Posted by mkirsch on December 31, 2013 at 05:02:52 from (65.199.189.6):
In Reply to: Using a fire wrench? posted by Kellyc on December 29, 2013 at 15:04:55:
Methods to free up frozen bolts are like... well, you know. Everyone has one.
You can heat the clamp or you can heat the bolt. In this case the clamp will be more effective because the heat has a looooooong way to travel down the bolt to reach the threads. It would be hard to maintain the heat long enough without melting the bolt.
If you can get some penetrating oil down into the bolt hole from the backside after you heat it that would be good. First off it cools the bolt and shocks it loose from the clamp. Second off some of the lube gets drawn down into the threads which doesn't hurt your chances.
When you heat the clamp, you want to turn the bolt while the clamp is still hot. It's all about thermal expansion. The clamp has expanded away from the bolt.
When you heat the bolt, you want to wait until the bolt cools. First off the hot bolt is soft and will twist off. Second off the hot bolt is expanded and tighter in the hole than before. The expanding bolt "stretches" the cast clamp slightly when it expands.
That's just for future reference. Heating the bolt won't work well here because the head is so far from the clamp.
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