If the damage can be repaired, what material is the crankshaft on the engine made of?

The forces on the crankshaft are extremely complex, it works under the combined action of periodically varying gas pressures, reciprocating inertia forces and their moments, and is subjected to huge bending and torsional alternating loads. At the same time, it is also a slender high-speed rotating part, so it requires strict dynamic balancing, and neither bending nor twisting is allowed to exceed a certain value.

As a result, crankshafts need to be made of very high-quality materials and subjected to a rigorous surface treatment process. Generally, it is made of medium carbon steel and medium carbon alloy steel such as CR and 35Mn2, and in recent years, ductile iron has been used more. After forging or casting, in order to improve the fatigue strength of the crankshaft and eliminate the stress concentration, it is also necessary to carry out shot peening treatment on the surface of the journal, and the fillet should be rolled out; In order to improve the surface hardness of the journal, it is also necessary to do high-frequency quenching or nitriding treatment on the surface of the journal, and finally finish.

In this way, the crankshaft has sufficient fatigue strength and stiffness to resist bending and torsion, and at the same time, the journal has a large enough bearing surface and wear resistance.

On the crankshaft, there is an oil passage that runs through the main journal, crank and connecting rod journal, and the pressure oil from the main oil duct of the lubrication system enters the main journal and the connecting rod journal to lubricate the main journal and the main bearing, and the connecting rod journal and the connecting rod bearing. However, due to the huge force on these two parts, there will inevitably be a certain degree of wear and tear in use; If the lubrication is poor or the engine is overloaded, other types of damage can occur.

Common forms of crankshaft damage include journal wear, cracks, ablation, bending, twisting, fracture, etc. Generally speaking, for crankshafts that are severely ablated, cracked or have been broken, they cannot be repaired and can only be scrapped; For crankshafts with excessive bending or twisting deformation, we can use pressure correction to repair them; For excessively worn crankshafts, we can grind to the specified repair size, and then select the corresponding oversized bearings to restore the mating clearance; If the wear is severe, the defect can also be filled with vibration surfacing or electrospraying, and then machined to the specified repair size. However, there is one thing to note here:

The crankshaft must be re-nitrided after grinding, otherwise the crankshaft is in danger of breaking.

However, in the actual engine repair process, the crankshaft is generally rarely repaired, and defects are directly replaced. On the one hand, because the repair of the crankshaft is more difficult, the process is more complex, the required precision is high, and the cost is relatively expensive, whether from the economic or technical point of view, it is not cost-effective; On the other hand, the vast majority of models now do not provide oversized repair bearings, and the crankshaft cannot be found to match the accessories after grinding; There is also a very important point is that now there are fewer and fewer enterprises with the ability to repair crankshafts, and many provinces only have such processing enterprises in provincial capitals, and it is really not worth it to repair a crankshaft and go back and forth several times. Therefore, now only some extremely special engines, its parts are difficult to buy, or the purchase cycle is very long, so that the crankshaft can be repaired at any cost, and more are directly scrapped.

The crankshaft on the engine is made of forged steel and ductile iron.

In general, forged steel and ductile iron are used.

Most of the crankshaft materials used in this are mainly forged steel and ductile iron.

Generally, these two things are used to form forging balls and ink balls.

Of course, it's two materials: satin balls and ink balls.

Forging balls and ink balls are two things to complete.

It is made of forging balls and ink balls, which can be replaced at any time.

Most of them use forging balls. Good ductile ink is composed of these two things.

The main crankshaft materials are forged steel and ductile iron.

There are two main types of crankshaft materials commonly used: forged steel and ductile iron.

There are many signs that an engine crankshaft is broken. The following is a detailed introduction to engine crankshaft damage: 1. Specific signs:

When the crankshaft is damaged, the crankshaft hoop will be loose, and if it swings up and down severely, the engine will be scrapped directly. There is no high-voltage electricity, no fuel injection, and the fault light on the dashboard of the car is missing. 2. The role of the crankshaft and the engine

It takes the force from the connecting rod and converts it into torque, which is output through the crankshaft and drives other accessories on the engine to work. The crankshaft is subjected to the centrifugal force of the rotating mass, the air barrier inertia force of the periodic change and the reciprocating inertia force of the celebration banquet, so that the crank bearing is subjected to the action of bending torsional load. The engine converts the thermal energy of gasoline and diesel into mechanical energy by pushing the piston to do work after combustion in the sealed cylinder.

If the crankshaft of the engine is broken, it can only be replaced with a new one, and the replacement method is as follows:

1. Unload the main bearing cover screws.

2. Use the sleeve joint rocker to remove the cover screws of the 100 spindle degree.

3. Use a word to loosen the main bearing cover.

4. Pry up the main bearing cover and take it down.

5. The crankshaft of the engine can be removed. Simply replace the crankshaft with a new one and install it in the opposite steps above.

Hello, the crankshaft is broken, if you repair it, it will be the same as overhauling the engine, change the crankshaft to lift the gearbox, I don't know if you ** repaired it, I just lift the gearbox here to remove the oil pan, I here labor hours cost 200 plus accessories oil pads or something, a total of 800 is enough.

At present, after the engine crankshaft is seriously damaged, it is generally not repaired, unless it is some imported engines, and the crankshaft value is relatively high, it is necessary to consider the use of cold welding, with machine boring and manual grinding;

Slight shingling, you can grind the crankshaft in the place where the boring cylinder is boring with a large tile.

The degree of wear needs to be checked before deciding whether to repair or replace the crankshaft.

If the crankshaft is broken, it will not fit tightly with the crankshaft ferrule, shake up and down, and the serious engine will be scrapped directly.

If the crankshaft position sensor is broken, the angle of the crankshaft can not be confirmed, the engine computer can not receive the signal of the crankshaft position sensor, in order to protect the engine will not ignite, do not inject fuel, the car shows signs that there is no high voltage, no fuel injection, no car Of course, the most obvious phenomenon is that the engine fault light on the dashboard is on.

The crankshaft sensor determines the position of the crankshaft, detects engine speed, and detects the top dead center signal for each cylinder, including for ignition control and for sequential injection. There are three main types: magnetoelectric induction, Hall effect and photoelectric type, and the failure of the crankshaft position sensor will have different reasons due to its different types

1. Magnetoelectric induction: The fault of the magnetoelectric induction crankshaft position sensor is that the engine cannot be started, and when checking the engine condition, it is found that the ignition is too late is the real reason why the engine cannot start. Reconnect the wiring, readjust the distributors, and check the ignition timing.

2. Hall effect type: Hall effect crankshaft position sensor is to control the engine sequential injection, ignition time and detonation, and the transmission signal is not within the normal range when the fault occurs. Check that the permanent magnets, magnetic plates, and integrated circuits are normal.

3. Photoelectric type: The fault of the photoelectric crankshaft sensor is that the engine accelerates poorly, and there will be automatic flame-off when starting, and sometimes there will be high-voltage electric sparks. The reason for the occurrence is that the ignition system is not working well, resulting in a weak high-pressure fire.

Check for low-voltage circuits, main relays, short circuits inside high-voltage ignition coils, faulty engine control units, and abnormal wear and tear of some mechanical components.

The bite with the crankshaft sleeve is not tight, it shakes up and down, and the serious engine is directly scrapped.

Summary. Hello, I'm helping you sort out the answers to your questions, please wait a while How to protect your rights if the crankshaft of a car engine is broken.

Hello, I am helping you sort out the answer to the question, please wait a while If it is not a problem caused by a scattered spring person, it belongs to the problem of vehicle quality, and then during the three-pack period, you can ask the manufacturer to replace it.

Crankshaft oil seal leaking engine.

The manufacturer is giving me a free change.

From July 18th to now, I haven't been dealt with yet, and I have been saying that the goods have not arrived, and from July 18th to August 6th, this time has made it inconvenient for me to travel, can I ask for compensation from the pilot.

At? You can ask this 4S shop to provide a substitute vehicle.

They don't drive on their behalf.

If you don't have a car, you can ask the manufacturer to pay you a certain amount of travel expenses.

The engine crankshaft is a very important part of the engine, which can convert the linear motion of the piston into rotary motion, convert the gas pressure of the piston and connecting rod into torque output, and drive the transmission system of the car, the valve mechanism of the engine and other auxiliary devices.

The stresses on the crankshaft are extremely complex, and it works under the combined action of periodically changing air pressure, reciprocating inertia forces and its torque, and is subjected to huge alternating loads of bending and torsion. At the same time, it is also a slender high-speed rotating part, so it needs to be tightly balanced, and the bending and torsion are not allowed to exceed a certain value.

Therefore, the crankshaft needs to be made of very high-quality materials and undergo a strict surface treatment. Die forging generally uses CR, 35Mn2 medium carbon steel and medium carbon alloy steel. In recent years, more ductile iron has been used.

Or after forging, in order to improve the fatigue strength of the crankshaft and eliminate the stress concentration, it is necessary to peenize the surface of the journal and roll the fillet into the round. In order to improve the surface hardness of the journal, the journal surface needs to be quenched or nitrided at high frequency, and finally finished. The treated crankshaft has sufficient bending and torsional fatigue strength and stiffness, and the journal has sufficient bearing surface and wear resistance.

The crankshaft has oil channels that pass through the main journal, crankshaft and connecting rod journal, and the pressure oil from the main oil passage of the lubrication system enters the main journal and connecting rod journal to lubricate the two friction pairs of the main journal and the main bearing, the connecting rod journal and the connecting rod bearing. However, due to the huge force on these two parts, there will inevitably be a certain degree of wear and tear in use; Other types of damage will occur if the lubrication is poor or the engine is overloaded.

Common forms of damage to crankshafts include journal wear, cracks, ablation, bending, twisting, and breakage. In general, badly ablated, cracked, or broken crankshafts cannot be repaired and can only be scrapped. For crankshafts with excessive bending or torsional deformation, pressure correction can be used to repair them.

For excessively worn crankshafts, we can grind them to the specified repair size and then select the corresponding oversized pads to restore the mating clearance. If the wear is severe, the defective parts can also be filled by vibratory surfacing welding or EFI, and then processed to the specified repair size. But there's one thing to note here:

The crankshaft must be re-nitridified after grinding, otherwise there is a risk of breakage.

But during the actual engine repair process, the crankshaft is rarely repaired, and if there is a defect, it is simply replaced. On the one hand, the crankshaft repair is difficult, the process is complex, the precision is required, the cost is expensive, and it is not economical and technical. On the other hand, at present, the vast majority of models do not provide overhaul bearings, and the crankshaft cannot be matched after grinding.

Another important point is that fewer and fewer companies have the ability to repair crankshafts. In many provinces, only provincial capitals have such processing enterprises, and a crankshaft is really not worth going back and forth several times. So there are only some extremely special engines, which are difficult to buy parts, or have a long purchase cycle, so that the crankshaft can be repaired at any cost, and more will be scrapped directly.