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Farmall & IHC Tractors Discussion Forum
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Rebuilt Carb on 300 U Leaking Gas

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Ron Smith

04-01-2005 08:49:14




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Just put the rebuilt carb on the 300U. Won't start and it is leaking gas out the air intake. Checked the plugs and they are dry, so it is not getting any gas into the cylinders. Possibly the float is stuck to the sides of the bowl or something... I'll work on it a little more later. May have to drop the bowl down. Turns over real good, but won't begin to fire. Must have a setting wrong.




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RustyFarmall

04-01-2005 13:26:14




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 Re: Rebuilt Carb on 300 U Leaking Gas in reply to Ron Smith, 04-01-2005 08:49:14  
Most likely the float is hanging/rubbing on the side of the bowl. This happens quite frequently because there just isn't much room in there. You might need to remove the entire carb from the tractor and hold it up to your ear and listen for the float moving as you rotate the carb from right side up to upside down. You can also put your mouth to the fuel inlet and blow, that way you know for sure the float, needle valve and seat are working.

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Slappy

04-01-2005 09:46:35




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 Re: Rebuilt Carb on 300 U Leaking Gas in reply to Ron Smith, 04-01-2005 08:49:14  
If you have to take it apart, check the float level first. Also the threads on the needle valve cage, and depending on the design (I don't know about the 300 U), the main jet sit below the gas level and can be possible sources for leaks. Use Permatex High Temperature Sealer - works like a charm. Usually these will manifest themselves a slow leaks that become apparent after hours or days. A stuck float will usually let you know right away. If all of these sources are eliminated, you will need to consider the possibility that you have a bad needle and cage assembly. In any event, it may be frustrating for a bit, but you can definately fix this. Good Luck.

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little john

04-01-2005 09:07:09




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 Re: Rebuilt Carb on 300 U Leaking Gas in reply to Ron Smith, 04-01-2005 08:49:14  
This might be a remote possibility...I found that the pin that holds the float in a rebuilt carb was too short. The pin could slide sideways just enough to let the float drop down and drag against the side of the bowl. I made a slightly longer pin. Just a thought.



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Ron Smith

04-01-2005 14:55:18




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 Re: Rebuilt Carb on 300 U Leaking Gas in reply to little john, 04-01-2005 09:07:09  
Got it running finally. I think the float was just rubbing/stuck on the side of the bowl. I tapped on the sides of it and it seemed to come loose. It will run at low idle like a champ, extremly smooth, which is great. When I advance the throttle though, it wants to cut out all together. I tried adjusting it several different ways w/the fuel mixture screw and the bowl adjustment. It still does it though. Could this be the linkage to the carb from the throttle? Maybe it isn't quite right. Could it be from the fuel level in the float being too low? It doesn't leak gas anymore, but I can't get it to throttle up/power up. I can adjust the idle speed screw on the side up very high and it runs great, just can't advance the throttle or it kills it. Went in a circle in the pasture on idle. It seems like it takes a lot of choking to get it started. A shot of starter fluid will get it going quickly, but other times, after it dies, it just doesn't want to start on its own.

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Joe A.

04-01-2005 18:41:43




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 Re: Rebuilt Carb on 300 U Leaking Gas in reply to Ron Smith, 04-01-2005 14:55:18  
Usually, if the governor shaft is not connected correctly, the tractor will run wide open, ready for liftoff. The float might be stuck halfway up, not letting the float open completely, starving the engine during throttling up.



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PAULIH300

04-01-2005 15:53:53




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 Re: Rebuilt Carb on 300 U Leaking Gas in reply to Ron Smith, 04-01-2005 14:55:18  
Did you align the throttle shaft with the governor drive?



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Ron Smith

04-01-2005 19:51:24




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 Re: Rebuilt Carb on 300 U Leaking Gas in reply to PAULIH300, 04-01-2005 15:53:53  
Yes, I aligned it and before bolting up the carb, I moved the throttle handle and watched the valve open and close. So, I would think that the alignment is correct as it seems like there is only one way it could go together. The throttle tang fits in the little opening on the carb shaft. It either goes in or it doesn"t. I may have rotated the shaft coming from the governor drive, but it doesn"t seem like that could make a difference.

Maybe the float isn"t working right or I have it set too low. I guess I"ll drop the bowl and take a look at it tomorrow. I"ll try bending it a bit to get a little more depth in there. That"s about the only thing there is to adjust. It will kind of throttle up, but won"t go past a certain point or it will die. It won"t move the tractor on the higher throttle. When it has some load, it cuts out.

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Ron Smith

04-03-2005 11:02:22




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 Re: Rebuilt Carb on 300 U Leaking Gas in reply to Ron Smith, 04-01-2005 19:51:24  
Dropped the bowl down this morning and found that one side of the float was full of gas. Pulled the pin and Removed the entire float. The float is split open on the bottom where it is seamed together. Took awhile for all of the gas to drain out. I'll see if I can find a new float tomorrow and will go from there. When I looked in the bowl before dropping it down entirly, I could see that the float was fairly well submerged in gas. I guess it did raise up enough to shut off the gas flow since one side was still working. I'll put in a new one and go from there. Maybe that will take care of it. I am surprised it would run as well as it did with it like that. It just wouldn't throttle up properly.

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