Based on the working demands of mate parts, this paper designs the mate precision of mate parts, suitable assembly method and the working precision of corresponding parts.

Ceramic plunger couples have been favored by engine designers for their excellent properties such as wear resistance,corrosion resistance and so on,but their use have been severely restricted because of their complicated technics and machining.

In order to use engineering ceramics to make plunger couples instead of metal,stress and displacement distributions for plunger couples made of different materials were studied under the engine rated power,and the change regulations of clearance were analyzed.

With experimental method, the efferts of the surface process technology of hard counterpart on the operating performances of sealing systems are studied and revealed.

Analysis of inspection means for three big precision coupling of fuel supply system in diesel engine;

This paper expounds mainly wear features of several key precision coupling of fuel supply system in automobile diesel engine during repairment of automobile.

By SEM,micro analysis,tolerance dimension and surface roughness measuring of precision coupling,and atomization performance test of injection nozzle,the failure cause of the precision coupling of a diesel engine,the plunger matching parts,delivery valve and injection nozzle matching parts was investigated.

Use the Water Base Cleaning Process,Improve Cleanliness of Plunger and Barrel Assembly;

The most important factor that causes plunger matching parts failure of injection pump on the high pump end was analyzed in this paper,and the necessary tests was done.

By analyzing the sealing and lubrication of the plunger matching parts of the fuel injection pump with the oil film theory and gap liquid flow theory, a basic theory and the analytic method are proposed to set the smallest gap between the plunger matching parts.