Assembly of stainless steel piston rod components

The stainless steel piston rod should be carefully selected and checked before assembly, otherwise it will increase the difficulty of assembly and affect the quality of repair. Check the quality difference of piston and connecting rod. For the same multi-cylinder diesel engine, the quality difference of each piston should not exceed 10g; the quality difference of connecting rod should not exceed 20g; the quality difference of piston connecting rod assembly should not exceed 30g.

Clean and dry the piston and cylinder liner, apply a layer of clean oil on their respective working surfaces, stand the cylinder liner upright, with the top of the piston facing down, and place the cylinder liner smoothly with the right hand. If the piston falls slowly, it means that the clearance between the piston and the cylinder liner is well matched; if it cannot fall, the clearance is too tight; if it falls too fast, it means that the clearance is too large.

Selection and inspection of stainless steel piston rod edge clearance and ring groove. Put the piston rod into the ring groove, it can rotate freely in the ring groove, and can sink into the bottom of the ring groove, and its edge clearance is between 15mm. The gap is too large. Check the end face clearance Put each piston rod 40mm away from the upper end of the cylinder liner in stages, insert the end face clearance with a thickness gauge for measurement, and measure whether the ring clearance meets the size required by the machine manual.

Selection of piston pin and connecting rod bushing Wash and dry the piston pin and bushing, apply a layer of clean oil on their respective working surfaces, then hold the place near the small end of the connecting rod with the right hand, and then use the left hand to hold the piston Put the pin into the bushing properly, and it is advisable to push the piston pin into the bushing slowly with the force of the right thumb. If the push is too tight and laborious, the bushing needs to be scraped; if the push is too loose, it must be re-selected, the piston pin is enlarged or the bushing is replaced.

The matching of connecting rod bearing bush and connecting rod journal shall be scraped on the working surface of the bearing bush, and the uniformity of small points shall reach more than 75%. The tightening torque of the connecting rod bolt shall reach the specified standard. Push to turn is appropriate. When installing the stainless steel piston rod, pay attention to the direction and sequence.

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