JD carb fix.
#1
I got this 1938 JD carb from a customer and the threads were shot where the float bowl nut screws on. The bottom 3 threads were stripped off. So after pondering how to fix without welding i can up with this. I bored a stub of metal for a 7/8-18 thread to match the existing threads and made sure it screws on tight since there were good threads on the upper part. I threaded it with this custom ground HSS threading tool since it was against a sholder on the inside. Took 4 or 5 passes and it fit great. The black line on my tool bit is my depth stop. Then i threaded another stub 7/8-18 OD for this adaptor to screw onto to thread the OD and trim to length. Then i will make a custom 1-18 acorn nut to replace the old 7/8-18 and it should be fixed. To be continued and more pics to come...Bob


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Bob Wright
Metal Master Fab
Salem Ohio
Birthplace of the Silver and Deming drill bit.
5 Lathes, SBL Shaper, Lewis Mill, 7 drill presses, 5 welders...
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#2
Ok here is the threaded part on my stub manderal. And then screwed onto the carb body. Now to make a new nut from hex stock...Bob


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Bob Wright
Metal Master Fab
Salem Ohio
Birthplace of the Silver and Deming drill bit.
5 Lathes, SBL Shaper, Lewis Mill, 7 drill presses, 5 welders...
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#3
Nice re-do Bob, customer should be happy with that.
sasquatch, proud to be a member of MetalworkingFun since Jul 2012.
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#4
I agree - nice fix.
Hunting American dentists since 2015.
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#5
Great save Bob. That Deere will be thumping away again in no time. Thumbsup
Willie
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#6
Nicely done Bob, Smiley-signs107
Smiley-eatdrink004
DaveH
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#7
Very nice
Clever but simple WorthyWorthyWorthyWorthy
John
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#8
Here are the final pics. I made a new hex acorn nut and got it threaded. Then i bored the float bowl body out a good 1/16" with my spindle mounted boring head. Ready to ship back...Bob


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Bob Wright
Metal Master Fab
Salem Ohio
Birthplace of the Silver and Deming drill bit.
5 Lathes, SBL Shaper, Lewis Mill, 7 drill presses, 5 welders...
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#9
I may be slow but sooner or later I get it. 17428SlapheadSmiley-signs107
so the threaded sleeve you made was so the acorn nut that holds the bowl to the carb had something to thread on to.
Very nice indeed Bob.Smiley-eatdrink004
Jerry. Popcorn
ETC57, proud to be a member of MetalworkingFun Forum since Feb 2012.
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#10
well dun
krv3000, proud to be a member of MetalworkingFun Forum since Feb 2012.
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