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Old 09-27-2021, 11:23 AM   #1
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Exhaust / welding question?

Our exhaust has a hole and is in need of repair. If they will be welding on the exhaust what electronics do i need to disconnect, if any, to keep them from being damaged?

Thanks
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Old 09-27-2021, 11:26 AM   #2
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Arc welding , disconnect both battery banks completely ( + & -) and Allison says to disconnect their ECM too ; even with battery banks disconnected.

Gas welding not an issue .
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Old 09-27-2021, 01:53 PM   #3
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Might be a lot easier and wiser to just pull it off the coach to weld it.
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Old 09-27-2021, 02:04 PM   #4
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I believe they will be TIG welding. I will find out 100% for sure before any work is done.


The shop doesn't have the capability to raise a DP to prefab the exhaust.

Thanks again
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Old 09-27-2021, 03:40 PM   #5
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I turn the two battery disconnect switches off and then disconnect the ground cables on both the house and chassis batteries.
Then just make sure they attach the TIG ground as close to the place they are welding as possible.

Disconnecting the Allison and Cummins ECU is not an easy task. The Allison ECU is on the basement ceiling, but it's covered with one of the gray felt plywood covers. The engine ECU is on the side of the engine but is tough to disconnect.
As long as they properly ground the TIG everything will be fine.
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Old 09-27-2021, 05:15 PM   #6
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I wouldn't want to tig on the coach with the hi-feq on. Even for start only.
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Old 09-27-2021, 10:24 PM   #7
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Most places will MIG an exhaust.
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Old 09-28-2021, 10:12 AM   #8
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ZMotorsports has been posting updates on his coach for several years. He also has a YouTube channel.
Mike's a true craftsman!
Post #1388 he talks about welding on the exhaust.

"No, I did not disconnect my ECM or my TCM. I merely turned my chassis and house power disconnects off. The key is to make absolutely certain that the welder ground clamp is placed directly next to and on the component to clean bare metal. You don't want the amperage to have to "seek" out a ground."
https://www.irv2.com/forums/f115/mod...37276-100.html
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Old 09-28-2021, 03:27 PM   #9
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Thanks Vito.

I've read most of Mike's posts and he is awesome, and you've helped me a lot, whether you know it or not, as well.

As we are having the exhaust welded and not on the frame I plan on taking the same precautions and don't expect any problems.

Thanks again
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Old 09-28-2021, 03:32 PM   #10
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With a cracked exhaust manifold, I would be SHOCKED if it could be successfully welded in place.


Cracks in manifolds are usually 360 degrees.


Remove it and weld if you must.


Replace is a better option.


Been there, done that.
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Old 09-29-2021, 01:16 PM   #11
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Sorry for the confusion. It's the exhaust pipe, NOT the manifold. They are going to cut a section out and fabricate and install a new section.
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Old 09-29-2021, 01:24 PM   #12
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Cut it back and section in a new pipe using high quality band clamps to the flex pipe. No welding required. That is S.O.P. in most truck shops.
Anytime you can avoid welding on any modern chassis it's a win win.
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Old 09-30-2021, 07:50 AM   #13
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With an exhaust pipe as shown in picture, it appears to be removable so welding on the coach should not be an issue. If you can cut out the bad section and replace with a section with wide band clamps at each end all the better.
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Old 09-30-2021, 08:21 AM   #14
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1. As stated by others I would try and repair in place with no welding, cut off the rott with a Sawzall and then use something similar to this to splice with some pipe.

https://www.ebay.com/itm/5-ID-to-5-O...-/173732383409

then use some HD band clamps as seen on your flex pipe to couple.

2. Pull that rotted existing pipe off and you can buy the large exhaust pipe bends from you local real truck parts supplier.......copy build it ...and re-install.


Happy Trails
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