondary shafts, more precisely, its wear. The only way out will be replaced. But there is a small nuance - if a needle bearing, not having a climate, then the simple replacement of the needles may not help. At the same time it will be necessary to replace the shafts. And this is a serious repair.
It is also possible for the presence of a work pair of gears located on the primary and secondary shafts of these gears. Or with poor factory processing and installation after repair. One of the characteristic traits of the wear of the gear, it is a war-loaded load and its decline in the absence of traction. Worn bearing will be noise anyway - there is a load or not. But it is possible to determine exactly the causes of the transmission only by showing a specialist if the repair is done with your own hands.
If you are attended by the 5th gear, the priority, what needs to be done is to check and add oil into the unit if necessary, as already mentioned earlier. But if it does not help, it is most likely necessary to replace the gear of the fifth gear. This is determined by opening the box. Previously, by sound at high speed, it is possible to determine the cause - with a frankly worn out of the gear, with a peak of over 100 km / h - most likely, the bearing.
If the front-wheel drive car is working on all transmissions, then the high probability of wear of the primary shaft bearing. But his replacement often does not lead to a positive result, therefore it is not recommended to change it in the presence of a minor war.
Or maybe it's not a box at all?
Conducting the diagnostics of the gearbox must necessarily consider the fact that in the presence of a constantly increasing warning on all transmissions guilty in origin of sounds can be not only a gearbox. On models with a classic drive, the source of the war can be a rear axle reducer having a conical hypoid transmission. With the wear of the teeth, the gears or with a significant louche of the bearing bearing will accompany all the modes of movement. Such symptoms also accompany the all-wheel drive vehicle during the fault of the front axle. The sound will come from the center of the cabin, and is observed with loads.
Summing up
Doing the repair of a singing gearbox must be important to remember the poor quality of the manufactured aggregates and spare parts. It is not significant that the purchased parts or aggregates are new - defects can be in them. Sometimes, with minor noise in the checkp. It is easier to add the sound of the radio tape recorder in the cabin than trying to eliminate cricket several times to go through the box.
Good luck on the roads!
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