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Allis Chalmers Discussion Forum

WD- gas in oil ?

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03-08-2004 15:29:48

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The WD has been working great all winter moving snow. Lately she seems to be using more gas and running rough. I checked the oil and it seems thin and smells of gas. How could this quantity of gas make it into the oil? There is a good spark on all 4. Suggestions?

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Dave K

03-14-2004 16:07:46

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 Re: WD- gas in oil ? in reply to RW, 03-08-2004 15:29:48  
Usually caused by sticking float in carb or float level set too high. Be sure to shut off the fuel when not running. Good carb rebuild kit is about $30 and easy to do.


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Lee Sackett

03-08-2004 21:38:21

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 Re: WD- gas in oil ? in reply to RW, 03-08-2004 15:29:48  
I troubleshot a tractor that I had that problem with for a LONG time before checking the valve clearances, and that was the problem. Valves were not closing completely, so it was not getting full combustion, thus gas was getting into the oil.

Maybe in your situation that's not the first thing to try. What do the plugs look like? Are they fouled? It could just be running too rich and the carb may need adjustment. If the needle valve was stuck open, then you'd flood out and gas would drip from the carb if you didn't shut the gas off every time you stopped the engine. A flooded engine will let some gas into the oil. Any of these things happening to you?

Email me directly at lsackett@iname.com if you would like.

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03-09-2004 18:20:25

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 Re: Re: WD- gas in oil ? in reply to Lee Sackett, 03-08-2004 21:38:21  
This probably isn't the problem but could contrubute to it. Is it running up to temperature? If it is running cold the fuel may not be vaporizing properly and running down past the rings all the time. You need 190 degrees,at least 180. Especially in cold weather. Engines like to run nice and warm. AC said 180 for gas, 190 for tractor fuel.

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