Welding the crank can be a temporary fix if you're not a very good welder but if you get the crank properly remanufactured then you'll find there are specialists that can repair the keyway quite successfully and permanently. Whilst general welding is not rocket science, it does require some understanding of metallurgy to effect a good repair. If the section under repair is highly stressed then No, your weld will probably not have the shear strength to cope, but the keyway for the harmonic balancer is not highly stressed in regards to shear forces, it is a locating point and also is an interference fit to some degree. The reason it chops out in the first place is from the bolt coming loose. Loctite should be use to secure the balancer nut to prevent it coming loose and allowing the balancer to move and chopity chop the keyway. If the keyway was supposed to cope with all the torque then it would be on a splined shaft. do some googling for crankshaft repairs/repairers... you might find the fix cheaper than first thought.



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