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21st February 2013, 12:21 PM #1Senior Member
- Join Date
- May 2011
- Location
- Salem Ohio
- Age
- 65
- Posts
- 214
JD tractor carb repair. Lots of threading.
I got this 1938 JD carb from a customer who saw my CraigsList ad and the cast iron post was wore off where the cast iron float bowl screwed on. I said send it to me i can fix it, somehow. I was going to weld in a new end but figured that would be my last resort. So i turned a small chunk of steel and threaded it to match the threads on the wore off post. They were 7/8-18 and there were 4 or 5 good threads left. Then i threaded a small chunk of steel 7/8-18 to screw the first part i made onto to hold it for threading of the OD which will be 1-18 and to cut the length. So i got the 1" OD threaded now it looks like a threadsert or a small pipe bushing. I screwed the new part onto the carb and checked the length. Now to make a new nut that will be 1-18 on the ID but it has to be an acorn type nut. So i made the hex on my shaper from barstock chucked it up and finished shaping the end and cut it off 9/16" long. Rechucked up the 9/16" part and drilled it a little for final boring and threading. Then came the fun part threading the 1-18 which is only 3/8" deep and a blind hole. So i put a sharpie line on my little HSS threading tool so i know where to stop. Made a few cuts and the carb screwed on perfectly. Long winded i know but it was a fun repair and the carb should last another 75 years...Bob
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21st February 2013 12:21 PM # ADSGoogle Adsense Advertisement
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21st February 2013, 12:24 PM #2Senior Member
- Join Date
- May 2011
- Location
- Salem Ohio
- Age
- 65
- Posts
- 214
Few more pics. Then after i got all of the threading done i needed to bore out the float bowl body for the new bigger dia center post. Easy setup with my lathe spindle mounted boring head and an angle plate on my cross slide where my compound was removed...Bob
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21st February 2013, 12:25 PM #3Senior Member
- Join Date
- May 2011
- Location
- Salem Ohio
- Age
- 65
- Posts
- 214
Last pic. The carb back together. Now to make some gaskets...Bob
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21st February 2013, 12:39 PM #4Senior Member
- Join Date
- Sep 2008
- Location
- Riddells Creek
- Posts
- 300
A good choice of repair method Bob, welding is not always the way to go.
Lex.
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21st February 2013, 12:41 PM #5SENIOR MEMBER
- Join Date
- Jun 2012
- Location
- SA
- Posts
- 1,478
Nice job.
All looks good.
Thanks for the photo's.
Another option would be bronze brazing - works well on cast iron.
Cheers
Rob
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