RE: [DML] Need to extract a broken bolt.

["Joseph Kuchan" <josephkuchan@xxxxxxxxxxx>]

Since extractors are so hard you can forget about drilling them out. Its 
best to NOT use extractors at all, unless everything else has been tried and 
failed. Extractors, being so hard. are also very brittle and they very often 
break.

Two options possible options:

1. Arc weld something to the end of the stud. Then *pulse* the welder 
repeatedly to heat the oxides/gunk that is binding it to the piece its stuck 
in. This can burn away the bad stuff and loosen the bolt. (Disconnect 
eletronics in the vehicle before you do this to reduce the possibility of 
frying something.)

2. Some machine shops have electric spark discharge disintegrators that can 
literally "eat" a broken stud right out of a hole.

Also, talk to your closest engine rebuilding shop. They deal with this kind 
of problem frequently and may be your best local resource.

-Joe


>From: "therealdmcvegas" <dmcvegas@xxxxxxx>
>Reply-To: dmcnews@xxxxxxxxxxxxxxx
>To: dmcnews@xxxxxxxxxxxxxxx
>Subject: [DML] Need to extract a broken bolt.
>Date: Sun, 15 Aug 2004 18:46:55 -0000
>
>>
>Fast Forward. While replacing the flange gaskets on the water pump
>bypass, one of the new bolts that I was screwing in (grade 8.8 btw),
>snapped it's head. And then while attempting to extract the bolt with
>a bolt extractor, the extractor broke off in the bolt. So in a word,
>this sucks. I've tried taking cobalt drill bits to it, and that has
>not done a thing, except dull the bits.
>



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