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Allis Chalmers Discussion Forum

Allis D-17 - Carb setting

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12-10-2003 11:13:32

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What are the carb jet setting supposed to be. Marvel carb. One jet is a screw on top the other is "L" shaped and located at 45 degrees to bottom front. Not sure that one is as it is supposed to be. Cannot find any information.

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12-11-2003 11:47:13

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 Re: Allis D-17 - Carb setting in reply to Ed, 12-10-2003 11:13:32  
Purring like a Kitten now. Thanks.

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12-11-2003 06:55:29

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 Re: Allis D-17 - Carb setting in reply to Ed, 12-10-2003 11:13:32  
As the other post said, the one on top is for idle and the one on the bottom adjusts the main jet. To adjust the main jet, have the engine running wide open and turn the main jet in until the engine begins to miss. Then open until it runs smoothly then give it maybe a quarter or half a round more. Then idle the engine and take the throttle all the way to wide open. Engine should accelerate with no hesitation. For the idle screw, I usually just play with it a little until it runs best, but again turn it in until the idle is poor then open until it runs good. Idle speed is controlled by the screw by where the governor rod is attached to the carburetor on the back.

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12-10-2003 14:07:10

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 Re: Allis D-17 - Carb setting in reply to Ed, 12-10-2003 11:13:32  
On most carbs its 1 turn out for the top/idle adjust and about 1-3/4 for the load, but this is just a starting place from there you need to adjust them till the tractor runs well. Hope this helps

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