Fault analysis of cylinder liner sealing ring failure in a certain type of diesel engine and its process optimization
LIU Dingding
WANG Yongchao
HOU Xiaoshuai
LUAN Yuqing
Abstract：To address the high failure rate of sealing rings during the press-fitting process of a certain diesel engine cylinder liner,the significant influencing factors causing sealing ring damage are identified through Failure Mode and Effects Analysis(FMEA).The effects of influencing factors on the press-fitting force are analyzed through experiments and with the help of Minitab software.A process optimization plan is proposed and tested for production validation.The results show that the high-risk influencing factors leading to sealing ring damage are the sealing ring assembly temperature,assembly oiling position,press-fitting speed,cylinder liner groove fillet radius,cylinder bore chamfer,and press-fitting force.The optimized cylinder liner assembly process is as follows:the measuring points for the cylinder bore chamfer are four points evenly distributed around the chamfer circumference,lubricating oil is applied to both the sealing ring and the cylinder bore chamfer,the cylinder liner groove fillet radius is 0.25 mm,the cylinder liner press-fitting speed is 5 mm/s,and the sealing ring assembly temperature is 60 ℃.The optimized experimental results show that the average press-fitting force of the cylinder liner is 1.128 kN,which closely matches the predicted optimal value,thereby confirming the effectiveness of the optimization measures.The actual production results show that the optimized process significantly improve the assembly quality and production efficiency of the cylinder liner.
Keywords：diesel engine cylinder linersealing ring failurepress-fitting processprocess optimization
Publication Date：2026-02-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 86-92 )