Analysis of the 'cylinder pulling' or 'cylinder biting' of the generator set

Many users are interested in dieselGenerator setThe reasons for 'cylinder pulling' or 'cylinder biting' are not very clear. The technical staff of Haixing Generator Set Manufacturer came to popularize diesel among Guangfa users.Generator setTechnical knowledge of cylinder pulling:
1. What is 'pull cylinder'?
'Pull the cylinder' is also called 'biting the cylinder'. It is stripe-like, colored damage that appears on the surface of the cylinder and piston rings along the direction of piston movement. Many customers of Haixing are very troubled by the phenomenon of cylinder pulling in diesel generator sets. When cylinder pulling occurs, the wear of the cylinder liner is very severe, which can reach dozens or even hundreds of times of normal wear.
After a cylinder pull occurs, the external characteristics of the diesel engine pull steel are that the sound changes and black smoke is emitted from the exhaust. The consequences are that the working surfaces of the piston, piston ring and cylinder liner are damaged, the gas seal fails, the consumption of engine oil and the amount of blow-by gas increase rapidly, making the engine unable to operate normally, and even in a short period of time, due to the failure of the piston, piston ring and cylinder The set was bitten to death and the car stopped.
2. What are the causes of 'cylinder pulling'?
The main reason for the cylinder pull is actually that the surfaces of the piston, piston ring and cylinder liner are 'welded' and strained due to high temperature. That is, dry friction occurs between the piston and the cylinder liner due to the interruption of the oil film. The hot friction heat causes the metal to micro-melt and adhere, and the nearby metal particles are torn off. The fundamental cause of cylinder pull is the interruption of oil film. According to the requirements of gas sealing, the gap between the piston ring and the cylinder liner should be as small as possible, which makes their lubrication conditions very unfavorable. The friction between the cylinder liner and the piston ring depends on the elasticity of the piston ring, operating temperature, sliding speed, oil film distribution, parts quality and running-in conditions, etc. When the contact surface is overloaded, the cylinder liner surface and the piston ring working surface are violently rubbed due to direct contact, which generates a large amount of friction heat and causes the temperature of the working surface to rise sharply. The consequence is that the two friction surfaces are welded and adhered. Cause strain.

It can be seen that poor oil supply, serious gas blow-by, and excessive contact stress of parts destroying the oil film are the main causes of cylinder pull. In addition to lubrication, fit clearance, and parts manufacturing quality, poor use may also cause cylinder pulls. Specifically, the following points are:
1. The matching gap between the piston and the cylinder liner is too small, or there is no good running-in before formal load operation.
2. Poor lubrication, such as small gaps, thin engine oil or no oiling during assembly, etc.
3. Diesel engine overheats.
4. The body is not clean during assembly or the piston is installed too tightly.
5. The piston and piston rings are of poor quality.
From the perspective of use, attention should also be paid to avoiding sudden increases in load or emergency stops. Try to use the crankshaft to rotate the crankshaft a few times before starting to keep lubricating oil on the friction surface.