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Massey Harris & Massey Ferguson Tractors Discussion Forum
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MH 44 exhaust manifold question

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Robin Mach

12-05-2004 21:53:19




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I've got a '52 44RC gas. It looks like there are internal threads in the top of the exhaust manifold where the stack/muffler goes. Does any one know what size thread this is? I'm guessing it's not quite the same as the 2" water pipe that a previous owner tried to install by hammering it in. Is there some sort of adapter used to get from the manifold to a muffler, can you get mufflers with threads on them, etc.?

Sorry for all the questions, but now that I own the silly thing I'm gonna at least try to take care of it.

Thanks,

Robin

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Fred Kobs

12-08-2004 04:38:13




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 Re: MH 44 exhaust manifold question in reply to Robin Mach, 12-05-2004 21:53:19  
Robin,just wanted to add that i made a thread chaser of sorts out of the extra pipe nipple. used a SHARP hacksaw and cut accross the threads in 4 spots. if your manifold threads aren't too bad this will clean them up a little.fred



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Hey Fred

12-08-2004 07:05:11




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 Re: MH 44 exhaust manifold question in reply to Fred Kobs, 12-08-2004 04:38:13  
Isn't it fun, to be resourceful, building your own fix-the-problem tools? You make your needed
chaser, while someone is driving to the store to buy one? By the time they return with their purchase your manifold is is intact. I've cut
grooves in odd size bolts, to clean rust/debris from old bolt bosses, a little PB blaster, job
complete, and my 'tool' boxed with the previous
'fabrications'. Nice idea you suggested.

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Fred Kobs

12-08-2004 19:29:55




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 Re: MH 44 exhaust manifold question in reply to Hey Fred, 12-08-2004 07:05:11  
yep...i think it started with my uncle making threads on a spindle of some sort out in the field. my favorite is the emery wheel for cleaning small bores like u joint yokes w/a headless 3/8" bolt in the cordless w/slot sawed down shank to the depth of emery cloth of course i'm getting cheaper by the day in my old age...if i can make it with resourses on hand, time is free here



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Robin Mach

12-07-2004 10:08:39




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 Re: MH 44 exhaust manifold question in reply to Robin Mach, 12-05-2004 21:53:19  
Thanks to all who replied. I do appreciate it.



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Al M

12-07-2004 00:11:52




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 Re: MH 44 exhaust manifold question in reply to Robin Mach, 12-05-2004 21:53:19  
The exhaust manifold is tapped for 2" NPS pipe, commonly used in steam or industrial service. 2" NPS pipe is exactly 2 3/8" O.D. A 6" or 8" long pipe nipple, schedule 40, will provide years of service as it is 0.154" in wall thickness, as opposed to the typical muffler tubing of 0.050" thickness. This is probably the easiest & cheapest repair on the whole MH44 if the threads on the manifold are still in good shape. A pipe nipple as discribed can be supplied by any industrial supply house for less than $10. To duplicate the factory part, get an 8" nipple (nipples are usually threaded both ends) and cut off one threaded end so that the overall length is about 6". Mufflers for 2 3/8 tubing are readily available. Screw the threaded end of the nipple into the manifold, slip the mufler over the cut end, u-clamp, and you're ready to go. If the manifold is otherwise sound, but the threads are in poor shape, the threads can often be chased with a pipe tap, as pipe threads are tapered. The pipe nipple will just sit a little deeper in the manifold. Check with a machine shop, who could also supply the pipe nipple & cut it off for you. A final tip -coat the threads with a nickel-based antiseize compound and tighten (with a pipe wrench) about a half turn to one turn past hand tight.

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Harris Guy

12-06-2004 08:47:05




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 Re: MH 44 exhaust manifold question in reply to Robin Mach, 12-05-2004 21:53:19  
The pipe is threaded, and is 'about' 2 3/8" O.D.
Two decades ago, some welding repair, on a cracked manifold may have modified the size, to
less, for ease of repair time/expense. Finding
scrap tube or pipe, at a welder's scrap pile,
may get you some pieces that you can sleeve back
up, to the muffler size, 2 3/8".



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