Reasons for a broken piston

秦浪

2022/08/22

There are many reasons for a piston to break, such as a broken piston. The reasons are as follows, you can refer to:

Reasons for a broken piston:

1. It may be because of high temperature. This is a common phenomenon. Typically, the engine is still running with less water seepage, which can cause the pistons to burn or crack at high temperatures.

2. Consequences of lack of lubrication. Due to the delay or negligence of the owner, the oil is not replaced in time, the replacement of inferior oil, the replacement of substandard oil, the oil leakage, etc. , which results in excessive friction and wear, and also increases in temperature, etc. , which can lead to fracture under various conditions.

3. Reasons for manual assembly. The gap between the piston and the cylinder is too small, and the assembly is unreasonable; the gong is loose, such as loose linkage; or there are foreign objects or impurities on the cylinder wall due to negligence.

4. The opening of the piston ring is small, and the piston ring is broken first, which may cause this kind of failure.

5. There is serious carbon deposition on the top of the piston.

Carbon deposits on the top of the piston cause local overheating of the top of the piston, resulting in high temperature. When the local high temperature exceeds the melting point of the material, the top of the piston will burn and melt to form a fusion hole.

6. The piston ring is stuck or broken. The cementation or fracture of the piston ring will cause the piston ring to not closely fit the cylinder wall, and the heat of the piston top cannot be transferred away in time, and at the same time, it will cause the high-temperature gas to run down, causing the piston top and the piston ring groove to be ablated due to overheating.

7. The oil hole inside the engine block is blocked, or it may be caused by excessive wear of the parts on the cylinder wall, uneven wear, and lateral deflection and reciprocation.

8. The cooling system fails and the heat dissipation is not timely, such as water pump failure, cooling electronic fan failure, thermostat failure, etc. , which may cause the piston to break.

9. The quality of the piston is not required or even unqualified. When the piston is cast, there are defects such as pores, pores, micro-cracks, poor material or inclusion of other impurities. Under the action of high temperature and high pressure, these defects may be the reason for the combustion and fracture of the piston due to poor material, pores, pores, cracks, etc.

10. The driver misoperation. For example, if the oil is frequently bombarded, the engine runs at high speed and heavy load, resulting in excessive temperature and serious wear. If it goes on like this, it will be strange if it does not break, and it may even lead to more failures in other aspects.
11. Explosion vibration. This is mainly a matter of fuel quality. The main reasons for the explosion shock at startup are premature fuel supply time or ignition time, excessive carbon deposition in the cylinder, high compression ratio, premature combustion caused by hot spots on the top of the piston, and low gasoline octane number. When an engine knocks, its impact is multiplied. Under the action of thermal stress and periodic combustion explosion force, the piston produces thermal and mechanical fatigue, which eventually leads to combustion and cracking.
12. The engine is overloaded and overspeeded for a long time, or the engine has poor heat dissipation. The piston is subjected to high thermal and mechanical stress for a long time, and is prone to fatigue and ablation.

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