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Tractor Talk Discussion Forum

exhaust pipe installation

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western Iowa

01-10-2005 18:01:31




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I am putting in a new exhaust pipe in the manifold, and am thinking of running the tractor to heat up the manifold before screwing in the exhaust pipe. Would the heat expand the manifold some so as I can screw the pipe in further? Or should I get some of that exhaust pipe sealant and put it on the threads of the pipe and screw it in that way. I have cleaned the threads with a 2'tap and the pipe goes in about half way. I do want it to be tight and not have to weld around the bottom to keep it tight. Thank you for any advise and information.

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RustyFarmall

01-11-2005 04:51:24




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 Re: exhaust pipe installation in reply to western Iowa, 01-10-2005 18:01:31  
I would not use any type of sealant, just screw it in as far as it will go, use the tractor, and then retighten the pipe. Check it a few more times after you have run the tractor, eventually you will not be able to tighten it any more.



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Gene Davis (GA)

01-10-2005 20:02:32




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 Re: exhaust pipe installation in reply to western Iowa, 01-10-2005 18:01:31  
If you warm the manifold and screw it further down, you may run a risk of when it cools down of cracking the cast iron that the manifold is made of. When you screw the pipe in further than the normal taper it acte as a wedge and expands against the outer threads. The taper is the same on the inside and outside threads, I have found that a good way to handle exhaust pipe threads loosening is to clean the threads on both pieces with a tap and die if needed. I then install a steel,(not cast aluminum) conduit lock nut that will split when tightened),with the concave side towards the manifold. Then after coating the threads with a good grade of high temperature anti-sieze compound I screw the pipe in tight. Be careful so that you don't break the cast iron manifold. When the pipe is screwed as far as it is possible with normal pipe wrench (not a 5' cheater pipe) I then lock the conduit nut against the manifold. WORDS OF CAUTION!!!!! HAMMERS WILL DESTROY CAST IRON!!!! I have had very good sucess with this method. Gene Davis

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37 chirf

01-10-2005 19:59:13




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 Re: exhaust pipe installation in reply to western Iowa, 01-10-2005 18:01:31  
Since pipe threads are tapered be careful not to make it too tight, or you run the risk of splitting the manifold. Stan



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Mark - IN.

01-10-2005 19:25:13




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 Re: exhaust pipe installation in reply to western Iowa, 01-10-2005 18:01:31  
Well, heating the manifold will certainly expand it, but might also expand inward as well. Harrold's right, threads are tapered and will go just so far before reaching stopping point. I'm thinking, and could be wrong, but if put into a hot manifold, will tighten sooner because expanded inward, and will loosen when cools. Give it a try. If loosens after cools, tighten it cool.

Mark.



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NC Wayne

01-10-2005 19:20:44




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 Re: exhaust pipe installation in reply to western Iowa, 01-10-2005 18:01:31  
Like Harold said, pipe threads are tapered so it's not unusual for a pipe to only go in half way before it gets tight. Since exhaust manifolds can get hot to the tune of 500 degres plus I don't think any kind of teflon tape or pipe dope would even begin to have a chance at those temps, besides with nothing but exhaust going through it at basically zero pressure you wouldn't need any kind of sealant anyway. After the two pieces are screwed together and run a few times and get hot and then a little moisture in them and eventually a little rust and exhaust crud your biggest concern is going to be ever getting them apart. So instead of a sealer give it a good dose of hi-temp antisieze compound. This will lubricate and reduce friction between the threads allowing you to get at least a litle tighter in the beginning, and make it ALOT easier to take apart in the future should you ever need to. Just my .02

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Mike (WA)

01-11-2005 08:23:40




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 Re: exhaust pipe installation in reply to NC Wayne, 01-10-2005 19:20:44  
Guess I've fought with too many exhaust systems over the years. While reading his post, I wasn't trying to think of more ways to get it tight, but counting the different methods he proposed to install it such that it could never be removed without destroying the manifold. My goal is to get it just tight enough so it doesn't flop around, 'cause "what you put together today, you're gonna have to take apart tomorrow". The anti-sieze is a great idea.

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harold schwartz

01-10-2005 19:11:11




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 Re: exhaust pipe installation in reply to western Iowa, 01-10-2005 18:01:31  
PIPE THREADS ARE TAPERED, SO PIPE ONLY GOING IN HALF WAY IS OK. USE PIPE DOPE IF YOU WANT TO SEAL GOOD



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