I have a IH 3/4" carb and a rebuild kit for my 1948 Cub, but I think I need a manual to rebuild it. It looks like I may have a jet thats broken. Does anyone know if there is a IH Cub Carb rebuild/Parts Manual available some where?
Thanks.... Ron
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Cub Carb
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Re: Cub Carb
Here's a link to a how to by Don McCombs: viewtopic.php?f=139&t=83618
The next place to look is the GSS-1411 Blue Ribbon Service Manual that's available in the PDF Manuals above.
The first important thing is to make sure you pull the two halves straight apart or you risk breaking the idle tube. I've seen a few main jets that had the threads broken off the end. There are few things that can't be repaired on an IH carb. Post pics if you can.
Bob
The next place to look is the GSS-1411 Blue Ribbon Service Manual that's available in the PDF Manuals above.
The first important thing is to make sure you pull the two halves straight apart or you risk breaking the idle tube. I've seen a few main jets that had the threads broken off the end. There are few things that can't be repaired on an IH carb. Post pics if you can.
Bob
"We don't need to think more,
we need to think differently."
-Albert Einstein
we need to think differently."
-Albert Einstein
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Re: Cub Carb
Sounds like you might have a broken idle jet tube between the top and bottom halves of the carb. Not uncommon but can be a "bear" to remove. The bottom part just sticks down in the hole in the bowl, (lower half of the carb). Start by soaking the upper end in the carb top with a penetrating lube like KROL/PB Blaster, etc. Don't expect magic and have plenty of patience. After toroughly soaking for a while, start with a very small left hand drill bit, I believe its a #4, and HAND DRILL (NO POWER TOOL HERE). If you get lucky, the drill bit will catch and back the broken piece out. It's not very long and don't go deep enough to damage the threads in the top half of the carb. Once you get the broken piece out, the threads can be cleaned up with a tap if needed. I believe it is a #48. Someone will probably post the correct sizes or you can search the forum for other threads on this topic, it's been covered several times before. Best price on a replacement is probably McDonald Carb. Here's a post from the BOK/Fuel by Don McCombs, it's about as thorough as you will find from one of the forum carb experts. viewtopic.php?f=139&t=83618
Once again, Bob (another forum carb expert) beats me to the draw.
Once again, Bob (another forum carb expert) beats me to the draw.
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
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- Team Cub
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Re: Cub Carb
If it is the idle tube (http://www.tmtractor.com/new/fl/384fp.htm), the tap size is 4-48. The drill size for that tap is a #42 or closest fractional is 3/32. Start with a slightly smaller left hand drill bit as Stan suggested.
Bob
Bob
"We don't need to think more,
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Re: Cub Carb
Hi,
Here are 2 pages from the Cub parts book showing the IH carburetor. The pic is helpful to see how it should fit together.
I would soak especially the top and bottom castings in solvent, or carb cleaner, and then blow all the passages out with compressed air. Dirt settles in the bottom half, but could be anywhere inside the carb. Wear your safety glasses when using the air.
When you get it put together, the idle screw on top of it should be open 1 - 1 1/2 turns, the owner's manual tells how to adjust it, you run the engine at idle speed, supposed to be 500 RPM, and listen to the engine, while adjusting the screw. Set it so it idles as good as it will.
It says adjust it when the engine has warmed up. Good luck.
http://www.farmallcub.info/manuals/cub_ ... 012-12.jpg
http://www.farmallcub.info/manuals/cub_ ... 012-13.jpg
Here are 2 pages from the Cub parts book showing the IH carburetor. The pic is helpful to see how it should fit together.
I would soak especially the top and bottom castings in solvent, or carb cleaner, and then blow all the passages out with compressed air. Dirt settles in the bottom half, but could be anywhere inside the carb. Wear your safety glasses when using the air.
When you get it put together, the idle screw on top of it should be open 1 - 1 1/2 turns, the owner's manual tells how to adjust it, you run the engine at idle speed, supposed to be 500 RPM, and listen to the engine, while adjusting the screw. Set it so it idles as good as it will.
It says adjust it when the engine has warmed up. Good luck.
http://www.farmallcub.info/manuals/cub_ ... 012-12.jpg
http://www.farmallcub.info/manuals/cub_ ... 012-13.jpg
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Re: Cub Carb
Yup, I broke the idle tube- it was very difficult to separate the two halves, even though I was very careful. Ugh...
I'll get the right size drill & tap and careful remove it after a long soaking in cleaner.
Thank you, gentleman! You guys are awesome to have as friends.
Ron
I'll get the right size drill & tap and careful remove it after a long soaking in cleaner.
Thank you, gentleman! You guys are awesome to have as friends.
Ron
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- Team Cub
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- Location: CO, Longmont
Re: Cub Carb
Ron, Your Cub may run okay with the broken idle tube. The calibrated orifice is in the short threaded end. Hopefully the long piece will slip out after soaking, that one can be a bear to drill out.
Bob
Bob
"We don't need to think more,
we need to think differently."
-Albert Einstein
we need to think differently."
-Albert Einstein
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- 5+ Years
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Re: Cub Carb
Okay, thank you, Bob.
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