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47 9n(2n) carburetor

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Coach 71

08-21-2001 10:03:58




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The illustrations/pictures I've seen of these carburetors seem to show the idle circuit adjust screw on the front or outer side, on my 2n the adjust screw is on the back side(the side next to the block) and it is hard as in next to impossible to adjust the idle after the tractor is up to operation temp, it's not easy to do when it's dead cold, I just can't quite seem to get a screwdriver in the slot and be able to turn it without removing the carb first. Are all these carbs that way or is mine backwards, deformed, or what?

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bg

08-21-2001 16:20:27




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 Re: 47 9n(2n) carburetor in reply to Coach 71, 08-21-2001 10:03:58  
I had some correspondence with a shop that rebuilds Marvel carbs. The guy told me that the many of the carbs are identical in operation(jets etc.) but have the body configurations mirrored for different applications. I think your carb has probably been switched out sometime. You should have a TSX33. My 1947 2N Service Manual shows everything on the outboard side of the carb.



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Mountainman

08-21-2001 12:30:48




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 Re: 47 9n(2n) carburetor in reply to Coach 71, 08-21-2001 10:03:58  
The Master Parts Catalog shows the later model NAA carb as being almost a mirror image of the 9/2/8N carb, and it mounts on the other side of the engine. You probably have a later model carb.

Mountainman (CA)



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Dell (WA)

08-21-2001 12:15:13




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 Re: 47 9n(2n) carburetor in reply to Coach 71, 08-21-2001 10:03:58  
Coach..... .not quite certain how ya done it but as I understand your explaination, the carb appears to be mounted 180 deg from normal.

Idle mixture adjustment screw should be accessable from outside..... .Del



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Ed-Illinois

08-21-2001 12:12:00




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 Re: 47 9n(2n) carburetor in reply to Coach 71, 08-21-2001 10:03:58  
My '46 2N is set up that way. The main screw and mixture screw are on the outside (away from engine) and the idle screw is on the inside (toward engine). I belive it is this way because of the governor linkage. And yess, it is hard to adjust with a warm manifold near your knuckles.



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Bill W.

08-21-2001 17:48:44




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 Re: Re: 47 9n(2n) carburetor in reply to Ed-Illinois, 08-21-2001 12:12:00  
A long keen screwdriver works well. Your idle adjustment screw is where it should be according to F0 4 manual. Idle mixture screw and main adjustment screws are on outside and front end of carb respectively.



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