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Farmall & IHC Tractors Discussion Forum

Broken jet

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Author  [Modern View]

12-30-2012 19:12:55

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I need to remove a broken jet from a carburetor off an A. I tried to remove the jet and the brass sheared off flush, leaving me nothing to turn it with. Obviously the jet is rusted into the body of the carburetor. What would be your suggestions on removing this? I would try to drill it out but with the small, fine threads I am scared of ruining them. You can see the jet in the picture above.

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gene bender

12-31-2012 04:17:02

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 Re: Broken jet in reply to Bkpigs, 12-30-2012 19:12:55  
I dont remove that jet just use tip cleaners for the torch and also have the drills of that jet just make sure the passage is clean no real reason to remove it. Vinegar works well removing rust takes a little time but it does work.

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Rex in Australia

12-31-2012 01:07:40

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 Re: Broken jet in reply to Bkpigs, 12-30-2012 19:12:55  
Cook it in the electrolysis tank for a while. That is a good way to loosen parts rusted in. Especially in small parts like that.

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12-30-2012 20:20:50

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 Re: Broken jet in reply to Bkpigs, 12-30-2012 19:12:55  
I have left them in there just like Old said. Just so you can blow carb clean and air thru it you should be ok.
I have soaked then in White Vinager for a day or so and they have come out. But it wasn't pretty

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wayne in mn

12-30-2012 20:15:16

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 Re: Broken jet in reply to Bkpigs, 12-30-2012 19:12:55  
Drill carefully using progressivly larger bits. The thread is likely a #5-40. See your local gunsmith & borrow one.
If you buy a new jet; use it to check thread sizes.

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12-30-2012 21:33:37

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 Re: Broken jet in reply to wayne in mn, 12-30-2012 20:15:16  
EVERY carb that I have had come in that some one tried to drill a jet out ended up in my junk carb box. That is why I say leave them be as long as you can blow air and carb cleaner threw them your good to go

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12-31-2012 05:48:43

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 Re: Broken jet in reply to old, 12-30-2012 21:33:37  
They were most likely drilled with right-handed bits. Using left-handed bits and a lot of patience, I haven't ruined a carb yet.

I agree that it's best to leave it alone if possible. Drilling is strictly a last-ditch, nothing-to-lose approach.

Mark W.in MI

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12-31-2012 08:42:15

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 Re: Broken jet in reply to rumplestiltskin, 12-31-2012 05:48:43  
Yes but most people who cause the carb damage do not have a clue as to what they are doing and also do not have left handed bits. The fun one is if the venture tube breaks off down at the bottom boy those are no fun to get out

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12-30-2012 21:17:38

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 Re: Broken jet in reply to wayne in mn, 12-30-2012 20:15:16  
I would recommend left-handed bits if you can get them. Ace Hardware carries them, and I have also bought them on eBay.

Do the best you can at centering the bit on the jet, and slowly increase the bit size. The remains of the jet will likely unscrew when the bit is big enough. If you find you're beginning to nick the threads in the bowl, it's time to put down the drill and pick out the remains with an awl or a similar sharp-pointed tool.

Mark W. in MI

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12-30-2012 20:06:51

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 Re: Broken jet in reply to Bkpigs, 12-30-2012 19:12:55  
On I would say 95% of the carbs I rebuild and I have done a lot of them I NEVER even try to remove the jet because they do not come out easy and most will do just that. Sock it good use carb spray cleaner and air and wire and your stand a 95% chance it will be just fine. The wire is to poke in the holes and jets to make sure they are open. Me I use a torch tip cleaner tool instead of apiece of wire. I have seen many carbs come to me looking like that and guess what they went back on and worked just fine

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pete 23

12-30-2012 19:36:52

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 Re: Broken jet in reply to Bkpigs, 12-30-2012 19:12:55  
First off, measure the size of the hole in the jet right down to the nitty gritty so you replace it with proper jet. That is one place an eze out does sometimes work, and you won't break it off. If that does not come out, as rusty as that is , I would soak carb in muratic acid if body is cast iron, not pot medal. That will cut the rust out of all of it. About 20 or 30 percent acid to water. There are taps available to restore damaged threads for those jets.

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12-30-2012 21:39:02

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 Re: Broken jet in reply to pete 23, 12-30-2012 19:36:52  
I have found and broken a few too, put it back together it will run fine.

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12-31-2012 05:48:36

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 Re: Broken jet in reply to 504, 12-30-2012 21:39:02  
I have removed many with Easy-Out.
In the future don't use a screwdriver on those jets. Use a jet tool.

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