Mating with

The step (stopping) finger with such an ovality of the working part (mating with the bearing of the upper head of the connecting rod) should not be allowed to further work, but it can be repaired by polishing the working part under conditions, which: it does not have fractures, cracks or corrosion; After grinding, the diameter of the working part of it will be no less than the diameter of the thinner end entering the hole in the piston; The hardness of the polished surface will be not lower than HRC — 55; In the conjugation of the ends of the finger (TRAPF) with the piston beans will be ensured by landing.