Broken bolt extraction tips!
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Broken bolt extraction tips!
Silly me! I decided to take a look at my thermostat.
Needless to say one of the thermostat housing bolts sheared.
So best way to get the remains out? MIG a nut on it and melt some wax over it seems to be the best solution.
I'd like to do this in situ if possible. I don't really want to take the carb and manifold off if possible.
(At least I discovered there was no thermostat...)
Needless to say one of the thermostat housing bolts sheared.
So best way to get the remains out? MIG a nut on it and melt some wax over it seems to be the best solution.
I'd like to do this in situ if possible. I don't really want to take the carb and manifold off if possible.
(At least I discovered there was no thermostat...)
- Ian Anderson
- Forum Contributor
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- Joined: Sun Nov 19, 2006 9:46 pm
- Location: Edinburgh
Re: Broken bolt extraction tips!
Easi out?
But if you have the welding kit welding on a nut will work. The heat from the welding will also assist in listening the stud
Ian
But if you have the welding kit welding on a nut will work. The heat from the welding will also assist in listening the stud
Ian
Owner of an "On the Road" GT40 Replica by DAX powered by 3.9Hotwre Efi, worked over by DJ Motors. EFi Working but still does some kangaroo at low revs (Damn the speed limits) In to paint shop 18/03/08.
Re: Broken bolt extraction tips!
You will have to get rid of that water before doing anything.
But yes, I would try to weld a nut to the remainder of the stud, and then tease it back and forth to try to free it.
Chris.
But yes, I would try to weld a nut to the remainder of the stud, and then tease it back and forth to try to free it.
Chris.
--
Series IIA 4.6 V8
R/R P38 4.6 V8
R/R L405 4.4 SDV8
Series IIA 4.6 V8
R/R P38 4.6 V8
R/R L405 4.4 SDV8
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- Forum Contributor
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- Joined: Sat Nov 18, 2006 6:22 pm
- Location: Northern Ireland
Re: Broken bolt extraction tips!
Clean it up and as there is a stub, try some penetrating fluid over many hours and maybe try some vise grips to get a feel if there is any chance of it moving even a slight bit in either direction.
If not, I'd say it will need proper heat. MIG'ing has been hit or miss for me, as usually it doesn't heat enough, and it's dificult to get a really strong weld to apply good torque to remove.
If not, I'd say it will need proper heat. MIG'ing has been hit or miss for me, as usually it doesn't heat enough, and it's dificult to get a really strong weld to apply good torque to remove.
Re: Broken bolt extraction tips!
Another vote for the nut welded on. And get yourself some ScotchClad 776, and use it on every thread that goes into ally. You'll never have one seize again. It's what Rover specified on the first RV8s, and it works now as then.
Dave
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
Re: Broken bolt extraction tips!
Clean it all up and apply penetrating oil for a couple of days. Apply vice grips to the stud and see if there is movement. Do not force as you do not want to strip that bit of stud. If it does not move apply a bit of heat to the stud - gently do it and do it enough get the heat down into the threads. Quench the stud with more penetrating oil or freeze solution. Heat again and use the vice grips to try remove.
No luck then weld on the nut etc.
No luck then weld on the nut etc.
Re: Broken bolt extraction tips!
Looks like thats called Scotch-weld fuel resistant coating. Will see about getting some. £72 a tin!
Tef-Gel also sounds good for use around cooling related parts as it's specifically for preventing gavlanic corosion in dissimilar metals. Used in marine applications.
Re: Broken bolt extraction tips!
Crikey. Last I bought, a few years ago, was about half that. But it is a litre, and lasts a long long time. Several complete engine builds. The 776 also acts as a thread lock. I'n sure there are alternatives - but have stuck with that because I know it works.rich112 wrote: ↑Thu Jul 29, 2021 8:14 amLooks like thats called Scotch-weld fuel resistant coating. Will see about getting some. £72 a tin!
Tef-Gel also sounds good for use around cooling related parts as it's specifically for preventing gavlanic corosion in dissimilar metals. Used in marine applications.
Dave
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
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- Top Dog
- Posts: 1278
- Joined: Mon May 04, 2009 6:53 am
Re: Broken bolt extraction tips!
Loctite 8009 will also work nicely there.
https://www.henkel-adhesives.com/us/en/ ... _8009.html
It's a formulation for Stainless fasteners, but will be good on mild steel as well.
https://www.henkel-adhesives.com/us/en/ ... _8009.html
It's a formulation for Stainless fasteners, but will be good on mild steel as well.
Cheers,
John
John
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- Forum Contributor
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- Location: Northern Ireland
Re: Broken bolt extraction tips!
Cheaper option is make a stud and nut, then hopefully the stud will never need to come out again. Plenty of anti-sieze around it anyway
Re: Broken bolt extraction tips!
Mission accomplished!
Took a couple of false starts to get a good enough weld onto the nut and the bolt, but then it came out. Not easily, but once I got it moving back and forth, applied some plusgas and carried on.
First time I've done this, so thanks for the tips!
Took a couple of false starts to get a good enough weld onto the nut and the bolt, but then it came out. Not easily, but once I got it moving back and forth, applied some plusgas and carried on.
First time I've done this, so thanks for the tips!
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- Forum Contributor
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- Joined: Sat Nov 18, 2006 6:22 pm
- Location: Northern Ireland
Re: Broken bolt extraction tips!
well done. it doesn't always work.
Re: Broken bolt extraction tips!
I was lucky, it was accessable! First weld didn't attach to the bolt, second didn't attach to the nut, but I was able to add more weld to the nut. Then I couldn't get a ring spanner over it... Had to grind some weld off! Was a bit of a palava, but a lot less than taking off the carb and manifold and drilling out the old bolt.