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Removing a Frozen Bolt with Heat
There is a stainless steel bolt (about 3/16 diam) that
is threaded into the center of the motor shaft in an old dishwasher that I am repairing. In order to remove the impeller and other parts for replacement, it was necessary to unscrew the bolt. Having no success, I ground the head off, thinking I could then liberally apply penetrating oil and eventually get the bolt out by turning it with a vice-grip. Despite numerous oil applications and twisting to the breaking point, the bolt has refused to unscrew. It is very important that the bolt not break off, as it would be very difficult for me to redrill the hole concentrically. Would it be worth trying to heat the bolt with a propane torch? How should this be done, and what would the risks be? Would there be increased risk of shearing the bolt off after heating (assuming it still won't yield at the threads)? Your advice is appreciated. I will tell you that I do have a backup plan to extend the bolt length with a collar, but this is not optimal as it will require enlarging the center hole on the impeller and other problems. (This of course assumes the current bolt remains unbroken.) Thanks very much. (Don't hesitate to recommend the backup plan if you really feel that it's the best route.) Frank |
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