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JD A carburetor

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HTR

11-09-2001 19:14:41




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Does the main jet in the carburetor need to be free to move? or did they just think that the spring was the simplest way to hold it in place? Does the spring have anything to do with the function of the accelerator well?

Just curious

Thanks




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Clooney

11-10-2001 05:40:15




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 Re: JD A carburetor in reply to HTR, 11-09-2001 19:14:41  
HTR, the main nozzle doesn't have to be free to move as it doesn't move in carb operation. It should be a kind of a loose press fit. I don't know for sure why Marvel-Schebler used a spring to hold that nozzle in but will guess it was the easiest way to hold it in place & still leave it removable to clean. It has to seal fairly good at the base as any fuel leaking by the base effects the load metering. The Marvel-Schebler DLTX series uses a passive accelerator system that uses the main well as an accelerator enrichment chamber that turns into an air bleed after it is emptied & only fills again when the throttle returns to near idle. That's what the little holes in the side of the nozzle are for, when the throttle is advanced they meter fuel from the main well until it is exhausted then they are used as air bleeds to emulsify the fuel entering from the load needle valve.

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rollo

11-10-2001 04:30:27




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 Re: JD A carburetor in reply to HTR, 11-09-2001 19:14:41  
The only reason people say it needs to be free to move is because if it is not free, it is probably clogged up with rust, gunk, etc. If it is removable, people presume you removed and cleaned it as part of restoring the tractor. I have no idea what an accelerator well is.



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