H Carb, RustyFarmall

GordoSD · Mar 31, 2011

Loren, do you know the difference between the two metering nozzles shown for the H? (45139 and 56610)Do you know how to tell which one you have if you have some in your hands?
Do you have a reliable method to remove one that has the "tips" or the slot basically gone?
I'm going to need just a few parts for this carb I'm doing as I have a shoebox of odd leftover H kits. So drop me a email private.

Gordo

rustyfarmall · Mar 31, 2011

(quoted from post at 08:00:02 03/31/11) Loren, do you know the difference between the two metering nozzles shown for the H? (45139 and 56610)Do you know how to tell which one you have if you have some in your hands?
Do you have a reliable method to remove one that has the "tips" or the slot basically gone?
I'm going to need just a few parts for this carb I'm doing as I have a shoebox of odd leftover H kits. So drop me a email private.

Gordo

The main metering stem is removed with a deep well socket. It has no tabs. If you are referring to the idle metering jet, the only way is to drill and re-tap the threads.

My email is open if you use the "modern" version.

pete 23 · Mar 31, 2011

Rusty Farmall, do you know the correct main jet size for a farmall 300 gasoline. Also, did they ever use the throttle shaft with a slot for the economizer circuit on that model. Friend of mine brought in a carb that had been worked over with some drill bits.Also has a brass plug inside bowl to economizer circuit. Can't remember if that is factory or not. I have a new jet for a 460 that I know is close but not sure exactly. I found a idle jet that is correct. I sure wish IH or somebody had a chart of all those carbs with the jet sizes, main jet, air bleed, nozzle tip size and the air bleed hole sizes and spacings etc. I have good manuals on the later tractors but not those below about a 656 or so.

D Slater · Mar 31, 2011

Pete if you don't find out, I have the information wrote down someplace. Do you have a carburetor #. Some of the 300 carbs. that were not for gasoline used the slot type throttle shaft and circuit. Don't think the R91 gas carburetors used the slot but would have to double check memory. Know the R92 models for gas didn't. Since a lot of different terms are used do you mean what IH called the main seat for the jet, or the nozzle holes or jet size?

GordoSD · Mar 31, 2011

Was talking about the removal of the idle nozzle. And you are right . I've done a couple and the only way I found was destroy and drill.
But I was talking main nozzles with the part numbers. I have a number of them and I can see several have larger holes. Whether that's factory or some pullers idea? The ones with smaller holes could be the "high altitude" tractor carb?

Farmall Bob · Mar 31, 2011

If you have the jets out, what I have done is to carefully apply pippers tape to the threads. It help make a better seal, and if for some reason you want to take tem back out for modifying the carburetor it makes for easy removal.
Bob

pete 23 · Mar 31, 2011

Slater, it is the driven in main jet with load adjusting screw that I am wondering what the correct size is. Some one drilled it out to about .090 in trying to get it to run better. Also drilled idle jet to .040 but I have another idle jet and a new load jet but it is for a 460, I think I have it marked .042 but haven't measured it yet. Darn parts book doesn't show size with part number, they do on the idle jet. Carb number is 361525R91 and does not have the slotted throttle shaft. No one really knows the history of the tractor but it was pretty much junk when present owner picked it up and has a friend of mine doing repairs on it. He put fire crater pistons in it and had head rebuilt and has been working on the dist to get timing correct. He calls me for suggestions until he gave up on the carb and brought in to me. I haven't heard it run but have a feeling I just may. Thanks.

rustyfarmall · Apr 1, 2011

I've never noticed any difference in the size of the holes on a NEW metering stem, whether it be for a gasoline only carb or for the distillate/kerosene carb. The stems I take OUT are a whole different story. Some have small holes just like a new one, and some have noticeably larger holes, but again, it doesn't seem to make any difference if it came out of a gas carb or a distillate carb, so I can only ASSUME the larger holes are the result of a modification made by a previous owner.

D Slater · Apr 1, 2011

May have a problem. The 361525R1 carburetors were not out to long before IH decided to change them to R92 specs. There was supposed to be enough change over kits sent to dealers to change all tractors sold with R91 carburetors to R92 sizes. Guess all didn't get changed though as once in a while a original R91 showes up. R91 carbs didn't use a high speed adjusting screw originaly, a special plug screwed in where the packing nut goes. Jet was supposed to be sized to work with no adjustment. Carburetor change over kits changed the jet and other mettering parts and added the highspeed adjusting screw. Don't have a original R91 carb to check at this time but I wrote the jet size as .051 for R91. R92 size as .048. Hope this doesn't confuse more than help. found some NOS carburetor change over kits for 400 tractors. Never found any for the 300. Think 300 kits did have a passage plug though, so maybe its changed and not marked.

pete 23 · Apr 1, 2011

Thanks for the information. This had to be before my time on the changes to carb although I am sure I repaired some of them over the years and didn't know about the updates. I started working for dealer in 58 so that would have been history by then. You mentioned marking the carb as changed, just how did they do that. I don't see any thing but wasn't looking either. One other thing I found curious was a slight grinding or fileing along side of the metering nozzle near the lower end. Can't see that would affect operation in any way though unless that was some kind of a code. I will do some more research on this.

D Slater · Apr 2, 2011

Think the change over kits contained a new tag and pin. Only reason I know about it, is that I most always notice any kind of changes to parts. If I don't know why I keep that information in back of mind until a answer pops up. Will try to post some more detailed info if I get it rounded up. I'm not very organized, will make a note working on a carburetor about the size of parts then forget were its at. Some carburetors will be all mixed up with parts after so many years have past. Found a few partial NOS change over kits in the past but never a complete one.
Probably the carburetor you have was changed if it has a passage plug, but they never bothered to change the tag. Have found some that a high speed adjusting screw and nut was just added. From what I remember with the change, idle jet stayed the same, main jet, nozzle jet and the airbleed size was changed.
One change over was made for the 400 carbs also.
Don't have a 361525R91 carb. at this time to double check memory, Do have a 400 gas R91 but a little different.

H Carb, RustyFarmall

GordoSD

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rustyfarmall

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pete 23

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D Slater

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GordoSD

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Farmall Bob

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pete 23

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rustyfarmall

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D Slater

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pete 23

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