Undertray Bolts Spinning

[Amos91]

Hi -
Currently the two rear bolts on my undertray just spin and cannot be removed due to the rivnuts? part of the subframe spinning.

I have absolutely no idea on this but is it possible to replace them?

Thanks

 

[Budgie]

Yeah, entirely possible.

I'd just sack off the undertray altogether though.

They never go back on any of my own cars. If there's a leak, i want to know about it.

 

[Amos91]

Yeah, entirely possible.

I'd just sack off the undertray altogether though.

They never go back on any of my own cars. If there's a leak, i want to know about it.

I know what you mean but I would probably like to keep it on (currently just have to bend it out the way).

Is it a case of angle grinding / drilling the bolt off and replacing the cup that's held in, or just go for a tack weld?

 

[Budgie]

Pretty much. I'd grind the top of the bolt head off and work out how to stop it spinning from there.

 

[da rok]

Drill out the old riv nuts and put new ones, you can get a tool to compress the new riv nuts, looks like a pop rivet gun, or ive used a vicegrip and a long bolt with a few washers before, anything that will hold the nut in place while you compress it

 

[Dan@SJM]

Pair of pliers will hold it and stop it spinning. Usually once undone they won't spin again.

 

[Amos91]

Pair of pliers will hold it and stop it spinning. Usually once undone they won't spin again.

I did try that but perhaps I was gripping the wrong bit as I wasn't paying too much attention. I'll give it another whirl, thanks for the tip.