Engines with dry cylinder liners, such as cavitation pits (ie, honeycombed small pinholes) in the cylinder, not only cause cylinder bores to wear through, but can also affect dry cylinder liners, causing cavitation, resulting in cylinders. Leaking, the engine can't work. The traditional method of repairing the cavitation erosion of the cylinder block is cast iron welding, that is, casting 308 pure nickel cored cast iron electrodes with a diameter of 3mm, welding at a welding current of 90-100A, and then using a boring machine to cut the borehole of the cylinder sleeve to a standard. size. This method is not only a complicated and eclipsed method. The specific method is as follows: Pull out the old cylinder liner with a special puller, and use the micro air-driven grinding wheel to flatten and polish it to expose the new metal surface at the honeycomb hole corrosion area of ​​the cylinder bore hole of the cylinder block. Then, first flush with acetone or gasoline, dry the area with acetylene gas flame, and then you can perform the replenishment work. Adhesion can be used when the following methods: Method one: Take the amount of mixed evenly filled No. 2 agricultural machinery glue, smear in the pit erosion area (note that the amount should not be too much, otherwise it will make the liner deformation), and then the new cylinder liner pressure Into. Method 2: Mix 12-point or more cast iron powder with epoxy resin (in an amount of 10%-20% by weight of the resin), mix it thoroughly, and then apply it to the etched area.