Excuse me, how is the car caused by the shaft bursting and burning tiles?

The main reasons for the engine to "burn and dig the shaft" are:

1) Poor manufacturing quality of the crankshaft. The surface roughness of the journal is poor, the cylindricity accuracy is low, especially the surface error of the journal of the crankshaft that has been ground during the overhaul is large, the surface of the journal and the bearing is not well matched after installation, the contact surface is too small, it is difficult to form an oil film, and the dry friction is caused.

2) Poor manufacturing quality of bearings. The alloy material is poor, the alloy material is loose, and the surface roughness of the bearing is out of tolerance, which cannot form an effective lubricating oil film between the shaft and the bearing.

3) The bearing cover is deformed, there is a gap on the back of the bearing, and the alloy and the bearing cannot be completely tightly fitted and loosens and falls off, blocking the oil channel, interrupting the oil supply and causing dry friction.

4) Incorrect installation of bearings, improper clearance adjustment, and too large or too small contact area will make it difficult for the contact surface between the shaft and the bearing to form a lubricating oil film.

5) The torque of the bolt is too small or the bolt anti-loosening measures fail, and the bearing is loose, resulting in the change of the gap between the shaft and the bearing, thereby affecting the lubrication.

6) The oil pump is seriously worn or the oil suction port filter screen of the oil pump is blocked, the oil supply pressure is low, and the oil is difficult to reach the specified lubrication position, resulting in dry friction of the bearing.

7) The oil passage is plugged by impurities, so that the oil leading to the crankshaft is blocked, resulting in dry friction between the shaft and the bearing.

8) The oil pipeline is damaged, the pressure of the oil circulation system drops, and the oil is difficult to reach the specified lubrication position, resulting in dry friction.

9) When the cooling starts in winter, the throttle is slammed, and the oil fails to pump loose to the bearing in a low temperature viscous state, and the surface of the bearing has traveled to an instantaneous high temperature, causing the metal to burn each other.

10) The engine is seriously overloaded, and there is a long-term low-speed and high-torque working condition, because the engine speed is low, the pump speed is also low, and the oil supply is insufficient, so that the high temperature between the shaft and the bearing pad is formed, resulting in "burning and digging the shaft".

11) The amount of oil in the engine oil pan is too small, and the bearing pad cannot be effectively lubricated and dry friction is formed.

12) Due to the damage of the cylinder head gasket and oil radiator, the cooling water seeps into the oil, so that the oil emulsifies and deteriorates, the viscosity is reduced or completely lost, and the surface of the shaft and bearing pad cannot form an effective lubricating oil film, resulting in serious dry friction.

13) The fuel system is faulty. The fuel atomization is not good, and the combustion is incomplete or non-combustion, so that the fuel flows into the oil pan along the cylinder wall and dilutes the lubricating oil, resulting in a significant reduction in its viscosity, and it will also cause "burning and digging shaft".

14) The use of oil with too high viscosity and high freezing point in severe winter, or the addition of a large number of oil-containing additives to the oil without selectivity, may cause the oil to flow too slowly in the oil channel and cannot be pumped to the bearing in time, resulting in dry friction between the shaft and the bearing.

15) Use inferior engine oil, so that the shaft journal can not be effectively lubricated.

Caused by a lack of oil in the shaft, a small or large gap between the shaft or pads.

Lack of oil, lack of water. Excessive humidity and so on.

According to Bian Xiao, many friends don't know much about some car knowledge. In order to facilitate everyone to understand these knowledge, today Bian Xiao will introduce to you the reason why the engine burns tiles and hugs the shaft? Interested friends can learn about this problem, which may be helpful to you.

The causes of engine bearing burnout include: poor oil quality, poor crankshaft manufacturing quality, illegal operation, etc. Engine bearing burnout refers to the burning of the engine crankshaft and the plain bearings that support its operation.

Due to poor lubrication between the crankshaft bushing and the connecting rod bushing, there is dry friction and semi-dry friction, resulting in high temperature, and the peripheral neck and bearing pad are sintered and crushed by each other, and the engine cannot run. 1.Poor oil quality, not using engine oil according to regulations, or filling inferior oil, more water, more impurities, high viscosity, poor fluidity, poor oxidation and corrosion resistance, slow heat discharge; In use, it is easy to gel and deposition carbon, aging and deterioration.

When rotating at high speed, the viscosity is greatly reduced, the oil film strength is low, and the wear is aggravated by poor lubrication. The oil is changed irregularly and is not added immediately when the oil is scarce, which aggravates the damage of the oil film, resulting in dry friction and erosion damage under instantaneous impact load. It is recommended to choose the right lubricating oil, especially the lubricating oil used in imported cars is irreplaceable by ordinary domestic engine oil. 2.

The manufacturing quality of the crankshaft is poor, the surface roughness of the journal is poor, and the cylindricity accuracy is low. Especially when grinding the crankshaft during overhaul, the surface error of the journal is large. After installation, the shaft journal and the bearing surface are not well matched, and the contact surface is too small, which is difficult to form an oil film, resulting in dry friction.

It is recommended to use a crankshaft of good quality. When using, pay attention to the length of its bearings. If it is too short, a reliable fit and good heat dissipation cannot be guaranteed.

If it is too long, it will cause deformation at the interface and affect the phenomenon of "gnawing the shaft". In use, the mating clearance between the journal and the bearing should be checked frequently, and adjustments and repairs should be made if necessary. 3.

When the engine is started cold, the oil lubrication is insufficient, and it runs at high speed or full load, resulting in poor lubrication effect; The increase in oil temperature and the decrease in oil viscosity destroy the formation of oil film on the surface of the friction pair, making it semi-dry, which aggravates wear. Failure to maintain in time, not cleaning parts on time, not dredging the oil circuit in time, and not adding or replacing the oil in time will affect the aging or dirtiness of the oil, block the oil circuit, and aggravate the wear, thereby prolonging the service life of the engine. Bad operation should be prevented, and maintenance should be carried out immediately.

The reasons for the engine to burn the shaft are: poor oil quality, poor crankshaft manufacturing quality, and illegal operation. Engine burning shaft refers to the phenomenon that dry friction and semi-dry friction occur between the engine crankshaft and the sliding bearing supporting its rotation due to poor lubrication between the crankshaft pad and the connecting rod empty dry tile, resulting in high temperature, and the peripheral neck and bearing pad sinter and occlusion each other, and the engine cannot rotate.

1.Poor oil quality, not using engine oil according to regulations, or filling inferior oil, with more water, more impurities, high viscosity, poor fluidity, poor oxidation resistance and corrosion resistance, and slow heat discharge; It is easy to stick carbon and accumulate carbon during use, and it will age and deteriorate. When running at high speeds, the viscosity will drop significantly, the oil film strength will be low, and the poor lubrication of the combination will aggravate the wear.

The oil is not changed regularly, and it is not added in time when the oil is short, which aggravates the damage of the oil film, causes dry friction, and causes erosion damage under the instantaneous impact load. It is recommended to choose the right lubricating oil, especially the lubricating oil used in the imported car can not be replaced by ordinary domestic oil. 2.

Poor crankshaft build quality. The surface roughness of the journal is poor, and the cylindricity accuracy is low. Especially when grinding the crankshaft during overhaul, the surface error of the journal is large.

After installation, the shaft journal and the bearing surface are not well matched, and the contact surface is too small, which is difficult to form an oil film, resulting in dry friction. It is recommended to choose a crankshaft of good quality, and pay attention to the length of its pads when choosing. If it is too short, reliable installation and good heat dissipation will not be guaranteed.

If it is too long, the joint will deform, causing the phenomenon of "gnawing on the shaft". During use, the mating clearance between the journal and the bushing should be checked frequently, and adjustments and repairs should be made if necessary. 3.

Illegal operation: When the engine starts cold, the oil is not fully lubricated, and the lubrication effect is not good when it runs at high speed or full load; As the temperature of the oil increases, the viscosity decreases, and the bright destroys the formation of the oil film on the surface of the friction pair, making it semi-dry friction and aggravating its wear. Failure to maintain in time, clean parts on time, dredge the oil circuit, add or replace the engine oil, resulting in aging or dirty engine oil, blocking the oil circuit, and increasing wear.

In order to prolong the service life of the engine, incorrect operation and timely maintenance should be avoided.

Millions of car purchase subsidies.

The crankshaft talks about the quality of Bisan and the tile is not good, and the finish of the journal and the tile surface is poor, especially for the vehicle that has been overhauled and replaced with the bearing bearing.

The large and small tiles are installed incorrectly, and the gap is adjusted improperly.

The gear of the oil pump is seriously worn and failed, the oil supply pressure is reduced, and the oil is difficult to reach the designated lubrication position, which causes dry friction of the bearing.

The oil passage is clogged with unclean impurities, which blocks the oil to the crankshaft and forms dry friction of the bearing.

The oil pipeline leaks, the pressure of the oil circulation system drops, and the oil is difficult to reach the designated lubrication position, forming dry friction of the bearing.

When the cold car starts, the throttle is slammed, and the oil has not yet been pumped to the bearing pad in a viscous state at low temperature, and the surface of the bearing has formed an instantaneous high temperature, causing the metal to burn each other.

The engine is seriously overloaded, and there is a long-term low-speed and high-torque working condition, because the oil pump speed is also low when the engine speed is low, and the oil supply is insufficient, but a high temperature is formed between the shaft and the pad, resulting in locking.

The use of inferior air filters causes large amounts of airborne particles to enter the engine, causing abrasive wear and even tile holding.

There are only two special cases where a serious bearing failure can occur due to oil factors.

Due to the infiltration of cooling water into the oil, the oil will emulsify and deteriorate for a long time, and the viscosity will be completely lost on the surface of the shaft and pad.

It cannot form an oil film, causing serious dry friction.

In winter, the engine temperature is too low, so that the fuel atomization is not good, and the combustion is not complete, so that the fuel flows into the oil pan along the cylinder wall.

Dilution of the lubricating oil will also cause "burning tile and holding shaft".

1. Low oil pressure. For example, the oil pump is damaged, the oil collector is blocked, the pressure adjustment of the oil safety valve is too low or damaged, and the oil is not added enough.

2. Improper selection of engine oil grade or serious deterioration of engine oil;

3. The engine temperature is too high. For example, the pump is damaged, the pump belt adjustment is too loose (if the pump is driven by a belt), the radiator is leaking, the radiator heat dissipation scales, dust and sludge are excessive, the thermostat is damaged, and the scale in the waterway is excessive;

4. The matching gap between the crankshaft shaft diameter and the bearing pad is too large, resulting in the formation of oil film. For example, severe wear, poor assembly, etc.;

5. The matching gap between the crankshaft shaft diameter and the bearing bearing is too small, etc.;

6. Work for a long time with large loads;

7. Parts quality problems;