Cracked Exhaust Manifold

FWB in SK · Nov 24, 2020

Have a Farmall H with cracked exhaust manifold. Still on tractor. Will JB weld work to fix or is there another product
that can be used..

Crazy Horse · Nov 24, 2020

Temporarily patch? Maybe. Fix ........ I'd say definitely not.

Old560 · Nov 24, 2020

Been there done that doesn’t work. Go to Napa they make a special putty that has worked for me but I don’t remember the name of it.

Richard G. · Nov 24, 2020

Check the price here on this site at the top of the forums.
I would just buy one before I would patch one on a tractor that gets used.
Manifolds expand and contract a bunch and JB would not last that long.
Richard in NW SC

rusty6 · Nov 24, 2020

The only thing I have found to fix a cracked or broken exhaust manifold is replacement with a better one. Welding was hopeless and I didn't even try JB weld although I'll use it on almost anything. I've got one cracked and broken on a six cylinder IH truck that needs fixing too.

Bspauld · Nov 24, 2020

I have brazed broken manifolds up successfully. They have to be off the tractor,

teddy52food · Nov 24, 2020

I have welded one with 10018 low hydrogen that held up ok.

FWB in SK · Nov 24, 2020

Some one tried to weld it before. Did a very poor job. Was hoping there would be something out there that would work.

GordoSD · Nov 24, 2020

Member on here with handle of "Old" has 4 non running H's. He might sell you one.

Blackhole49 · Nov 24, 2020

I've had very good luck brazing them.

David G · Nov 24, 2020

Much, much easier to replace, find a used one.

NY 986 · Nov 24, 2020

Unless a very small crack JB weld would be a very short term solution. Plenty of used H parts out there including manifolds. Start checking Ebay among other online sources.

gab · Nov 24, 2020

Too bad your not next door to Illinois, I got a pretty decent one I've been going to put on Craig's list.

SHALER · Nov 24, 2020

Since I beleive we have established the route to go is replacement as other manifolds are readily available, therefore I will attempt to hijack this thread.....what is the purpose of the "cut" that bisects the bolt holes on Gab's pictured manifold?

teddy52food · Nov 24, 2020

Expansion.

old · Nov 24, 2020

Intake an exhaust expand at different rates so the cuts are there to make it so the manifold doesn't break it self apart. Intake area always runs cooler so the 2 have to have way to relieve stress

george md · Nov 24, 2020

When you get done with all magic fixes , get out the torch and

the cast iron rod (cast iron in stick form )and the proper flux

and repair it properly.

george

<p align="center">

Showing back of the broken heater box</p>

<p align="center">

assembled box , back side</p>
more of the manifold repair

Stephen Newell · Nov 24, 2020

No epoxy will stand the heat. A manifold is usually made out of junk metal so it's unlikely it could be nickel welded. The safest fix would be to braze it. Still even if you fix it I would be searching for a replacement.

jimg.allentown · Nov 24, 2020

That isn't a cut. It is the separation between the intake and exhaust manifolds. That is actually TWO manifolds attached to each other - the intake and the exhaust. On most inline engines, they can be separated and replaced individually.

T.R.K. · Nov 24, 2020

Hey! I think that is my old manifold!. George fixed it for me something like 12 or 15 years ago. He did a great job and it worked fine and I was able to save the old Moline JTU.

Kelvin in NC.

big jt · Nov 24, 2020

Upper left hand corner of the screen you are looking at right now!!

You will spend more time and money trying to fix what you have than a new one costs. That is unless you have something that isn't available new.

jt
New manifold

FWB in SK · Nov 24, 2020

They don't ship to Canada. Don't no why...

george md · Nov 24, 2020

Yes Kelvin ,it is your manifold . When it got here I had several

fellows that knew I fixed manifolds tell me that is no way to do it.

Famous last words.

george

george md · Nov 24, 2020

Stephen,

Most manifolds are good cast iron . The only one that gave me any

trouble was one for an IH 444 , weld did not want to flow.

george

Cracked Exhaust Manifold

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