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#1
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How do you remove exhaust studs ??
Anybody out there know a trick or two about how you remove
old exhaust studs from cast iron heads ? The heads are 906 casting big blocks and the studs are soft and stuck in the heads. 1 was already broken off when I got them and I broke one as I thought it was working loose after using wd40 and working the stud back and forth. Snapped off when I went just a little to far. I have heard you take a torch and heat either the studs or the heads!! I would think if you did this you would heat the head not the stud. Anyway this doesn't sound like the best idea but!! Anybody with any tricks that you can letl me know would be greatly appreciated. PS: I do have a oxy/acet settup so heating is not a problem but since it would be uneven heat on the heads I would like to avoid this method if possible. Also the heads are currently bare and have just come back form being hot tanked if it makes any difference. Thanks in advance for any help. |
#2
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The technique I'm familiar with involves heating the head around the stud, then cooling the stud with an ice cube. Causes the stud to shrink and the head to expand. Not sure how well it really works, though. Sounds like you've got nothing to lose by trying.
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#3
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If they're that stuck, the heating method is probably the only way you're gonna get them out. There are some pretty serious penetrating oils that work better than WD40, try Kroil... if that doesn't work then the torch is gonna be it. Either that or bust 'em off and then drill them out. Be sure to use a small enough drill that you don't hurt the threads if you decide to go with this method, and use a tap that is the same size as the studs to clean up the hole after. This is a last resort method though!
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#4
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I've always achieved good results by heating the stud until it starts to glow, then let it cool down completely on its own, then simply unscrew the stud with vicegrips or a very small pipe wrench.
By heating the stud it expands, and breaks the bond of rust at the threads. |
#5
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Thanks for the Help.
Thanks alot for the ideas.
The studs are not frozen in place, I just suspect a large quantity of rust on the inside threads where they protrud into the water jacket. I will look for the kroil and hope that works if not then I'll try heating the studs prior to the last of heating the heads. Hopefully 1 of the items will work. Again thanks alot. |
#6
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I HAVE HAD GOOD LUCK REMOVING STUDS BROKEN OFF FLUSH,BY DRILLING THEM OUT WITH A REVERSIBLE DRILL AND A REVERSE DRILL BIT,(COUNTER CLOCKWISE).SOMETIMES THEY WILL SCREW OUT WITH THE BIT,HEAT EM FIRST.
GOOD LUCK |
#7
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PB blaster. much better than wd40 for freeing such things as bolts broken off in heads..
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#8
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Well the first thing is to have the correct tool. Get a stud remover tool that grips on the threads. Snap On sells a nice one but I'm sure you can find other vendors also. The best ones use collets that grip the thread tightly without damaging it. Once you have the correct tool they come right out. Sometimes a little heat helps. On really bad ones you can heat them up and melt a little wax down the threads.
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#9
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studs
having removed a ton of these I can tell you they very seldom come out without breaking! but one way to try first is rap it sharply on the end with a big hammer, but not so you smash the end, then try it with vise-grips, if they are gonna come out without breaking they will , normally, they are already broken and you just drill them out, when you put new ones in, BE SURE TO USE A SEALER, OR TEFLON TAPE, OR NEVR-SEIZE, otherwise they will rust up again.
by the way, hitting it with a hammer causes vibrations that generally will loosen the rust and scale, and free it up. |
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