This article deals with the construction,property and process of All sealed box type nitrocarburizing production line and the use of the BJ493Q type diesel engine crankshafts.

According to the result of comparison test,microalloy steel(49MnVS3)is choosen as a material of diesel engine crankshaft and gains huge economic benefit through its gradual application in batch production.

Throughout the course of the study,measuring the impact of nip,measurement method,common measurement of the phenomenon and solutions,are an important part of the study in the management of nip of production safety measure is also an important part,to improve the life of diesel engine crankshaft.

Based on the principle of linear clastic fracture mechanics and the method of photoelastic test, an analysis as well as experimental investigation on 3-D stress state and mechanical parameters under fracture of the crankshaft of model 6160A diesel engine have been made for the purpose of the prediction of the safety.

Through analysis of the technical problem encountered during the pouring of Babbitt layer for high-powered low-speed marine diesel engine bearing shell and of common defects,as well as the research of pouring technique and distortion rule of Babbitt layer,the centrifugal pouring technique is improved and optimized.

This paper studies concept,calculation and gauge design concerned with coaxality of main spindle hole and camshaft hole and points out some common errors.