Carb rebuild

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delco32
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Joined: Thu Aug 29, 2019 12:01 pm
Zip Code: 18929

Carb rebuild

Postby delco32 » Wed Oct 16, 2019 4:34 pm

Hi Folks!

I've recently rebuilt the original IH carb for my 55 with a full premium kit.. Had to replace the idle tube and gently worked on flattening the top casting as it was warped a bit. Put it on and just seemed like not enough fuel had to run on choke. I got it to a happy place after gently tapping and making sure new needle valve wasn't stuck. It dies on any load. I don't think it was sucking air though the gasket.

The cheap Chinese carb that you see selling everywhere actually works very well ( yes I have one of those new) even though it smells rich to me. Now of course I can continue to use the Chinese one, but would rather get the IH one happy.

Anyone else run into this with their carb rebuild?

Thank you

Mike

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Don McCombs
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Tractors Owned: "1950 Something" Farmall Cub
1957 Farmall Cub w/FH
1977 International Cub w/FH
1978 International Cub
1948 Farmall Super A
Circle of Safety: Y
Location: MD, Deep Creek Lake

Re: Carb rebuild

Postby Don McCombs » Wed Oct 16, 2019 4:51 pm

Tell us what all you did to the carb in addition to replacing parts.
Don McCombs
MD, Deep Creek Lake

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Stanton
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Re: Carb rebuild

Postby Stanton » Thu Oct 17, 2019 7:04 am

delco32 wrote:...but would rather get the IH one happy...


Let Don know exactly what procedure you followed and he'll help you out.
Stanton
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delco32
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Re: Carb rebuild

Postby delco32 » Fri Oct 18, 2019 10:21 am

Honestly, nothing magic. Just cleaned castings, screwed in new tube, set float hieght, installed new throttle shaft and felts.

I don't remember if the venturi casting is removable, but did clean out idle passage with a wire. Everything else replaced as usual

The top casting was warped at float bowl, but tapped it flat as I could. I dont think its leaking air there.

Perhaps the passage at the bottom of the bowl to the idle tube isn't completely open?

Thank you !!

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Don McCombs
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Posts: 14548
Joined: Mon Feb 03, 2003 6:45 am
Zip Code: 21550
Tractors Owned: "1950 Something" Farmall Cub
1957 Farmall Cub w/FH
1977 International Cub w/FH
1978 International Cub
1948 Farmall Super A
Circle of Safety: Y
Location: MD, Deep Creek Lake

Re: Carb rebuild

Postby Don McCombs » Fri Oct 18, 2019 3:22 pm

If you did not remove the main jet and clean it thoroughly, I would do that now. The main jet is the brass hex head fitting on the side of the bowl. Clean the small orifice with a thin copper wire. Squirt some carb cleaner through it and blow everything out with compressed air.
Don McCombs
MD, Deep Creek Lake

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delco32
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Zip Code: 18929

Re: Carb rebuild

Postby delco32 » Fri Oct 18, 2019 5:42 pm

Thank you, note that all of those parts are new from the premium kit I have used. New float too.......

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Glen
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Re: Carb rebuild

Postby Glen » Fri Oct 18, 2019 6:00 pm

Hi,
If you can't get it to run right, and the mixture seems too lean, try putting in the original main jet, in the lower side of the carburetor, and see if it runs better.

If it runs normally again, the new main jet probably has the wrong size hole for the carb you have. :)

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delco32
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Re: Carb rebuild

Postby delco32 » Sat Oct 19, 2019 7:50 am

Will do and thank you :D

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delco32
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Re: Carb rebuild

Postby delco32 » Sun Oct 20, 2019 9:35 am

OK, confession time. I had rebuilt it, but did not realize the fitting in the bottom side of the bowl had a passage through it. I had assumed it was open at the size you can see, WRONG......

I pull it out and solidly plugged up. Put a new fitting in from kit and break it off as I got too gorilla with it. Used the 3/32 left handed bit and pin vise holder to remove that and used the clean old one again,,,,,

Lesson to be learned, is that not all carb fittings are the same, and I have done many small carbs in the past, just not this one,,,,

I think it will be OK now,,,,

Mike


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