How to purposely break off a weldnut?

[capri_auto]

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]

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_]

Die grinder, dremel, or cold chisel.

 

[MikeinNH67]

Usually a big hammer and chisel does the job.

 

[Surf13]

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

 

[sharpie223]

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]

Thanks will try a punch and BFH.

 

[capri_auto]

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.