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Case Tractors Discussion Forum
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Case VAI Problems

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Roger A. NY

10-14-2003 09:40:46




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I have a VAI that will only run with the choke nearly full on. The carb has been apart 4 times and cleaned with carb cleaner, compressed air, (lots of it) and a wire through every passage, (several times) and a new carb kit installed. It is a Marvel Schebler TSX 114 carb. I have cleaned and looked for any place that could have a vaccuum leak and found nothing. I have tried putting propane around every thing and no change in engine. I have also tried carb cleaner and ether around everything with no results. The air cleaner is removed so that is not restricting the flow. What the heck am I missing. I would have thought that a leak would show up with this much of a problem. Thanks for looking and any ideas!

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Joe (Wa)

10-14-2003 21:26:23




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 Re: Case VAI Problems in reply to Roger A. NY, 10-14-2003 09:40:46  
Hi Roger, You have probably put a new throttle shaft seal in but put some plumber's putty around there just for a check. Anyway it takes quite a large vacuum leak to lean out the mixture to where you need full choke.

I've worked on only two VAC's that req full choke and then would backfire under a light load if the choke was moved open.

Both times it was lack of fuel. One was restricted orifices in the main nozzle. The other someone had replaced the power jet and had damaged the screwdriver slot on the top. The orifice looked ok but must have been distorted. A new jet installed cured the problem. The jet can be damaged with wire or drill bit cleaning. It is nearly impossible to look down in there and tell if is good or not with any reasonable certainty. Joe

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Baggsy-Wy

10-14-2003 14:07:21




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 Re: Case VAI Problems in reply to Roger A. NY, 10-14-2003 09:40:46  
Manifold leaking? You have to be getting some extra air in there somewhere...



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Roger A. NY

10-14-2003 13:46:55




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 Re: Case VAI Problems in reply to Roger A. NY, 10-14-2003 09:40:46  
I forgot to say that I have lots of gas flow to the carb at a good rate. I put a can under the line and ran over a pint out and pulled the drain plug from the bottom of the carb and ran about a pint out at a good rate.



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Roger A. NY

10-15-2003 05:48:26




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 Re: Re: Case VAI Problems in reply to Roger A. NY, 10-14-2003 13:46:55  
Thanks for the comments. I took another carb off of another VA, and after MUCH cleaning and a rebuild, it runs fine, so there must be something wrong with carb. I am still going to try and get the original one fixed as I need the second one for the other tractor. So I guess it is "pull it apart" time again. I am suspect that, like Joe WA said, it is that jet in the bottom of the high speed circuit. Thanks again guys!

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