Remove The Old Cylinder Liner of Cummins Diesel Generator Set

When the cylinder of Cummins diesel generator set can no longer be bored, or the conditions for cylinder boring are not met, replace or insert the cylinder liner. In most cases, the conditions for cylinder boring and cylinder grinding are not available. Therefore, when the wear degree of the cylinder of Cummins diesel generator set exceeds the technical conditions for use, the cylinder of diesel generator set is usually repaired by directly replacing or inserting the cylinder liner.

When the cylinder liner is inserted for the first time, the cylinder liner of standard size shall be selected to facilitate the multiple insertion and maintenance of Cummins diesel generator set in the future. The external surface roughness of Cummins diesel generator cylinder liner shall not exceed 0.8um, the cylindricity tolerance shall not exceed 0.02mm, and the lower outer edge of diesel generator cylinder liner shall have corresponding taper or chamfer. According to the outer diameter of the selected cylinder liner, bore the cylinder of the diesel generator set to the required repair size and appropriate surface roughness. The surface roughness of the bearing hole of the diesel generator set is required not to exceed 1.60um, and the cylindricity tolerance is not more than 0.01mm.

When the bore of the cylinder liner bearing of Cummins diesel generator group is enlarged and suitable cylinder liner cannot be selected, brush plating can be used to repair the outer wall of the cylinder liner. When brushing, nickel plating solution and copper plating solution can be used. When multi-layer electroplating is adopted, the coating thickness can reach 0.20 mm, which can meet the need of interference fit between cylinder liner and cylinder wall. When dismantling the old cylinder liner of the diesel generator set, tap the cylinder liner gently for inquiry and take it out with a special puller. If you don't have special tools, you can put the cylinder block of the diesel generator set on the side, put a hardwood pad on the lower end of the cylinder liner of Cummins diesel generator set, support the hardwood with a log or iron pipe, and knock out the cylinder liner with a hammer.

After removing the old cylinder liner of Cummins diesel generator set, scrape off the metal rust and dirt at the bearing hole of cylinder block, and polish the joint between cylinder block and cylinder liner with emery cloth. The surface roughness of the end face at the joint between the wet cylinder liner support shoulder and the cylinder block bearing hole of the diesel generator set shall not be greater than 1.60um, and there shall be no spot grooves. The cylindricity tolerance of the upper and lower bearing holes of the cylinder block of the diesel generator set shall not exceed 0.015 mm, and the fit clearance between the bearing hole and the cylinder shall be 0.05-0.15 mm. Before humidifying the cylinder liner of Cummins diesel generating set, a new rubber sealing ring coated with white paint shall be installed to prevent leakage. The pressing method is the same as installing a dry cylinder liner, while a wet cylinder liner is usually not polished due to its low pressure and unaffected inner diameter. If the roundness or cylindricity error of Cummins diesel generator cylinder liner is too large, pull out the cylinder liner, check and repair the corroded part of Cummins diesel generator bearing hole. The cylinder liner of Cummins diesel generator set rotates by 90 degrees and then is pressed in, but the sealing ring needs to be replaced.

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