What causes the Cummins generator set to produce the phenomenon of pulling cylinder

For the Cummins generator set pull cylinder management analysis of this problem, it is necessary to know that the cause of the Cummins generator set pull cylinder is very complex, there are design reasons, such as the selection of materials, the determination of the gap size, the installation of the device is appropriate to the medium, the structure is reasonable, the surface rough is appropriate, the arrangement of lubrication and cooling is perfect, etc. From the perspective of management, it may be caused by the following reasons:

Poor cylinder lubrication: insufficient cylinder lubricating oil or oil supply interruption, metal direct contact and pull cylinder. The reasons for poor cylinder lubrication are: too little oil in the oil pan or too poor oil quality, the temperature of the diesel engine is too high or the piston ring (mainly the oil ring) damage or failure.

Inadequate run-in: To get effective run-in in the shortest possible time, run-in time and load distribution must be considered. Under too low load even if the long run in can not run in, and if the rush to high load operation, it will cause cylinder. Therefore, in the run-in period of Cummins diesel engine should pay attention to: run-in period to increase the amount of oil injection; The piston ring should run for a period of time under low load after replacement; The piston and cylinder sleeve should be replaced after running-in and then increase the load.

Poor cooling: poor cooling will lead to cylinder, piston temperature is too high, poor lubrication; Poor cooling will make the piston and cylinder liner overheating and excessive expansion deformation, lose the original normal clearance and pull cylinder. The reasons for poor cooling are: cooling pump discharge pressure is not enough, water supply is insufficient or interrupted; Cooling water cavity rust or dirty; Water contains bubbles, accumulated in the cooling chamber is not released and caused by gas resistance; The water is too dirty and the temperature is too high.

The piston ring is not working normally: the opening gap is too small, so that the piston ring is broken; The gap between heaven and earth is too small, so that the piston ring stuck; Too much carbon makes the piston ring stick in the ring groove to lose elasticity, causing fracture or gas leakage; The opening gap is too large or worn seriously, resulting in air leakage. The leakage of gas destroys the lubricating oil film, making the surface temperature too high. After the piston ring breaks, the debris is easy to fall into the piston cylinder, causing the pull cylinder, bite cylinder.

Burning inferior fuel: incomplete combustion leads to more combustion residue; Post-combustion phenomenon is serious, so that the exhaust temperature is increased, and technical measures are not taken in time; Cylinder lubrication base is not appropriate. In addition, some diesel engines due to long-term overload operation, heat load increase, overheating expansion or poor moving parts in the cylinder.

Repair assembly error: When repairing assembly error, the piston pin clamp ring is missing or not fully loaded, and the piston pin of Cummins diesel engine breaks out and scratches the cylinder liner when working, resulting in cylinder pulling. Installation cleaning work is poor, the metal chips or hard particles into the cylinder will also cause pulling cylinder. In addition, the wrong piston ring installation, installation reverse, leakage can cause cylinder. Piston rings are divided into oil rings and gas rings. Oil rings are mainly used to scrape oil and improve the lubrication conditions of cylinder liner. The gas ring is mainly to ensure the seal between the piston and the cylinder liner. According to the different working conditions and pressure, the gas ring in the material selection and structural design is different, such as the wrong piston ring installation, installation or leakage can cause the seal is not tight or no scraping effect, the deterioration of lubrication conditions on the inner surface of the cylinder liner caused by the lack of oil to pull the cylinder. Therefore, we recommend that customers who buy Cummins generator sets should install self-protection control system to avoid such a large loss.

Jiangsu Meao Power Technology Co., Ltd. is an important manufacturer of diesel generators. The company mainly manufactures and sells diesel generator sets with power of 3-3000kW, mobile power station of 24-600kW, Marine emergency diesel generator set of 24-800kW, gas generator set, heavy oil generator set and all kinds of imported series, special series (trailer, static speaker, mobile lighthouse, container, etc.) diesel generator At the same time, we are engaged in generator set maintenance and after-sale service of generator set accessories.