Bolt Removal Extraction Kits

[Banshee]

Guys if you've been following the updates from my Cavalier Project Thread you'll know that I've managed to snap a mild steel exhaust manifold stud in the ally head of my EcoTec which I've been told is a very common occurrence.

I'm going to buy a extraction kit to do it by I'm overwhelmed by the choice and different types

What's the difference between this one;
http://www.screwfix.com/p/trend-pro-...questid=310291

and this one;
http://www.screwfix.com/p/screw-extr...iece-set/18643

Which is the best set for this job?

Or can somebody link me to something better?

[solarman216]

The big problem with all of these tapered extraction devices is they expand what is left of the stud once you have drilled it so making it tighter than it was, most are for all practical purposes useless, one of the best is the parallel shaft with 3 or 4 sharp vanes running the length of the shaft, you drill a hole the same diameter as the shaft and hammer it in, the sharp vanes cut into the stud and with a bit of heat on Ali it will come out easy, the next best is set a set of left hand drills, progressively, drill out the stud, usually when you get near to base size of the thread it just unscrews while you are drilling, incidentally cellulose thinners is a good release agent between Ali and steel, Rick

[Banshee]

Originally Posted by solarman216

The big problem with all of these tapered extraction devices is they expand what is left of the stud once you have drilled it so making it tighter than it was, most are for all practical purposes useless, one of the best is the parallel shaft with 3 or 4 sharp vanes running the length of the shaft, you drill a hole the same diameter as the shaft and hammer it in, the sharp vanes cut into the stud and with a bit of heat on Ali it will come out easy, the next best is set a set of left hand drills, progressively, drill out the stud, usually when you get near to base size of the thread it just unscrews while you are drilling, incidentally cellulose thinners is a good release agent between Ali and steel, Rick

Have you got a link to a decent set Rick?

[Banshee]

I've just purchased a set of cobalt left handed drill bits, I'll need a pilot hole anyway to use an extraction kit, hopefully when the left handed bit bites it will spin the stud out

[Mobieus_uk]

don't worry if it all goes wrong, as long as the stud is out you can oversize the hole and use a helicoil kit, they come in all sizes and are great for restoring a knackered thread

[Banshee]

Originally Posted by Mobieus_uk

don't worry if it all goes wrong, as long as the stud is out you can oversize the hole and use a helicoil kit, they come in all sizes and are great for restoring a knackered thread

Watched a video of that last night too, looks like a decent bit of kit