post #16 of Old 07-13-2014, 01:05 PM
zjosh93
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1993 ZJ 
 
Join Date: Aug 2010
Location: Austin
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Ouch. Those end studs see a good bit of force from the differential heating of the very long steel header flange. I broke that rear one tightening it the first time I had the header off. I was able to drill into it with a short drill bit on a 90 degree drill head and pull it out with a straight fluted screw extractor. I replaced both studs after that.

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post #17 of Old 07-15-2014, 10:14 AM
Professur
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1992 YJ Wrangler 
 
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Quote:
Originally Posted by Technohead View Post
Talk is cheap. Prove it. No pictures. No happen
Sure thing ... I'll run right out and find a ZJ so I can bust a manifold bolt off it because I feel such a great need to prove myself. Or maybe not. How about I just use google?

http://books.google.ca/books?id=2UbG...emoval&f=false

Or if that's too much reading ...


https://www.youtube.com/watch?v=IFSA0r6JpM8

Proof enough?
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post #18 of Old 07-16-2014, 03:16 PM Thread Starter
pwoodbury1
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1995 ZJ 
 
Join Date: Aug 2013
Location: Pittsburgh
Posts: 6
Huh. Way cool. Cronaweld 333. Well, that was way beyond the capacity of these guys. Horizontal busted bolt too, not vertical. Thanks for the links....I'll remember this going forward.
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post #19 of Old 07-16-2014, 05:07 PM
jeepjeepster
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My gosh!!! Almost $1000?!?! They broke the bolt?!

What did they do to get it out??

1994 ZJ-I6 w/216,000 mi
1998 ZJ 5.9 w/65,155 mi Slate Black
2004 KJ w/90,300 mi
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post #20 of Old 07-16-2014, 06:21 PM
Professur
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It can be done with common rods too. The 333 is just a particularly specialized rod for the technique. I run a brushful of anti-splatter gel into any threads exposed to serve the same purpose as the 333's fancy flux. Horizontal makes no difference with a quick freezing rod. The whole thing works because as the heat sinks down the restant it makes it expand. It wants to expand in all directions, but it can't because it's width is constrained by the walls, making all expansion go lengthwise. Then it cools and shrinks ... but it shrinks in all directions ... leaving a piece that's now slightly longer, and slightly skinnier than before. The added materiel and welded on nut are little more than a handle at this point. Run a thread chaser or tap down the hole to clean up any distortions and you're back in business. A practiced hand at it can clear the hole in under 10 minutes.

I will say, I've never attempted this on an aluminium head.
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post #21 of Old 07-16-2014, 06:50 PM
ozzy_2_me
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Location: Lansing
Posts: 387
personally, think pepboy's should have paid to have it extracted or bought you a new head.
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post #22 of Old 07-16-2014, 06:58 PM
KoolAidMan888
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2000 TJ Wrangler 
 
Join Date: Jul 2012
Location: Ashford
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Quote:
Originally Posted by ozzy_2_me View Post
personally, think pepboy's should have paid to have it extracted or bought you a new head.

Aerospace CNC tube bending.
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