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Farmall & IHC Tractors Discussion Forum
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300U carb problem

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Randolph W. Bac

01-28-2008 05:36:27




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I had my mechanic rebuild the carb on my 300U. I put it back on yesterday and can't get the tractor to start at all, won't even pop once. Raw gas is pouring out the intake when I'm cranking the engine over. It doesn't matter if I'm choking it or not. I put my hand over the intake when cranking it has allot of suction. I need to talk to my mechanic latter today but was wondering what some of you might think the problem is. In the past the tractor has allways fired up right away.

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bc

01-28-2008 14:19:49




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 Re: 300U carb problem in reply to Randolph W. Bach, 01-28-2008 05:36:27  
I've been fighting the same thing after numerous take aparts with mine on a c-263. I hope it is fixed now.

When you take it off, shake it to see if you hear the float going up and down. The gasket can hang up the float like he said.

One or the other sides of the float could be bent where it catches on the inside or outside of the interior of the carb.

I had to replace a needle and jet because the with first one I adjusted the float with the needle in the seat and the pushing of the needle into the seat during the adjustment made it stick all the time. There is some type of black fiber stuff on the needle tip and anti-seize wouldn't keep it from sticking.

I also found that over years of use, the place in the float where the needle rides had created a slight indention into the soft float metal so with the float properly adjusted at 1 5/16" it wouldn't push the jet all the way up and shut off. So far, and I hope it keeps working, instead of spending $41 for a float, I tried to flatten out the depression a little bit with a punch on a flat surface. I didn't get it all out so I adjusted the float to 1/16" over to 1 3/8". By the way, on mine and probably the one Red is talking about, you measure from the top edge of the throttle body to the bottom of the float to adjust it. You do this with the float hooked up and then turn over the throttle body upside down. The more you add to the 1 5/16" setting actually lowers the float in the bowl so that should make it less prone to flood, but on the other hand it could cause some fuel starvation possibly.

hope this helps

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rumplestiltskin

01-28-2008 11:05:21




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 Re: 300U carb problem in reply to Randolph W. Bach, 01-28-2008 05:36:27  

When you take the carb apart to check it, make sure the bowl gasket is trimmed flush with the inside walls of the bowl. Otherwise the float can rub and/or bind on the gasket. (Just one possibility of several.)

Mark W. in MI



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Red Mist

01-28-2008 07:27:59




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 Re: 300U carb problem in reply to Randolph W. Bach, 01-28-2008 05:36:27  
Sounds like the float pivot pin has shifted part way out of place and the float is cocked and not functioning. Before putting pin back into place, pinch the split prong together to keep a little pressure on the pin so that it won't move sideways.
These carbs perform well if you add some to the numerical measurement when setting the float levels. I add about 1/8" to each measurement. I.E., where is says set float level at 1 5/16", I set mine at 1 7/16". I do same with maximum drop measurement. They perform well at this setting, the needle and seat work better, and they don't flood and drip. Well... they might flood and drip if some foreign material got into the needle/seat area, but this setting sure eliminates most of the typical flooding problems.
mike durhan

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RustyFarmall

01-28-2008 07:52:51




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 Re: 300U carb problem in reply to Red Mist, 01-28-2008 07:27:59  
Increasing the float level by 1/8" is almost guarateed to result in flooding, and allowing the float to drop any further will result in the float striking the bottom of the bowl. The recommended float adjustment specs were arrived at after lots of testing by qualified engineers. I am not about to try and outguess them.



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Red Mist

01-28-2008 15:32:27




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 Re: 300U carb problem in reply to RustyFarmall, 01-28-2008 07:52:51  
Rusty: Increasing the float level measurement REDUCES the amount of gas in the bowl. Think about it: The carb is upside down when you are taking the initial setting! It will reduce the probability of flooding. Come hear my super H, super A and Super M run. And, see for yourself.... I triple-dog dare you. (LOL)
mike durhan



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RustyFarmall

01-28-2008 21:58:06




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 Re: 300U carb problem in reply to Red Mist, 01-28-2008 15:32:27  
You can do yours that way if you want, but when I rebuild a carb for a customer, I set it to factory specs.



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RustyFarmall

01-28-2008 06:25:48




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 Re: 300U carb problem in reply to Randolph W. Bach, 01-28-2008 05:36:27  
Your mechanic has missed something, or has done something wrong. I'm thinking an issue with the float. If your mechanic has never been into one of those double float carbs, he probably missed something.



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