How to purposely break off a weldnut? - Toyota 4Runner Forum

capri_auto · 05-16-2019, 10:09 PM

I drilled out some broken skid plate bolts in order to retap. I butchered one on the trans skid. I drilled through the side of it somehow. Its the front, driver side, weldnut on the trans skid and there is a nice access hole right next to it. I want to break the whole weld nut off and install an M10 rivnut in its place. Any tips on how to break it off? I dont have an airhammer.

CJFONNER · 05-16-2019, 10:36 PM

Once it’s drilled out a few strategic blows with hammer and punch should do the trick. Aim for where the welded nut makes contact with the frame. It should pop off pretty easily. I did the same with M8 rivnuts a couple years ago. Been holding up fine since...

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_chassis_ · 05-16-2019, 10:41 PM

Die grinder, dremel, or cold chisel.

MikeinNH67 · 05-17-2019, 04:29 PM

Usually a big hammer and chisel does the job.

Surf13 · 05-17-2019, 04:36 PM

I used a hammer and punch a couple of weeks back. Takes a couple of minutes, but works fine.

sharpie223 · 05-17-2019, 07:38 PM

My first choice would be a Dremel with a thin grinding bit, less likely to gouge out excess material than a full grinder. If there's no room for that, a cold chisel and hammer, aimed to work its way under an unwelded seam if there is one. If that fails, try a bigger hammer until it works

capri_auto · 05-17-2019, 09:22 PM

Thanks will try a punch and BFH.

capri_auto · 05-20-2019, 06:07 PM

I ended up knocking 4 of the weldnuts out with a punch and hammer. The ones on the radiator support took a lot of persuasion bit I got them all out and put m8 rivnuts in using the bolt and nut method. Replaced the bolts with grade 8 flange bolts and applied anti seize. Good as new and all the bolts are the same now. Pain in the ass factor was high.... end result was worth it.

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