Re: Snapped Studs
 

It looks like those screws were stainless steel. If you do put stainless fasteners into alum alloy, use a suitable anti-seize compound, either an aluminium based version or preferably a nickel type like this especially in a hot application like exhaust studs.


Good luck getting them out. I think apart from trying some good penetrating fluid (Plusgas or similar, WD40 isn't good enough) and tapping the end with a light hammer, plus some heat, and repeat, the only option will be progressive drilling out. Used a good sharp drill bit too, if it isn't cutting freely it isn't sharp, even in A4 stainless.


For an M8x1.25 fastener the thread core size is about 6.8mm. I'd try starting at about 3mm drill and work up towards 6mm.

Re: Snapped Studs
 

for getting penetrating fluid into up hill bolts mould some clay/putty and make a trough around the bolt with an opening at the top high enough so the fluid when creeping will get to the end of the bolt. make sure you get a good seal with the clay/putty.

as embee says tapping the end with a nail punch helps loosen off the oxidisation around the thread.

Re: Snapped Studs
 

Did you just use a hand drill when you drilled them out? My neighbour has suggested welding on an extension as an option to save any hassle. Unfortunately I didn't fit these bolts so not sure what the are or why they have no anti seize on them. I got myself some reverse drill bits in the event of drilling them out.

Re: Snapped Studs
 

What part am I heating with blow torch? The bolt or around the bolt?

Re: Snapped Studs
 

All fixed :)http://i366.photobucket.com/albums/o...417_135831.jpg

Re: Snapped Studs
 

Well done. :salut:

How did you deal with it in the end?

Re: Snapped Studs
 

Drilled them out and re tapped. Fitted stainless studs and bolts with anti seize compound, so hopefully no issues in the future!