A precise machining technique called crankshaft grinding is used to repair worn or damaged crankpins and a crankshaft's primary journals. In order to repair taper, ovality, bearing marks, roughness, and other wear, a tiny quantity of metal is removed from the damaged surface during the grinding process. After that, the crankshaft is polished to the necessary dimensions and surface fin... https://www.connectingrodrepair.com/blog/crankshaft-grinding-crankshaft-repair-crankpin-grinding-ra-power-solutions/