How can you accidentally kill the engine by briefly turning off the ignition

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May 28, 2022, 23:06 | Auto

Why you can't turn off the engine suddenly when stopping.

How can you accidentally kill a motor by briefly turning off the ignition

Few car owners know that the engine can fail even because it was turned off immediately after stopping. Why this happens and how to avoid this trouble, informs Ukr.Media.

Cars with turbocharged engines are often equipped with a so-called turbo timer to prevent the turbine from overheating. Thanks to this simple option, after turning off the ignition, the engine and radiator fan of the car continue to run for several minutes, cooling the turbine and the engine as a whole.

Few people know that exactly the same technique is more than relevant for atmospheric engines, especially when the weather is very hot. Imagine that you have just rolled with the wind under the scorching southern sun, squeezing the last of the engine and brakes. At the same time, the motor, forced by you to produce more energy, produced an increased amount of heat along the way.

And so, after such a drive, you stop at the first-best store to buy some water. At the same time, you are, of course, muting a fired-up power unit, which did not have the opportunity to cool down to a more acceptable temperature for it. At this moment, all processes in the engine stop, including the operation of the pump fan, which is responsible for the circulation of the coolant in the system.

When the pump stops, cooling of the cylinder block stops. Hot antifreeze rises to its head and cools there very slowly – it's hot outside! As a result, overheating of both the head and the upper part of the cylinder block itself occurs. After several or even one such overheating, the cylinder head can be deformed.

And this, in turn, will lead to antifreeze getting into the lubricant and vice versa. The final result of such a “fluid exchange” well known: engine overhaul. Note that many modern cars are equipped with protection against similar situations. Their electronics decide for themselves: whether it is necessary to run the coolant through the system and turn on the fan already after the ignition key has left the larva — to prevent the engine from overheating. Sometimes the fan of such a car continues to work for another 5-10 minutes after stopping the power unit, cooling the engine.

If you are not sure about the existence of such protection in your car, take the rule: before turning off the engine, let it work idling for several minutes. During this time, the space under the hood and the engine itself will have time to cool down to an acceptable temperature. This way you will preserve its health and, in the end, save a considerable amount on repairs that did not take place.

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