Tried with my impact wrench today and bolts still won't budge. I even hit it with a torch until the bushing caught on fire. Still struggling to get these things out. I've never had this much of a problem with bolts. I live in Arizona, so everything on the bottom sids rust free.
"I even hit it with a torch until the bushing caught on fire. " I think we've all done that!
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I have had decent success with the extractors and penetrating oil folks above described.
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I have used a grinder and cut nuts off the backside and hammered the bolts thru, effective on leaf spring bushing bolts bolt likely not available to your predicament.
In my worst rounded bolt scenario, nothing above worked.. I took a "too small deep well socket, drilled a 3/16" (if I remember correctly) hole thru the side, hammered the socket on the round bolt head, it went about 2/3rd of the way.. I then drilled a hole in the bolt head and put in a screw.. I really thought it was gonna work.. then the screw snapped.
So of course I was frustrated
, Out comes the stick welder, I welded the socket to the bolt, let it cool, flooded with more penetrating oil, beat on it with a hammer to make sure the weld was good and shock it somewhat, or maybe just to calm myself, heated the (female threads) on the backside with a propane torch, used a 2 foot cheater pipe on my breaker bar and out it finally came.
It took all day, but I was so proud
, I only ruined 1 socket and this 30 minute job only took 2 days to complete.
My better than I deserve wife "somehow sensed" my frustration and never came to the garage to ask how I was doing
If that doesn't work, I would consider grinding / cutting the flange of the bolts off, drop the bracket and bushing down then with the increased exposed surface area weld to it to get more leverage to remove it, If that still doesn't work, cut it off, drill & tap a new hole for new bolt(s).
I grew up on a horse farm, I pride myself on doing almost everything myself.. but as I get older I might consider writing a check to a shop.. That all said, no dishonor in knowing you are beat or don't have all the tools necessary and writing a check to save your sanity / marriage.