Analysis of the Influence of the Cylinder Body on the Position of the Base Face System

Diesel engine cylinder’s main bearing cover is tightened by torque Angle method, the bolt is subjected to high preload, and the crankcase wall is thin, which leads to deformation and displacement of the cylinder’s bottom face. As the processing of the bottom face system of the cylinder block was completed before the main bearing cover was assembled, the position of the bottom face system changed after the cover was installed, which finally showed that the position of the bottom face system was qualified in the process inspection, but it was out of tolerance in the finished product inspection. In this paper, the stress and deformation of 36D cylinder are calculated by finite element method. The actual displacement direction and displacement amount of the base face system were verified by analyzing the data collected by the process test. In this way, the machining process is compensated and the position of the bottom face of the cylinder block product is out of tolerance.