Diesel engine repair, in the replacement of the piston, piston pin at the same time, but also to replace the connecting rod bushing to ensure that their gear pump with a special liner matching requirements. General diesel engine connecting rod and piston pin with the gap of 0.005 ~ 0.02mm, so high DU boundary lubrication sleeve precision requirements, the general measuring tool is difficult to measure, in the repair process can be judged by experience. The piston pin with your fingers gently into the connecting rod copper sleeve, to both resistance, and no significant loosening is appropriate, piston pin and connecting rod bushing contact area of ​​75% or more.
(1) Replace the connecting rod bushings, must be stainless steel rolling bushing must first remove the old bushing, you can use pressure equipment and special tools for disassembly.
(2) After pressing the new connecting rod bushing, the bushing should be drilled according to the size and position of the oil hole of the connecting rod. Then, according to the outer diameter of the piston pin, The reamer of the connecting rod can be manually operated with the reamer, and the operation points are as follows:

① According to the piston pin diameter, use the appropriate active reamer, the reamer clip on the bench, and reamer and jaw plane perpendicular.
② the connecting rod sets in the reamer, the first hand will be the bulk of the head of the flat, the other hand to hold the small rod and down the light pressure, so that the reamer's knife-edge exposed bushing face 3 ~ 5mm is appropriate. If the knife edge exposed too much or too little, need to adjust the reamer nut.
③ reaming, the first hand holding the small head down the light pressure, the other hand will be the rod head flat, and even force the clockwise rotation of the connecting rod. When the bottom of the bushing and the bottom of the knife flush, stop the rotation, forced down the connecting rod small head, so that the connecting rod out of the reamer, so as not to hinge the ridge. In the reamer diameter of the same circumstances, the connecting rod to turn the direction of re-hinge once.
④ In the reaming process, should always use the piston pin with the test, to prevent the hinge. Each time the hinge should not be too large, generally make the reamer adjustment nut rotation 60 ° ~ 90 ° is appropriate.
⑤ When the hinge to the thumb with the piston pin can easily push into the bushing 1/3 ~ 1/2 parts, should stop the reaming. And then press the piston pin into the bushing, and clamped on the side of the pliers to rotate the connecting rod for grinding about 2min or so, and then remove the piston pin, according to the size of the contact area, the appropriate repair hinge or grinding. So repeated until the contact area and the gap are in line with technical requirements so far.