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Tractor Talk Discussion Forum

int 574 carb

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barbwirebob

05-21-2007 10:56:23




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i made the mistake of rebuilding the carburator on my int 574.actually it runs better now but we have to keep the choke half way closed to keep it running.any suggestions.




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barbwirebob

05-23-2007 19:03:44




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 Re: int 574 carb in reply to barbwirebob, 05-21-2007 10:56:23  
thanks to all of you it was the venturi



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barbwirebob

05-22-2007 09:57:55




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 Re: int 574 carb in reply to barbwirebob, 05-21-2007 10:56:23  
rab you are not insulting me .i appreciate your help.we rebuilt this this carb because it was constantly fooding and ran too rich no matter how we adjusted it..i believe the venturi may well be the problem.the tractor runs fine no loss of power even under load .its just that the choke has to be half way closed to run.again thanks for all your help



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Mike Van

05-22-2007 02:25:32




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 Re: int 574 carb in reply to barbwirebob, 05-21-2007 10:56:23  
Bob, Owens right on the money - I did the same thing 2 years ago - As you look at the carb the way it goes on the manifold, the big end of the plastic venturi goes UP. I must have had mine off 6 times before someone here helped me out. Mine had fallen out when I split the carb.



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Owen Aaland

05-21-2007 21:31:37




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 Re: int 574 carb in reply to barbwirebob, 05-21-2007 10:56:23  
Make sure the venturi in not installed upside down. The narrowest part must be at the top of the fuel metering tube or you will get the problem you just described.



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RAB

05-21-2007 11:42:18




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 Re: int 574 carb in reply to barbwirebob, 05-21-2007 10:56:23  
What do you mean by "rebuilding"?
If you mean you just took it apart and put it back together again, yes, you have made a mistake so re-do the job properly. If you have used a rebuild kit, is it the correct one? Not sure what the carb is like but typical problems might be poor gasket sealing or sticking float, or wrong float height or blocked jet or wrong settings or gasket on wrong way round (if is nearly symmetrical) or tank valve not turned on completely or..... ..
Likely it is an air leak into the manifold so you might try spraying area with oil spray to see if engine note responds, as leak is temporarily sealed, before taking it off again.
RAB

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barbwirebob

05-21-2007 12:00:31




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 Re: int 574 carb in reply to RAB, 05-21-2007 11:42:18  
thank you .we used a rebuild kit and it was the proper one;we"ll try your advice for leaks,this tractor has a fuel pump;could the problem be with that



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RAB

05-21-2007 15:52:12




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 Re: int 574 carb in reply to barbwirebob, 05-21-2007 12:00:31  
Do you need to close the choke part way? idling or further up the rev range? Does choking it allow "normal" operation? There could be a problem with the fuel pump, but unlikely unless you rebuilt the wrong part in the first place?! Fuel pumps are easily checked for suction and delivery pressure as per shop manual specs.
Presumably you have set the carburation since restarting it? Sorry, but not knowing your mechanical abilities where tractors or carburettors are concerned, and why you rebuilt the carb in the first place, I"m not sure whether I am helping - or insulting - you!
Regards, RAB

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