How to slip on the automatic transmission?
1. Allow the box to cool in case of a long passage
The main sources of heat in the automatic transmission is a torque converter and friction discs. Moreover, under heavy loads, the heat generation is quite large. The operating temperature of the transmission is comparable to the temperature of the engine, and may exceed it. Therefore, cars with automatic transmission have a special cooling system, the radiator of which is either integrated in the radiator of the engine cooling system, or – much less often! – installed separately and cooled by air flow.
Most often, adverse consequences arise for the very reason that during prolonged slipping in an automatic transmission, the temperature of the automatic transmission lubricant increases, which is called ATF (Automatic Transmission Flu> Do not forget that during friction of frictions the temperature jumps sharply and in them – up to 200-250 C. This heat stroke reduces their resource, and in some cases (if you do not stop slipping) leads to an instant transmission failure.
So in principle it is possible to skid, but not for long, periodically giving the box a break. However, the engine should not be turned off..
2. Do not skid on a cold machine
Similar consequences await you if you start to slip on an unheated car. Only in this case, the ATF liquid, on the contrary, has not yet warmed up to the desired level and has not acquired the necessary viscosity. With hasty actions, automatic transmission parts that come into motion with virtually no lubrication will wear out intensively.
Therefore, before trying to leave the automatic transmission from a snowdrift, turn on the R mode with the brake pedal depressed and wait about a minute. The torque converter itself pumps the necessary amount of lubricant, bringing it into working condition – after which you can start to swing the car, trying to pull it out of the snowdrift.
3. Lock the gear (on tiptronics or in L1, L2 mode)
Now about the buildup itself. At that moment, when the car stalls, a huge load on the torque converter (sometimes even a blow) is created, which can instantly disable it. When the temperature rises, the oil loses its properties (after all, in fact, the performance depends on the pressure created by the oil in the box), the pressure drops, and either the torque converter cuts it off (it’s also a donut) or the friction clutches burn out – this depends on the situation.
Therefore, with a long skid, the transmission must be fixed and not jump from one to another. And most importantly – switching from R (reverse) to D (or L1, L2) with a fixed gear can only be done through the brake pedal. It is impossible to press at the same time gas and brake!
4. Avoid the possibility of a sharp grip after slipping
Any increased load reduces the life of the clutches. This applies to slipping, and towing, and for long driving at top speed.
In an automatic transmission there is such a detail – a differential gearbox. inside there are small but heavy gears, an axis passes through the entire gear case… If a skid wheel gets on a hard surface, then an axial impact can be so strong that the axis rips out, the parts fly apart at a speed and pierce the automatic transmission body in several places at once …
Therefore, it must not be allowed that after a pro-Bucksian sharp grip occurs.
What cars can not skid?
Increased heat release in the torque converter can be critical if the cooling system has low efficiency (the automatic transmission cooling radiator is clogged with wear products). As a rule, this is found in cars with high mileage – old American monsters built in the 80-90s. It’s time for them to change the gearbox for a long time, and even better – to hand them over for scrap.
In addition, on old European and Japanese cars you can find boxes with an air cooling system. There are additional external vanes on the torque converter housing, with the help of which they organize the air flow to remove heat. Such automatic transmissions are cooled during movement, which means that it is not recommended to slip on them. However, what has been said applies only to the small-run ancient compact cars in our country. They are not intended for use in harsh conditions. Modern “Europeans” and “Japanese” equipped with automatic transmission do not belong to the number of “travel abroad from a snowdrift”.
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