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farmall M manifold

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720diesel

04-27-2007 21:37:34

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I have a 48 farmall m with a cracked manifold. The exhaust part is cracked on the backside down the middle, not too wide of a crack but 4 inches long.What would be the better approach, braze it or weld it? And if I were to do either, would preheating be a good idea?Or if I were to weld it, what would be the best rod number? This tractor will only run a bush hog a few times a year. I also have a prolem with gas draining out of the weep hole in the bottom of the carburator after you shut the tractor off. Is this incorrect setting of the float?Thanks!!

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DNWELDMAN

04-28-2007 12:23:55

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Re: farmall M manifold in reply to 720diesel, 04-27-2007 21:37:34

Yeah you can weld it. It's cast iron, mig won't work. The rod you want is called "Nickel 99". This is a rod that does not require preheating. Normaly preheating is needed for cast iron. Get it in 3/32" size and run about 90-95 Amps. Make sure it's at least 1/8-5/32" thick to stick weld it. If it's only about 1/16" thick your better off brazing it. Doug

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JayWalt

04-27-2007 23:00:08

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Re: farmall M manifold in reply to 720diesel, 04-27-2007 21:37:34

they sell special rod for cast iron at your local hardware/welding supply store. Dont know a number, but the ones I used said they were specifically for cast iron and they worked real well.

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georgeky

04-27-2007 21:49:03

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Re: farmall M manifold in reply to 720diesel, 04-27-2007 21:37:34

You can weld it, and yes it should be preheated. I don't know the rod number, but your supplier should. I would check that float setting. The float setting is 1" 5/16ths.

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Patrick Martin

04-27-2007 23:40:47

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Re: farmall M manifold in reply to georgeky, 04-27-2007 21:49:03

Any decent rod will work. The only thing that has bearing here is that the surface is prepped and preheated.

You need to use a dremel or angle grinder and dig into the crack following it and grinding a V channel in it. Not deep enough to go through but deep enough to fill nearly half of the thickness of the manifold.

With your acetelyne torch in one hand and wender in the other, preheat the crack till it turns a dull red. Once this temp is acquired, lay your weld into the crack and stitch the crack up while keeping the torch just ahead of your work to maintain the heat. Once finished let it cool slow. Works 100%

If you are afraid that the crack will grow with the expansion of preheat then take a 1/8" drill and drill into each end of te crack. This will eliminate the fault.

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Patrick Martin

04-27-2007 23:44:02

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Re: farmall M manifold in reply to Patrick Martin, 04-27-2007 23:40:47

You can use a MIG too if you have one. A MIG makes it easy to do this but I prefer a stick myself.

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