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Tractor Talk Discussion Forum

Marvel Carburetors

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J. Schwiebert

06-04-2005 18:34:28




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Is there a tech site phone or web site for M-S carburetor information>




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MarkB_MI

06-05-2005 04:17:55




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 Re: Marvel Carburetors in reply to J. Schwiebert, 06-04-2005 18:34:28  
You might try Precision Airmotive. They currently hold the manufacturing rights to Marvel-Schebler aircraft carburetors. I don't know who has the rights to the other M-S carb lines, but I suspect PA owns those as well. I seriously doubt they will provide you any technical information, but maybe they can direct you to another source.

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Alberta Mike

06-04-2005 20:20:02




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 Re: Marvel Carburetors in reply to J. Schwiebert, 06-04-2005 18:34:28  
Right here on the YT site in the left menu under "articles" there is an excellent article on rebuilding an MS cast-body carb. I think it is for an N-series Ford but all of them are pretty much the same. The only criticism I'd have of the article is the author's references to removal of brass parts like jets, fuel nozzle, needle seat, etc. He talks as if they just come out easy and they don't. You must heat the carb body (after disassembly of course) with a propane torch or perhaps heat it up in your barbeque to a nice hot temperature. The brass should come out but still be careful, once those things twist off you're left with a paper weight. And make sure that whatever you are using to remove the brass is a GOOD FIT on the brass (eg. screwdriver, wrench, etc). The heating is for cast iron carb castings, not pot metal ones.

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J. Schwiebert

06-05-2005 03:22:39




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 Re: Marvel Carburetors in reply to Alberta Mike, 06-04-2005 20:20:02  
Mike: This is not about rebuilding one.



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Alberta Mike

06-05-2005 06:34:42




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 Re: Marvel Carburetors in reply to J. Schwiebert, 06-05-2005 03:22:39  
I sort of thought that was maybe the case but I just mentioned it as a good reference. Good luck with your search. What sort of information were you looking for?



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J.Schwiebert.

06-05-2005 08:05:54




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 Re: Marvel Carburetors in reply to Alberta Mike, 06-05-2005 06:34:42  
A couple of things. We are preparing a tech article for the HPOCA news letter and I ran into a situation this week on a TSX. The problem deals with how much fuel is there in the bowl when you pull it at rated horsepower and if you hit a certain overload condition.



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Jerry/MT

06-05-2005 14:45:49




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 Re: Marvel Carburetors in reply to J.Schwiebert., 06-05-2005 08:05:54  
I'm intrigued by the problem you are trying to solve. Could you provide more details?



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J. Schwiebert

06-05-2005 16:20:00




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 Re: Marvel Carburetors in reply to Jerry/MT, 06-05-2005 14:45:49  
To answer your post one question I have is how full should the bowl be when you place the tractor on a dyno. we made a tube to check the fuel level and we were surprised to see how much it dropped. Also if you read the other post If I write a tech article I need a reference source on some parts availability and other tech items.



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Kelvin

06-05-2005 12:32:18




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 Re: Marvel Carburetors in reply to J.Schwiebert., 06-05-2005 08:05:54  
I don't have that info, but you can get an idea of what the fuel level is actually doing if you thread a nipple into the carburetor's drain and put a piece of clear plastic hose on it and fasten it so it curls up beside the carb. That is the way you check the float level is correct in some cast iron carbs.



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AZ Jack

06-04-2005 21:17:19




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 Re: Marvel Carburetors in reply to Alberta Mike, 06-04-2005 20:20:02  
Thank you Alberta Mike-many times I have given up on needle seats etc. before twisting them off. Had never thought of heating them up. Jack



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Alberta Mike

06-05-2005 06:39:39




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 Re: Marvel Carburetors in reply to AZ Jack, 06-04-2005 21:17:19  
Yes, I've done the same thing. Many carbs I've seen where the needle seat removal slot is so messed up you can't get hold of it. What I eventually did is buy one of those HUGE slot-head screwdrivers, even the cheapies from China work well. Than grind the end back until the taper finally fits the slot. Then grind two little 90 degree notches in the outside edge of the blade so that the center part of the screwdriver end drops slightly into the recess in the needle seat. That way it won't slide out sideways when you're twisting on the handle. Holding the cast body firmly is difficult, a big vise with a lot of cloth packing will work but a guy's gotta be careful.

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