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Farmall & IHC Tractors Discussion Forum
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Low idle jet Farmall H

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rogstown

07-22-2017 05:09:03




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Good Morning does anyone know where I could get a low idle jet for a farmall H, thats all I need. I have already bought a Kit that didn't come with one Now I realized I need that.
Thanks and good luck with your projects.

-Kyle




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rustyfarmall

07-24-2017 06:30:43




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 Re: Low idle jet Farmall H in reply to rogstown, 07-22-2017 05:09:03  
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That method of cleaning the idle metering circuit is pretty much how I do it when the jet does not want to come out.

Usually, when the adjusting screws have little effect, it is because the carburetor is still dirty, but in your case, a manifold with issues will make it nearly impossible to adjust the carburetor.



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rogstown

07-24-2017 06:24:23




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 Re: Low idle jet Farmall H in reply to rogstown, 07-22-2017 05:09:03  
I was able to get it opened up with the torch orifice cleaner and some carb cleaner, thanks for the tip! I then stuck the end of the carb cleaner straw at the jet port from the bottom of the carb and sprayed through the jet and it worked great.....

So after getting it running and idling here's what we found. It starts great but loves to be about half choked the whole time. When I throttled up or down it pretty much wanted the same amount of choke. Also the Idle needle and the fuel mixture screw didnt make much of a difference at all when we were trying to adjust... Whether the screw was all the way out or almost all the way in it was pretty much the same.... Thoughts? I've got a new manifold on the way because current one is junk. We think air must be getting in somewhere???

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pete 23

07-22-2017 11:22:52




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 Re: Low idle jet Farmall H in reply to rogstown, 07-22-2017 05:09:03  
I am working on a carburetor off a M engine. Some one broke off the idle jet long time ago as carburetor was totally covered in grime. I drilled it out and tapped the threads. I am down to my last spare idle jet from junked out carburetors. I haven't checked the parts book or service manual for the correct size yet but I have the wire gauge drills to check it with and open it up if necessary as I know it is the smaller size now. That hole in the jet is very , very small and the jet needs to come out to clean that carburetor as there can be junk down in the much larger passage below it. IH used #70 to #75 jets which is like .020 to .025 or thereabout.

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rogstown

07-22-2017 07:36:24




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 Re: Low idle jet Farmall H in reply to rogstown, 07-22-2017 05:09:03  
I will try that.



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rogstown

07-22-2017 07:31:21




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 Re: Low idle jet Farmall H in reply to rogstown, 07-22-2017 05:09:03  
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The top of the Jet is broke where you are supposed to be able to unscrew it, I can't unscrew it with a flat blade, I need to get it out to clean



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old

07-22-2017 09:33:01




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 Re: Low idle jet Farmall H in reply to rogstown, 07-22-2017 07:31:21  
Learned years ago to leave those brass jet where they are and clean them wit ha torch tip cleaner tool and air and spray carb cleaner. Rebuilt tons of carbs and never pulled them since I have seen so many broken. Take gun smith screw drivers to pull them and even then good chance they are not going to come out since they have been in forever. If that is all that is wrong wit hit clean it out as said and live with it. Bet I have more then one with that type of problem on the place and the engine runs just fine

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David G

07-22-2017 07:44:58




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 Re: Low idle jet Farmall H in reply to rogstown, 07-22-2017 07:31:21  
It is pretty common for the slots to be bad due to people not using correct tools to remove, should work fine if the hole is in good shape, just rod it out.



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rogstown

07-22-2017 07:24:56




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 Re: Low idle jet Farmall H in reply to rogstown, 07-22-2017 05:09:03  
Wow $48.75!



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D Slater

07-22-2017 10:18:44




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 Re: Low idle jet Farmall H in reply to rogstown, 07-22-2017 07:24:56  
IH dealer should be in the high thirties. Aftermarket ones in Midwest in the low twenties in at least one place.



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rustyfarmall

07-22-2017 07:15:04




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 Re: Low idle jet Farmall H in reply to rogstown, 07-22-2017 05:09:03  
If yours is damaged or missing, then you need a new one, but if it is intact, do not attempt to remove it. Use a torch cleaning tool and run the smallest wire down through the jet and also spray some carb cleaner directly into that jet. There are ways to remove it without damage, but it requires heat and patience.

Most of the new, aftermarket idle metering jets I have installed require some massaging. The threads are off just enough that it will not simply just screw in.

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D Slater

07-22-2017 07:11:31




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 Re: Low idle jet Farmall H in reply to rogstown, 07-22-2017 05:09:03  
Carburetor # 45108 came on distillate or kerosene H and 50981 on a gasoline. Distillate used a 49798D75 idle jet and gasoline a 49798D74. Put 49798D74 in your search box and you can find the part for sky high and lower priced if that's the jet wanted. You can get the D75 from mcdonald carb and ignition for 9.99 and I would probably use it for the gas carburetor also. If I remember correct the D75 is about .021 orifice and the D74 would be about .022.

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David G

07-22-2017 06:25:12




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 Re: Low idle jet Farmall H in reply to rogstown, 07-22-2017 05:09:03  
Can you just reuse the old one?



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