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Farmall & IHC Tractors Discussion Forum
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Farmall 140 Exhaust Manifold

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ChrisNC140

09-05-2007 10:48:35




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My 140's muffler does not thread into the top of the exhaust manifold. The pipe extension is smaller than the manifold's opening, so it just rests on the manifold itself. My worry with this is, aside from moving back and forth, is that I am not getting proper back pressure. Im worried about damaging the valves or seals. The manifold is fairly rusted, so the threads may be gone. Any info on a parts supplier would be good too.

Any info would help. Thanks. Chris

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TheDurk

09-06-2007 23:35:55




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 Re: Farmall 140 Exhaust Manifold in reply to ChrisNC140, 09-05-2007 10:48:35  
After many years mowing under trees the pipe threads in my manifold were shot. I bought a universal flange at NAPA which bolts onto the ears of the manifold, added an extension onto the flange and a NAPA universal truck muffler. That was twenty years ago and it works great. The ears on the manifold were not part of the factory exhaust setup, but they are just sitting there waiting for you to use them. (Mine is a 1966).

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ddg

09-06-2007 05:37:30




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 Re: Farmall 140 Exhaust Manifold in reply to ChrisNC140, 09-05-2007 10:48:35  
the manifold & extension on my SA were "grown" or rusted together too. I hack sawed it off about 1/8" above where it threads into the manifold. From there, I took a punch, and tapped inward until I got some of it broke loose from the threads in several places. I let it soak overnight with penetrating oil, but still couldn't twist it out. I finally got out the torch, and heated the pipe part up enough to peel it out of there. The pipe was thin enough to quickly get red hot & soft, without heating the manifold enough to bother it.

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Hugh MacKay

09-05-2007 15:50:43




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 Re: Farmall 140 Exhaust Manifold in reply to ChrisNC140, 09-05-2007 10:48:35  
Chris: Your biggest danger if tractor sits outside in the rain, about half the water that hits the hood follows right down the pipe and into the engine. Probably 100 times as much water as if you had a tight mufler and pipe with nothing over it. It's all about square inches of rain collected. If you have to leave it out in the rain, pull the mufler and pipe, and put a can over the manifold.

I once had a Farmall 300 with pipe and manifold threads bad. In a 4" rainfall the hood collected enough water to fill a cylinder, plus the manifold. With a tight exhaust I've seen the 300 sit in an open field with nothing over the exhaust, and next to no water went in.

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chadd

09-05-2007 11:27:54




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 Re: Farmall 140 Exhaust Manifold in reply to ChrisNC140, 09-05-2007 10:48:35  
Do you mean that the manifold extension pipe doesn't thread into the manifold? I have never seen or heard of a muffler that would screw directly into the manifold. The pipe that screws into the manifold is something like 1 3/8 inch water pipe (don't quote me on the diameter), nothing special about it. You can find used manifolds at antique tractor shows and swap meets, and new ones are probably available on this site, worthington ag parts, or any other large parts supplier. I wouldn't even begin to worry about the lack of backpressure damaging the valves. Our M ran for 2 or 3 years with cracks through the manifold until we found a cheap replacement. I'd worry more about water or foreign objects and critters getting in the motor through the gap. Many of the old farmalls were run without mufflers back in the day with the thought that it gave a little more horsepower.

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ChrisNC140

09-05-2007 11:44:56




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 Re: Farmall 140 Exhaust Manifold in reply to chadd, 09-05-2007 11:27:54  
Yes, I meant the extension pipe, not the muffler itself. Thanks for the info. I will get a new piece of water pipe and keep my eyes open for an exhaust manifold. Ive got it under shelter now, so water isnt a problem, just need to keep the bugs and things out. Thanks.



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