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Exhaust repair 1" NPT


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#1 John Arsenault ONLINE  

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Posted June 04, 2016 - 07:44 AM

Anyone ever repair a stripped exhaust port on a cast iron briggs or tecky? 

 

I am looking at a tractor and the owner told be he JB welded the exhaust on because the threads are stripped.

 

 

 


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#2 LilysDad ONLINE  

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Posted June 04, 2016 - 07:51 AM

Have you tried tapping it deeper? Pipe threads are tapered.


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#3 olcowhand ONLINE  

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Posted June 04, 2016 - 08:04 AM

Plus many times the threads appear worn when in reality they are just bummed up with carbon and rust. Get a tap and clean the threads. You may get by with an easy fix. But be sure the pipe doesn't go in too far. You may have to cut off a bit of it's end.
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#4 John Arsenault ONLINE  

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Posted June 04, 2016 - 08:04 AM

Just thinking about the tractor at the moment, so far just looked up helicoil inserts and the kits....oh oh wow the 1 inch stuff is pricey. The inserts are not that bad but to do it right looks like I'll be needing a kit so that I have the tool to insert the inserts.

 

Maybe I should have asked has anyone done this kind of repair a little more affordable?  and what process did you take? 


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#5 WrenchinOnIt OFFLINE  

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Posted June 04, 2016 - 08:56 AM

This stuff worked superbly , it's on a Wisconsin , but IMO cast iron is cast iron, if you want to scroll thru this post there are some pics


http://gardentractor...the-mail-posts/
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#6 glgrumpy ONLINE  

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Posted June 04, 2016 - 10:15 AM

I did the tap thing on a Kohler once. As noted, the threads were bad at outer area, good way back.  The tap cleans the outer threads and engages the inner, but don't allow much to cut. It gets tight fast, and bet good pull would break the block, seeing it is weak from the rust out. I went in dry and wet after. Borrowed the tap, as you say very pricey other wise. I also used good sealant on the fitting I put in and the fitting went in deeper then too. I had to use a lock ring off conduit fitting so I could position the elbow in correct spot and have it hold. Those are important if not coming straight out.


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#7 KC9KAS OFFLINE  

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Posted June 04, 2016 - 07:03 PM

Just thinking about the tractor at the moment, so far just looked up helicoil inserts and the kits....oh oh wow the 1 inch stuff is pricey. The inserts are not that bad but to do it right looks like I'll be needing a kit so that I have the tool to insert the inserts.

 

Maybe I should have asked has anyone done this kind of repair a little more affordable?  and what process did you take? 

I have never seen a "Heli-Coil" for a pipe thread....Is there such a thing?

I have cleaned out the threads many times with a tap. As stated above, after you clean the threads, you may need to cut a couple of threads off the end of the pipe before you thread it into the jug.


Edited by KC9KAS, June 05, 2016 - 07:51 AM.


#8 John Arsenault ONLINE  

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Posted June 04, 2016 - 09:24 PM

I have never seen a "Heli-Coil" for a pipe thread....Is there such a thing?

HI have cleaned out the threads many times with a tap. As stated above, after you clean the threads, you may need to cut a couple of threads off the end of the pipe before you thread it into the jug.

http://chrislynninse...n-p-t/inserts/ 



#9 olcowhand ONLINE  

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Posted June 04, 2016 - 09:44 PM

HERE is a working link to the kit.


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#10 KC9KAS OFFLINE  

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Posted June 05, 2016 - 07:53 AM

HERE is a working link to the kit.

I guess I learned something today!!



#11 John Arsenault ONLINE  

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Posted June 05, 2016 - 08:05 AM

Look at that I am teaching you old dogs something and I have only been into tractors for about a year. 

 

Heli coils are pricey but I figured with so many exhaust being stripped people would have least known about these. 

 

I have done a bit of research and I am not scared to buy an engine with a stripped port  because it can be fixed right ..I hate the idea of rigging something or something fixed just enough to get by , meanwhile we know its a ticking time bomb.

 

I have also seen a guy cut the end of the pipe and flare it out and that seems like it will hold if there is enough threads.


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#12 LilysDad ONLINE  

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Posted June 05, 2016 - 08:25 AM

Some Kohlers came with a bolted flange instead of threads. If the threads were stripped, the bolts could be drilled and tapped.


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