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Post by BeatUpRupp on Nov 25, 2014 17:31:09 GMT -6
While the engine is out I'd like to take the exhaust completely off to try and get things sealed up a little better. One of the ex tubes is definitely leaking where it meets the cylinder. What's the best way to get those suckers out? Pipe wrench? I tried a little to turn them out but figured I'd stop and ask the pros before I break something
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Post by ruppluver on Nov 25, 2014 18:40:46 GMT -6
The threaded ones, can be a bugger to get out,even with a pipe wrench. If I can't unscrew them,I leave them in,don't want to bust the jug!! Hopefully you have the engine shroud off. I have never tried heat either.Have fun.
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Post by BeatUpRupp on Nov 25, 2014 19:26:14 GMT -6
Yep, I have the shroud off. I sucked a bit of plastic from the seat in there so I wanted to take it off to clean things out then noticed that one is leaking. Just getting the exhaust to let loose of those tubes was a real good time too. I may just leave it be the way it is if the PB blaster I soaked it in doesn't do the trick. Breaking a jug is not in my future
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Post by ruppluver on Nov 25, 2014 20:00:42 GMT -6
I usually heat the exhaust pipe to get them off the tubes.They can be stubborn also. I seal everything,if I can get it apart.If not,seal the stuff I can get off & call it a day. You could try tapping on the end of tube,but ever so gently,sometimes that could help break them loose!
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Post by BeatUpRupp on Nov 26, 2014 11:13:49 GMT -6
I'll give some heat and a light tap a try. What do you recommend sealing the exhaust up with, hight temp rtv?
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Post by ruppluver on Nov 26, 2014 12:53:57 GMT -6
hight temp rtv? YES,that's what I use,find the highest temp stuff you can buy.When I seal,I take carb cleaner & spray the pieces where the sealant goes. Sometimes once sealing works,sometimes it takes a couple of times.I usually check the exhaust throughout the winter.If its leaking,but not too bad,I'll re-do it in the summertime. Sometimes after heating,you can squirt some PB on the threads,it could work its way into the jug some. Just be careful.This MIGHT not be the way to do it,BUT no one else has chimed in on this.
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Post by mrmotors on Nov 26, 2014 19:06:05 GMT -6
Getting steel out of aluminum can be challenging, especially exhaust pipes that are corroded and carbon locked in place. I wouldn't get excited about heating it up, you can heat it at least up to normal operating temp which is probably 200° +.
Give the stub couple of good solid whacks without deforming it or driving it into the jug. That will usually loosen the crud up on them. Soak the thing with penetrating oil again and then heat it up. Try not the heat the exhaust tube directly as it will expand also. Keep the heat on the aluminum. When you have it hot enough to suit you, see if the pipe will unscrew. You have to be careful about the thing packing up on you then there will be a problem. I dont know if its a straight or tapered thread, I would suspect straight from the pics I've seen of them.
If you get it out, have your machine shop buddy thread you up a new one maybe just a bit larger. You can make diagonal cuts across the threads of the original piece and use it as a thread chaser.
If all that works and you get the thing out and don't wanna make a new one, just make sure the threads are clean on both pieces before you try to put it back. Throw the stub in the freezer overnight and heat the cylinder up again before you screw it back in. I would say you could use Permatex #3 as a thread sealer for this.
If your concerned about crushing the tube with a tool while trying to unscrew it, tap a piece of round bar into it so when you grab it to turn it the tube won't crush. Of course, leave enough of the bar sticking out that you have a way to remove it if the exhaust stub won't come out.
I've dug a lot of things out of aluminum, be patient and take your time otherwise it can get ugly fast. Hope this is of some help.
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Post by drrupp on Nov 28, 2014 9:05:01 GMT -6
If the stub is tight you may want to leave it most of the time you wreck the threads in the cylinder screwing it out.
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Post by BeatUpRupp on Nov 28, 2014 12:41:24 GMT -6
Thanks for the advice guys! I still haven't got back to giving it another shot with all of the Thanksgiving family stuff going on. Hopefully I'll make it out to the garage this afternoon.
I know what a pain it can be to remove Al from steel. The skid I picked up to swap into my Nitro had aluminum mounting shafts through the steel torque arm. Seized solid. Even after several days of PB, heat and pouding they wouldn't budge. Finally rigged up a jig in the press to give it a hail mary shot. All that did was destroy the torque arm. That aluminum shaft never moved at all. Had to grab a new torque arm and made up a new shaft.
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Post by BeatUpRupp on Nov 29, 2014 12:39:57 GMT -6
SUCCESS!! After sitting for a few days the PB must have done it's job. I unscrewed them BY HAND. Here are a couple of pics. Threads looked great I hope I got these lined up to get the rest of the exhaust back on! I should have put it all together at once ... but I didn't since it was 2am here when I got to this point.
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