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[omega3000]

Almost half the bolts have shered off trying to get heat sheilds off 
No way of getting them out so what is the preferred method of re securing 

[Diamond Black Geezer]

Well as per my post a few minutes before I haver the same issue, so I shall follow this thread with interest, should mine get no replies! 

My idea (and I'm waiting on others' opinions) is to drill out the threads, insert small bolts from inside the car (NO idea where they would come out, I'm guessing underneath a seat or somewhere equally inaccessible) use one nut to hold the bolt to the car, then another to hold the shield in place. 

[Kevin Wood]

I would drill out the hole and fit a rivnut.

[omega3000]

Sorry i meant to add that these bolts are for the heat sheilds above the exhaust .. took them
off to gain access to handbrake mechs .  Do the sheilds really need
to go back on 

[Diamond Black Geezer]

At the risk of stating the obvious, car companies tend not to fit things unless they have to for cost/servicing/lengevity/safety/sales reasons, or a blend of all... If they spend money fitting them, then they're probably required.

Last night I found one heat shield was slightly stuck to the stone chip underbody protection, clearly it had been touching, and slightly melted the paint. So I'm guessing they can/do get reasonably warm. So the metal of the floorpan will be able to take the heat, but perhaps the paint won't?

[Webby the Bear]

Personally wouldnt want to remove the heat shields steve.

are you able to drill 'em out and retap the holes? (have a tap n die set if needed)

[Marks DTM Calib]

Drill out and fit a nut insert

[omega3000]

Personally wouldnt want to remove the heat shields steve.

are you able to drill 'em out and retap the holes? (have a tap n die set if needed)

No mate , dont have any tap n die sets  Always been a bit worried about leaving the shields off , just haven't had the capabilities to put back on 

[05omegav6]

The threads that the nuts screw onto are welded to the outside of the floo, not through it...

Self tappers with a smear of sealant or use rivnuts, again with a smear of sealant before fittin the heat shields

[robson]

Are rivnuts a combination of a rivet and a nut how do they work.

[omega3000]

This what you mean ? Where would you get them from and what size 



Or these ?

[Diamond Black Geezer]

The threads that the nuts screw onto are welded to the outside of the floo, not through it...

Self tappers with a smear of sealant or use rivnuts, again with a smear of sealant before fittin the heat shields

Oh, that's interesting... so actually if I were to drill 'through' the thread, which normally would be very tough steel, is actually gong to be going through let's say 1mm of floorpan? That's good news, then. 

[Kevin Wood]

This is the best place, IMHO...

http://www.memfast.co.uk/

But you can get cheap kits of a few fasteners of each size and a tool that would do the job for a one-off:

http://www.amazon.co.uk/Silverline-633942-Threaded-Rivet-Insert/dp/B000WTJPLO

The mandrels on the cheap tools are very easily broken so be careful when using them to keep the mandrel at 90 degrees to the panel.

[omega3000]

Would they not pop rivet on  Reason i ask is i have a new pop r gun 

Ah scrap that idea , if i pop them will be hard to get the shields off again 

[Kevin Wood]

Would they not pop rivet on 

Yes, but then you have to drill the rivet out and renew it every time you have to remove the panel.