exhaust stack rubbing on intake stack

[vinceo]

Actually it looks like Hartzell Aviation owns the business now.
https://hartzellaviation.com/

[6643]

Hmm... Lots of links but it's all a little sketchy. This was the correct contact info 15 years ago...

There's a link on the facebook page, but I recommend you not click on it. It gets re-routed. I'm not a facebook member, so I can't see the whole thing.

https://www.facebook.com/p/Dawley-Aviat ... 769533987/

When in doubt, get a copy of Trade-a-Plane and look through it for ads by exhaust repair shops...

[vinceo]

Looks like Hartzell Aerospace welding is the correct link. But it all
looks super high level promotion, I wonder it they would even consider
working on a old 140 exhaust? Will have to probe this.

https://hartzellaerospacewelding.com/

[4004]

Suggest you call one or both of the take- over companies and discuss your problem, possibly with the picure of the crack. Ask for an estimate - worse case. Both had excellant rep. over the years. As Ray said the word use to be "ship to Dawleys". I had good service with AWI -"we can repair it as long as we can reuse 1" of the old"- straight piece of stock came back.

Problem is with a buy-out the prices typically increase considerably. I would be somewhat "blunt, tactfully" and just ask with the buy-out are your prices reasonably the same as you've been told. If one is a lower level, he may share something with you

It looks to me like, if one cleaned up the crack and closed the crack and welded with the proper alloy, you would get the desired spacing.

The root cause of any previous repair may be that lots of welders don't understand the metal alloys and use auto rod which is stainless steel based rather than aircraft exhaust rod which is "inconel" meaning that it is nickel based! Just my experience over the years. If you could find a local welder that understands the situation, may be a quick fix.
Suggest you check the N.O. area for welders - call welding material suppliers and see if they stock inconel welding rod and who do they sell it to. 2c

PS I'd cross the shroud situation when it happens.

[6597]

Try these folks here on the left coast....

https://knisleyexhaust.com/contact-us

[6643]

"we can repair it as long as we can reuse 1" of the old"

The joke we (not necessarily "they") had about Dawley is they could cut the flanges off the old exhaust and use them as the basis for a "repair" by replacing all the tubing. Then they would cut the old flanges off and "repair" the new exhaust with new flanges.

Maybe an illusion, but it looks like the top part of the stack is already at an angle before you get to the break. It should come straight down, perpendicular to the exhaust port, until it is past the intake elbow.

[vinceo]

Thanks all for the insight. In looking at the stack I am not al all sure there is a crack.
Until I remove it and get a 100% view the answer should manifest. I have been sick
the last 3 weeks with sinus and lung congestion. Its been unseasonably warm here
in North Louisiana and combined with damp weather and decaying leaves its a warm
soup of fungus layered into the environment. A visit to Dr. has helped and I should be
back on my feet next week.

There is a fellow here with a set of stacks and I may follow him up on those if the one
in question on my aircraft is too problematic. We shall see.
Thanks again for all the insight here.