Removing a Frozen Bolt with Heat

frank1492 · 2005-01-17T04:52:08+00:00

There is a stainless steel bolt (about 3/16 diam) thatis threaded into the center of the motor shaft in an olddishwasher that I am repairing. In order to remove theimpeller and other parts for replacement, it was necessaryto unscrew the bolt. Having no success, I ground the headoff, thinking I could then liberally apply penetrating oil andeventually get the bolt out by turning it with a vice-grip.Despite numerous oil applications and twisting to thebreaking point, the bolt has refused to unscrew. It is very important that the bolt not break off, as itwould be very difficult for me to redrill the hole concentrically. Would it be worth trying to heat the bolt with a propanetorch? How should this be done, and what would the risksbe? Would there be increased risk of shearing the bolt offafter heating (assuming it still won't yield at the threads)? Your advice is appreciated. I will tell you that I do havea backup plan to extend the bolt length with a collar, butthis is not optimal as it will require enlarging the center holeon the impeller and other problems. (This of course assumesthe current bolt remains unbroken.) Thanks very much. (Don't hesitate to recommend thebackup plan if you really feel that it's the best route.) Frank

Jan 17, 2005 22 Replies

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Edwin Pawlowski 21 years ago

Actually, we did help. By taking the time to post the problem, read the replies consider the options, you came up with a good solution. What is important is that it works. You did not rush and screw things up.

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Playintennis5274 21 years ago

you know if you heat it you'll have to replace the mechanical seal or carbon seal

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Duane Bozarth 21 years ago

Only if he were to heat it...

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