The article’s primary purpose is to give a technological assessment of the process of manufacturing complex-shaped parts by means of powder metallurgy. The process is considered in the example of a complex-shaped product consisting of several elements manufactured separately from Fe-C-Cu powder mixture and then combined into a single structure. The joining was carried out by impregnation of porous structural elements with the fusion of copper-containing material. It has been demonstrated that the infiltration process is affected by many factors: porosity of structural elements, wettability of their pore hannels, fluid flowability of the infiltrating material and other factors. The research was carried out on the mass products - centrifugal pump stages for oil production. The elements compaction was carried out on hydraulic press at a pressure of 500 MPa, which ensured average density of the parts after sintering up to 7.8-8.4 g/cm3. During intering and impregnation, various types of defects of the pieces were detected, which were caused by the excessive thickness of the infiltrating material, different density of the walls and insufficient wettability in the connection zones of the elements. The investigations have shown that the method of manufacturing complex components by prefabricating single elements and their subsequent sintering combined with infiltration is feasible. It can be done in a chamber furnace as well as with belt sintering. However, it is necessary to prepare the mould thoroughly before sintering, choose the infiltrating agent carefully, and analyse possible disadvantages.