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Be very careful.
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Posted by RayF (more from RayF) on Tue, 7 Jul 2015 16:36:19 Share Post by Email
In Reply to: Re: Theromostat housing bolts - stuck!, ccb056 [Profile/Gallery] , Tue, 7 Jul 2015 16:17:51
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I'd be a little worried about an impact wrench because there's no stopping it from twisting the neck of the bolt instead of loosening it.

There's a lot of corrosion that fills the threads and locks the bolts in.

If you have a 3/8" breaker bar I'd use that, with a short section of pipe on it to let you give it more torque and yet control it. If those bolts are flange-headed it will be better (I can't recall) because you can pound on the breaker bar right at the end and have the shock transfer all the way down the threads.

Pound AS you apply strong twist, so you're twisting at your max just when the hammer hits. That often gets tough screws started.

And if you have one of those old fashioned impact drivers you could try that.

If you get any motion, then apply more oil or penetrant and TIGHTEN the bolt again, going back and forth over the little motion you have. This helps work oil down in and break the corrosion up. Lots of times if you keep turning against resistance, the bolt will break. Get little gains, applying oil and backing it up each time, till it really feels free.

I liked Bernie's note that one of the bolts comes all the way through and its projecting threads can be oiled.

Once they're out clean the threads up on a wire-brush wheel and oil them and run in and out a few times before putting it all back together. Even run a tap down the holes.



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