When the engine goes into a spin, its speed increases sharply and the arrow on the tachometer moves into the red zone. Black clouds of smoke burst from the exhaust pipe, sometimes together with flames. This all happens suddenly and is beyond the driver’s control. This behavior can be exhibited by the diesel in any state:
The first case is the most dangerous, especially for a novice driver. When the engine starts to run down from a normal operating mode, the car accelerates uncontrollably. An accident is almost within arm’s reach if the driver doesn’t get his bearings
If it fails in neutral, a failed diesel engine can blow its head off and scatter its contents around the vehicle. That’s a dangerous situation, too, because you can get shrapnel wounds, like in a grenade explosion.
Why this happens
The reasons for such a condition of the diesel engine may be:
Why does the diesel go wrong?? In the construction of diesel engines, control over fuel flow into the cylinders is carried out by a fuel pump. Centrifugal regulator keeps RPM at the proper level by coordinating the flow of fuel. The speed of the pump depends on the speed of the crankshaft. Failure of the fuel rail causes malfunction of the pump and uncontrolled inflow of fuel into the cylinders, which inevitably affects the acceleration of the engine. The faster the shaft rotates, the more fuel is poured into the combustion chambers. The vicious circle.
If this mechanism seizes up, either the engine stops because of the lack of fuel capacity or the engine goes haywire from its overabundance. This causes engine failure, with all the consequences:
Diesel engine goes haywire: turbine failure is the cause. Insufficient tightness of the unit can cause oil leakage, which burns up very easily and takes a long time. Why is the engine oil flowing uncontrollably?? Due to the faulty tightness of the node, oil, together with air, can enter the engine, which perceives it as a resource of power and begins to run. Oil can collect in the intercooler or intake manifold.
How to turn off the motor
If the driver is able to quickly turn off the engine, in this case, the dire consequences may not occur. However, do not try to stop the engine by turning the ignition key. The engine can be shut down in the following ways:
If the car has an automatic transmission, you can do this:
In this case, the engine will stall because of the high mechanical load without moving the car.
There is another way. As soon as you feel an unauthorized acceleration, press the brake immediately, put the transmission in neutral, and pull the car to the side of the road. The engine will keep running for a while, then stall. You call the emergency services at the same time.
What else you can do? Try to turn off the engine yourself with a fire extinguisher. You need to open the hood and spray the contents of the fire extinguisher all over the underhood surface. Carbon dioxide CO2 will work as air, which is necessary for burning fuel resource: it will stop work of engine.
Block air line (air intake) can be blocked with some object such as a sweatshirt or a piece of plywood (you can say goodbye to it at once). Don’t try to do it by hand! If your car has a mountain brake, you should engage it: this emergency device will cut off the air supply to the cylinders.
Disconnecting the tube is a longer process that will not work anyway. You simply won’t have time to complete the disconnect because the motor will beat you to it and fail anyway.
If the car is covered with puffs of black smoke the reason of trouble in an intake manifold. Move away from the vehicle and call the emergency services.
What to do after the engine has stopped
Even if you were able to shut off the engine, do not try to start it again. Leave your car on the roadside and wait for a tow truck. If the car is in the middle of the road, manually roll it to the side of the road. Do not try to start the engine!
Now the car needs to be repaired. In the car service center should investigate in detail the cause of the disorder and eliminate the problem. The prevention of such cases is:
If the engine is worn out, there’s a good chance of oil leaking into the cylinders.
Ways to stop the engine in gear
There are several ways to shut off the diesel in the spreader.
- In any case the first thing to do is to switch on “emergency stop” and try to drive off the road. Next, you can try to stop the car with the key or the “Start/Stop” button. This method does not always help.
- It is also possible to turn on the highest gear on the mechanics or automatics in the mode of mechanical shifting. Press down on the brake pedal as firmly as possible. It may help to stop the engine. But the method does not work in all cases.
- In a higher gear, you can also try to start. The engine might stop. But sometimes this doesn’t work.
- That’s why it’s best to cut off the fuel supply by cutting the fuel hose or unscrewing the nozzles. Often this helps to stop the engine, but there are exceptions.
- The best way to stop the diesel in the range is to close the air damper. It can be done manually or with a special button. If there is no such a flap, you can shut off the air supply to the engine with your own hands. It is necessary to use cardboard, a piece of plastic or a sheet of metal. Cloth is totally unsuitable for this!
- In the worst case, when there is nothing you can do, you must try to put the handbrake in a safe place. In this case, the driver and passengers need to quickly leave the cabin. No-one should be in the vicinity of a running vehicle emitting acrid smoke. And the diesel will stop in this case due to malfunction or lack of fuel and oil. This method will not save the power unit and possibly the car itself. But it will save the health and life of yourself and others.
Consequences of diesel engine breakdown/
Once the power unit has stopped, do not even attempt to start it again. The car should be taken from the place of breakdowns by a tow truck. Whether it will be possible to save it after these events and how much the repair will cost will become clear after diagnostics in an auto service center. And, to keep the diesel from going haywire, you should perform regular maintenance and monitor its condition.
Plan of action in case of engine malfunction
Many motorists have already worked out a certain plan of measures, which are recommended to perform in case of equipment failure.
- If the engine rpm for some reason began to increase sharply, it is necessary to turn off the ignition, the transmission. Very often the driver does not always have time to notice the increase in rpm in time. At the initial stage of their growth, it is possible to shut down the engine in the usual way.
- If possible. move to the side of the road;
- If necessary, open the hood to gain access to the air intake;
- It is recommended to turn on the emergency lights;
- The air intake opening must be covered with a thick cloth. Truckers use a sweatshirt for this purpose. If there is a carbon dioxide fire extinguisher in the car, use it. The jet is directed into the air intake. As this gas is not flammable, the powerful stream will make the engine “bang”, which will bring it to a halt;
- You can’t start the engine anymore. Otherwise, the car owner will see how his engine is dying. Have the vehicle towed or towed to a repair shop.
If for some reason, the driver can not perform these manipulations, then you should move away from the car at a small distance and start calling specialized services to help.
If you perform the above actions in time, it will only lead to the fact that you will need to repair the engine, possibly and replace the turbocharger. However there will be no other serious consequences.
Specialists do not recommend repairing equipment by your own forces, because the slightest fault will cause the situation with the disorder will be repeated. It is best to have the diesel engine repaired in specialized centers. Therefore it is not worth saving on the work of professionals, so as not to pay twice.
Although history knows several cases when the gasoline carburetor ruined, the problem is still the fate of diesel units. Every owner of a diesel car has heard horror stories about how a “friend of a friend”‘s engine began to uncontrollably and spontaneously increase the RPM to the practical maximum, as a result of which the power unit simply collapsed. Why does this happen and how can it be avoided??
What is the difference in the diesel engine and how to stop it
A diesel engine is famous for its efficiency and good traction, but in a deplorable state it can give its owner an unpleasant surprise. go to pieces. What it means and what measures should be taken. we will tell in today’s article.
The phenomenon of the mixture
Dissipation of a diesel engine is an uncontrolled increase in the speed of the crankshaft. As a rule, the rpm rises to a maximum level, which is a destructive force for the engine.
As you know, rpm in a diesel engine is regulated by the fuel. The more combustible mixture, the higher revolutions. Therefore, there are two reasons why the runoff occurs:
Failure of piston rings, as a result of which, the oil from the sump starts to flow into the cylinders and burn.
In this situation, there are several ways to stop the engine and go for repairs.
How to stop the diesel engine in the runaway?
The problem has always been in the piston rings since the days of old Kamaz trucks. In this case, drivers have simply punched the oil pan so that the oil leaks out and no longer participates in the combustion process. The disadvantage of this method is that it is very difficult to pierce a hole in the sump, and in general, the problem may be in the ramp. And wasting time puncturing the sump also in vain leads to the death of the engine.
This is how to prevent stuck ramp: just bite the fuel tubes. The engine stops because of a lack of fuel. The method also takes place, but not in the case of oil, and sometimes there is nothing to “bite” the tubes.
How to stop the diesel engine runaway?
In the case of such a problem, it is an involuntary increase in rpm that exceeds the norm. And they are beyond any control. Most often, you can notice this malfunction during start-up or when resetting the load. Mostly, the diesel engine breaks down, although sometimes it can happen with a carburetor, gasoline engine. Also modern units are less prone to this kind of failure, i.e.е. The older the car, the more likely the problem.
Detect it quite simply, the speed rises sharply, oil is thrown out of the muffler, which is accompanied by a thick emission of smoke. The cause of this breakdown, most likely, is a faulty fuel rail of the fuel injection pump (high pressure pump for fuel), or rather its jamming, so that the fuel comes into the cylinders in an unlimited amount. The higher the revs, the more oil goes into the combustion chamber. The negative feedback circuit is opened and, depending on the AVR position, the engine either shuts down or runs wild.
The second reason is oil entrapment. If the engine is strongly worn, the gases, bursting through the piston wall into the crankcase, catch the oil mist and carry it into the collector. Given the fact that the oil contains enough energy, the engine speed starts to increase sharply and the oil entrapment is more intense. There is one more reason, why the engine goes to pieces. it is a turbine failure or the piston burnout. And if the oil has accumulated in the intercooler, the breakdown can happen again.
There are many reasons why a diesel engine can go wrong. If it is a turbocharged engine, there is a good chance that this is the cause. The element is cooled by the oil. Sometimes there are leaks. As a result, the mechanism is unable to provide boost. Engine rpm involuntarily increases. As they increase, the oil pump begins to pump lubricant faster. As a result, it enters the combustion chamber. There’s black smoke coming from the tailpipe.
With such a malfunction, the unit can even be left without lubrication. Because all the oil has gone into the exhaust pipe. There have been cases where, even after the fuel supply was turned off, the unit continued to run purely on grease. And even if this process lasts no more than a minute, it is enough to cause the diesel to break down. It happens especially often at old military engines. They are designed to consume fuel oil and kerosene. Therefore, do not be surprised that after the fuel supply is cut, the engine continues to run further. If a diesel engine has gone haywire, the crankshaft may break in two. It does not necessarily rip out the cylinder block and fly away with the splinters. In some cases, the engine will continue to run, but with a characteristic knocking. What else happens when the diesel is going bad? Engine temperature rises as the RPM increases. It overheats quickly. Also if it is a leak from the turbine, it is possible combustion in the area of the exhaust manifold. Jamming of pistons occurs in a matter of minutes. And it does not matter what at the moment the force of inertia of the flywheel. Even if the car is standing at idle, it is possible that the crank bolts and other elements of the crank mechanism may fail.
Diesel engine runaway is an uncontrolled increase in crankshaft RPM. As a rule, the rpm rises to a maximum level, which is a destructive force for the engine.
As you know, the speed of a diesel engine is controlled by the fuel supply. The more combustible mixture, the higher the rpm. Therefore, there are two reasons for the appearance of the runaway:
Failure of piston rings, as a result of which, oil from the sump begins to flow into the cylinders and burn.
In this situation, there are several ways to stop the engine and go for repair.
Diagnostics of diesel engines
As mentioned earlier, the engine can go into disrepair immediately after starting or after a sharp decrease in load. You can diagnose malfunction on the tachometer: the idle speed will not be at a normal level. In addition, there will be a sharp rumble of the engine, accompanied by increased production of black exhaust smoke.
As for driving in gear, the car will independently begin to pick up speed very quickly. Here it is worth saying that this behavior of the machine is extremely dangerous, and therefore it is necessary to take quick and decisive action.
First, engage neutral gear and stop the vehicle at the curb. It is better if it is in an unattended area so as not to pose a danger to others. Then you have to stop the engine. If the engine has gone into disrepair, it will not be possible to do it in the usual way, so you need to get out of the car and turn off the engine forcibly. To do this, you can cut the fuel pipes. That way, the fuel supply will stop and the engine will stop. The tubes are located on the gas tank or on the fuel rail under the hood. Which ones to cut is your choice, but it should be based on how fast you act.
Another way is “oxygen starvation”. You need to remove the air filter, or without removing it, plug the air pipe with a thick cloth or any other material. This way the air will stop flowing into the combustion chamber and the engine will stop. Further movement is only possible with a tow. Unfortunately, it is not possible to move with this engine.