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Will JB Weld work on an exhaust manifold?

A

Anonymous-0

Well-known Member
I have a Minnappolis Moline U that has a cracked exhaust manifold, I took it to a weld shop and they were unable to weld it,they did heat it first. So now I am thinking epoxy. What is the best kind to use, JB Weld is good to 600F, how hot do think an exhaust manifold on a tractor gets? Thanks
 
If I had to go that route I would want to use something like QuickSteel or
ThermoSteel that are rated for 2400F. I can't vouch that they'll work on your
application though. One Example
 
If the hole ain't too big, you might be able to patch it together with furnace cement. Aint pretty, but it works, sometimes!
 
Get ahold of Wendel Everett get a new one stock one.
6771 EVERETT VALLEY RD SE
Gnadenhutten, Ohio 44629
614-922-3335
Really knows Minnnie's, resonable on price too. Worth driving if you can his place is amazing. Mike
 
no epoxy will hold. I would look for a good used one. Or just get a new one.you said the repair shop heated the manifold and welded it. depending were it was cracked and were they heated it. theres a good chance its warped now.
 
(quoted from post at 16:59:39 03/18/13) 1200 to 1300 degrees. A welding shop should have been able to braze your manifold. Find another welding shop.
Loren, the Acg.
Click to expand...

Will the brass withstand that temperature without melting?
 
I agree with Case Guy , have it brazed. Yes it will hold up to the heat and brass is somewhat flexable also. You can tie knots in a brazing rod. Have him use a die grinder with a thin cut-off disc on it to cut some "grip grooves" past the hole or crack. I have brazed carb flange bolt holes back on and used this method and you can tighten them right down with no sign of breaking. Also you can grind it to shape and use a welding ""needle scaler" to put the rough cast texture back in the smooth ground spots so it will look exactly like the cast around it.
 

Unless you have some magic type of cast, I have
not had a manifold that I could not weld . My
guess is they tried it with an arc weld rod,
and that is probably the worst choice. Brazing
is a better choice , but will sometimes let go
due to the heating and cooling as the two do
not expand and contract at the same rate. Best
to weld with torch and cast iron in stick form.
The o/a weld becomes part of the base material
and is the same material therefore expands and
contracts at the same rate.

You get it here and I will repair it. Below
are some photos of before and after and also
a link to more photos.

george

<p align="center">
Imported%20from%20qu100_4615_jpgqu.jpg
</p>

<p align="center">
Imported%20from%20qu100_4631_jpgqu.jpg
</p>
more photos of repair
 
How do you even save these things.? That is a bad wammer jammer of a repair job.What did you do metal spray ? Oh I forgot to click on more photos .Cool!
 

All done with torch , cast iron rod and flux.

Some parts the are missing get replacement

cast .

Send me an email with a phone # ,if you want

to chat about it.

george
 
I wouldn't trust brazing on an exhaust manifold. It
if got too hot and you had to try and fix it again,
forget it. Brazing is good up to about 800 deg's and
it's common for an exhaust manifold to get a lot
hotter than that.
 
I used "Mighty Putty" on the exhaust manifold of a Farmall Super C. It's still there, and it's been a couple years anyway.

It was intended to be a temporary repair while I looked for a good replacement but it hasn't fallen out so I haven't really done much on that front.

I would recommend the JB SteelStik if you're trying to patch over large holes. That's similar to what the Mighty Putty was.
 
(quoted from post at 08:46:26 03/19/13)
All done with torch , cast iron rod and flux.

Some parts the are missing get replacement

cast .

Send me an email with a phone # ,if you want

to chat about it.

George
Click to expand...
George, can you weld an engine block and have it be water tight? my brother has a low hour 5.9 cummins out of his 1996 White tractor that cracked in the water jacket the full length of the block (factory defect). he has replaced the engine, just wondering if it could be fixed. thanks, Chuck
 

Chuck,

I think lacing plugs would probably be
a better repair. I had used the iron tite
plugs for years , but recently have used the
plugs from lock n stitch and what a difference,
much better and easier to use. They also tend
to pull the crack together rather than wedge
it apart.


george
 
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