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Allis Chalmers Discussion Forum
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A/C D-14

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Charlie McBride

10-21-2006 15:16:19




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my D-14 is a 1957 model. have had problems for past 2 years.starts great, runs for about 15 min. then starts running rough, choke it, runs a bit then quits. starts right away, then same all over.
Have had it worked on several times, Carb. rebuilt, gas tank cleaned, new plugs, plug wires, points and cond. new coil with resistor, 12v batt. New regulator at witts end. any suggestions 'PLEASE"
still does same thing. Engine was rebuilt approx. 12 yrs ago, only about 100 hrs used.

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Texas Denny

10-21-2006 20:03:54




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 Re: A/C D-14 in reply to Charlie McBride, 10-21-2006 15:16:19  
Mine ran quite a lot longer than you describe but had a similar problem. Was worse if the tank was near empty. I haven't gotten around to drilling the pinhole. What I'm doing now is not closing the cap. Just sit it on the tank and no reoccurence of the problem.



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glennd

10-21-2006 19:12:13




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 Re: A/C D-14 in reply to Charlie McBride, 10-21-2006 15:16:19  
Try running it with the gas cap off. Sounds like the vent isn't venting to me... Long shot, but if that's it a cap will get-r-done.



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steve(ill)

10-21-2006 18:06:57




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 Re: A/C D-14 in reply to Charlie McBride, 10-21-2006 15:16:19  
you are runnign out of gas. i would clean the suction line up in the gas tank, and the carb ports. ou might make sure the gas tank can get some air inside it (pin hole in cap?) so air can makeup the space as fuel is used. If you are sure all that is o.k., then i agree, there is a leak in the gasket between the carburetor and manifold, or the manifold to the head. it is sucking air thru the gasket and not fuel from the carb. same difference, you are running out of gas.

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russ1

10-21-2006 16:03:44




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 Re: A/C D-14 in reply to Charlie McBride, 10-21-2006 15:16:19  
Since you have aleady done the work on several things, I suspect a gasket at the intake manifold to block or carburetor to manifold that is allowing air entry when hot. It sounds like air entrainment after the carburetor is the culprit.



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