Re: [DML] Re: advice on stubborn bolt

[DMCVIN6683 <dmcvin6683@xxxxxxxxx>]

This is why i now use Left Hand Drill bits to remove broken studs.

Left Hand Drill bits are used in the reverse speed of the drill like 
what you would use to remove the stud under normal circumstances. With 
a normal drill bit you are tightening the broken bolt as you are 
drilling into it with heat, with a Left Hand Drill bit you might get 
lucky and have the broken stud back out as you are drilling into it.

This procedure has worked very well on my broken manifold stud.

Good luck.

Mark V


On Mar 1, 2006, at 1:47 PM, David Teitelbaum wrote:

> Breaking off a drill, tap, or extractor is probably the worst thing
> you can do. With that being said there is still hope. Sometimes you
> can get lucky with a small hammer and centerpunch. Try working the
> extractor back and forth. If you can move it even a little then there
> is a good chance you can get it out. If it won't move at all then you
> have to try drilling it out. It is possible (with a lot of luck and
> experience) to drill it with a carbide bit like as used to drill
> concrete). You have to go a little at a time and constanly redress the
> tip. You can also buy a titanium drill bit, again very difficult to do
> and stay centered but will hold an edge longer but you need a special
> grinding wheel to redress it. Another option is to lay a washer over
> the mess and try to weld a nut to the broken bolt. Then, if all goes
> well, you just unscrew the whole mess right out! A lot depends on the
> skill of the person and his personal experience with each method. If
> you are a novice machinest maybe the thing to do is to have the car
> towed to the shop. Try to talk them into an "appointment" so it won't
> stay in their shop in their way. Do not be tempted to skip it and hope
> it won't leak much without the bolt. It will.
> David Teitelbaum
> vin 10757
>
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