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Old 03-20-2012, 07:10 PM
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heli coil or next size?

When doing the exhaust on my '51 Chevy, both exhaust studs broke on the manifold.. pulled both intake and exhaust manifolds togther, and looked at the mess. Rust welded in, so I pulled the torch out, and tried heat/ chill with vice grips, but it almost made it worse. I decided to try blasting them out, which got about 1/2 way thru when it wouldn't go any deeper as it's only an oxy/mapp welding torch. I still have perfect holes to start a bit.. helicoil or 1 size up? or drill and use a bolt the right size from the top?

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Old 03-20-2012, 07:37 PM
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Heli-coil. Even better Keenserts . They are similar to heli-coils but get staked in place.
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Old 03-20-2012, 07:48 PM
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just a personal preference, but i have always liked helicoils. the other brands are fine too. the nice part is that you get a stainless thread, and i've never had one fail.
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Old 03-21-2012, 08:22 AM
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Quote:
Originally Posted by Blazin72
Heli-coil. Even better Keenserts . They are similar to heli-coils but get staked in place.
Looks like they are Metric only!
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Old 03-21-2012, 01:08 PM
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Quote:
Originally Posted by Blazin72
Heli-coil. Even better Keenserts . They are similar to heli-coils but get staked in place.
Helicoils also lock here's the proceedure:

http://www.youtube.com/watch?v=RFYa6sjhh_E

Bogie
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Old 03-21-2012, 01:17 PM
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I did this Helicoil a year ago, the heads are off right now and I see it held up just fine.

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Old 03-21-2012, 01:38 PM
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Matt - I believe you most likely have 3/8"-16 studs. The next size is then 7/16"-14 and that gets kinda big there. I would very seriously consider Helicoils or similar thread restorers. Of course, if you end up 'wallowing' that hole ....

Then there is the local machine shop to have them EDM that broken piece out.
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Old 03-21-2012, 03:44 PM
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I have a peice of the orig stud, and I think your right on the 3/8"-16. I shouldn't wallow out the hole, given that I can get right on it straight..

The only machine shop local is Napa, and I don't think they do EDM..


I think I'll go with the helicoil and see if I can make it work ok. I'v put them in before, a few times anyway... If it fails, I'll drop a peice of allthread down, and tighten it up from both sides.. Fentons are in it's future anyway
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Old 03-21-2012, 06:57 PM
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put a 1/4" Cobalt bit in and bored it right thru perfectly, so now I should be able to take it to the orig size with the correct bit and tap. if not, it's only a Helicoil away
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Old 03-21-2012, 07:05 PM
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if that doesnt work out, i would just use a bolt and nut
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Old 03-21-2012, 08:03 PM
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You could get some high temp loctite to set the stud of the heli-coil too if you want.

The thing I have with drilling the hole out to the next size or using a nut and bolt is that I like everything to be the same so if I replaced one stud with a bigger one or went to a nut and bolt then I'd do it to all of them.
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Old 03-21-2012, 09:58 PM
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Next time try some Kroil penetrating oil. I believe it too work after trying other oils. You have to let it set for a few days though.
Heli coil, its a pain in the rear doing exhaust work. Then having to switch tools in the middle becuase one bolt is different.
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Old 03-22-2012, 12:46 AM
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For future reference, an old hotrodder taught me this trick. Heat the broken stub to a dull red, then hold a candle to it. The wax will melt into the threads better than a penetrating oil.

Also for future reference, if there is any way to do it, impact can help a lot. If you have a frozen bolt, often times an impact wrench has a better chance of getting it freed up than just a hand wrench.

As far as the Heli-coil (or similar insert) is concerned: Any of the thread-in repair systems often end up being stronger than the original threads. The original threads in cast iron or aluminum are pretty soft. A repair thread is often steel of stainless and the resulting threads are usually stronger.
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Old 03-22-2012, 07:28 AM
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Yes, both studs will be repaired equally. As far as penetrating oil is concerned. The studs were actually corroded to 1/4 of there original diamater in the center. But I did try 50/50 Acetone and ATF for several days, but they were just too weak.. Didn't think about the candle, but I have done that before. I actually have graphite wax for snow skis which probably would have worked better too.
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Old 03-22-2012, 08:31 AM
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Quote:
Originally Posted by matt167
Yes, both studs will be repaired equally. As far as penetrating oil is concerned. The studs were actually corroded to 1/4 of there original diamater in the center. But I did try 50/50 Acetone and ATF for several days, but they were just too weak.. Didn't think about the candle, but I have done that before. I actually have graphite wax for snow skis which probably would have worked better too.
I think what you wanted to use is kerosene and trans fluid. The acetone has a high evaporation rate ,it likely evaporated with a few minutes. It might not of worked but I think I would try to drill the studs out at a smaller diameter then clean the threads with a tap. Never the less a heli coil will be stronger like all ready stated.
Again, try kroil on similar items. The stuff works great and no I am not getting paid. The company has been around for many years. I have tried every thing but kroil in the last 25 years. When I did my exhaust work on a 30 year old truck I did the kroil and all but one bolt came out easily, after setting in kroil for a few days. One gave me a little more of a hassle. I had to use some big vice grips and turn counter clock wise about 1/8 of a turn. Then turn clock wise 1/8 then again ccw a little more.
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