Engine
Engine
Posted By nextmg

Why overheated engine?


Engine Overheating – an unpleasant event that could result in the emergence of a more serious problem. But, as we know, every effect has its cause. On why the engine runs cooler than it is dangerous, described in the article below.
Overheated engine does not always boil.
Before we talk about troubleshooting, worth a little look at the cooling system.

Cooling system:

Engine Shirt. The cylinder block has a cavity, through which water circulates, it is necessary to take the heat from the hot surfaces.

Water pump. Another of its name is the water pump. Usually, it is driven by a V-belt, which is rotated by the crankshaft. Often, the same belt is used to drive the generator.

Temperature sensor. Typically, it is filled with some paraffin can not be repaired.

Thermostat. A device which, depending on the fluid temperature, it restricts movement of the cylinder block to the radiator.

Radiator. It is a tank 2 which are interconnected by pipes, generally it is made of aluminum or copper. Copper is preferred because it is more thermally conductive.

Expansion tank. During boiling coolant, its volume increases, cooling after he comes back to normal, fluctuations in the volume of data just the same tank and smoothes.

The interior heater.

Overheated engine: Causes.

Well, after we have familiarized with the basic nodes can talk about typical faults, which are the most common.

A temperature sensor fault. Before you run to eliminate the damage, make sure that it is present. We will not go into details on how to check the temperature sensor, just to remember that this may be the most simple reason.

Faulty thermostat.

Low coolant level. The fact that each engine’s cooling system is designed for a certain level of liquid therein. After all, in order to preheat boiler bucket of water it takes longer than one kettle. The same principle works here as soon as antifreeze little, really hot.

Defective steam valve on the lid of the expansion tank or radiator. The pressure in the cooling system of the engine sometimes exceeds 3 MPa, and the liquid boiling temperature rises to 130 degrees, if the pressure is lower than it should be in the system, then it leads to boiling of coolant.

Corrosion engine jacket. In this case, the liquid which circulates in the engine block can not remove heat from the working surface, because not only has access to them. Typically, this is a consequence of the large scale on the walls layer jacket. To solve this problem, you can wash the engine block, it is recommended to use a phosphoric acid solution.

A clogged radiator. Its construction is such that the tubes which connect the two tank, has a small diameter, this leads to the fact that they are frequently clogged. In addition, it is desirable to wash the space between the plates, because it also often becomes clogged with dust, the tram, the remains of insects and other debris.

Poor fuel. Yes, such a cause can also create a lot of headaches. The whole essence of this is that low quality fuels has an octane number less, respectively its combustion time increases, and hence the operating temperature increases. It is also dangerous because it can lead to progaraniyu exhaust valves.

Too early ignition. This problem is accompanied by a characteristic knock engine for gasoline powertrain simply set the ignition timing and fuel injection, it is desirable to make a diagnosis. It can identify the malfunction of a sensor, generally cause a knock sensor, which is installed on the cylinder block.

Broken drive belt. This type of damage is accompanied by unprecedented ease of rotation of the engine crankshaft, she felt even at the hearing, as well as the lack of battery charging. In most engines is driven by the same belt, and that such breakage generator respectively can be diagnosed simply because the charge lamp lights.

Well, perhaps, the last reason, which is also found quite often, it is the fault of the fan motor . Its the easiest way to diagnose if the power unit up to operating temperature is gaining slowly, and after it quickly.

How dangerous motor overheating.

The piston unit struck – a brotherly hand.

So, we talked about why the engine is overheating. As you can see, the reasons in fact not so much, but the consequences could be much larger, ranging from simple oil changes to a complete engine kapitalki.

The consequences of overheating the motor.

Melting pistons. Many may think that this is quite a serious problem, but not all that bad actually. Pistons top covered with a layer of tin, it is necessary to just when the pistons are heated strongly, they are expanding the most, respectively, begin to cling to the glass cylinder. Aluminium is not so soft metal, respectively, it can damage the cylinder wall.

If the engine has been heated further, the consequences could be more dire. First of all, when the temperature rises strongly diluted oil. And as you know, without the engine oil can be easily damaged. Lucky if cranked liner, but the crankshaft will be repairable. If we consider the worst scenario, the crankshaft may simply collapse, that is, the crankshaft will break in half. And not necessarily that the engine will stall at this time.

The worst misfortune that can happen in such a situation, it is a wedge. It is that the piston ring just prigarayut to the cylinder walls. In this case, they paired with a piston pin, a piston tearing into several small pieces which then fall into the crankcase. Some engines after such an event yet to be repaired because they are the liner, however, such as in VAZ, in which the cylinder block cast, it’s impossible.

Another case, which is worth seeing, it is the so-called fraternal hand. It consists in that the piston, after being stuck, is rotated around the piston pin and then jumps out through the side wall of the cylinder, respectively, he just breaks the block. Once the engine went hawking, boiled or does not reset the speed, it is desirable to stifle it. But it is not necessary for him to approach the head or the body, because the brotherly hand, jumping from the block knocks pieces of metal with frightening speed.

To start, you need to pay attention to the temperature of the power unit, if it is slightly higher than the normal working, it is necessary to stop, to give work to the engine at idle. If the temperature has already exceeded a critical value, the motor must be immediately drown. Then, wait until the power unit to cool down, or in any case not to pour cold coolant as the engine, after it comes into contact with the coldest antifreeze, just crack.