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Allis Chalmers Discussion Forum
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Gasoline in Oil

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John Draper

08-23-2004 07:48:34




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I have WD-45 Allis. Starts and runs well but seems to have a gasoline leak into crank case.
what's my problem?
Thanks,
John Draper
303 S. Main
Williamstown, KY 41097
1-859-824-3227




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mowr

08-23-2004 19:09:29




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 Re: Gasoline in Oil in reply to John Draper, 08-23-2004 07:48:34  
It's important that the air intake system be well sealed so the engine doesn't suffer wear from dirt coming in with the air. This means that gas in the intake often doesn't go out on the ground when you might wish it would. (1)The needle and seat ass'ys in these carbs are good (bad) about getting to the point that they don't work as well as they used to (like some of us). Then, when the tractor sits, the fuel builds up in the intake system until it flows past the valves, past the rings and into the crankcase. I've seen this several times and for me the solution is; always turn the gas off once the engine is shut down. (2)Some tractors have a mechanical fuel pump on the engine which can allow fuel into the crankcase if the diaphragm goes bad.

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Gene

08-23-2004 09:41:51




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 Re: Gasoline in Oil in reply to John Draper, 08-23-2004 07:48:34  
That tractor has an updraft carburator - carburator is lower than the intake manifold. If you had a gasoline leak, gasoline would be running out the carburator. You might get some raw gas vapor into the crankcase on startup if one of the plugs is not firing and the rings are bad - but if the tractor starts easily and runs fine - I don't think that's the problem.

I don't have a good answer on how gasoline would get into the crankcase, unless someone put it there by mistake.

If you think there is gasoline in the oil, I would change the oil and oil filter. Run the engine for a while then check again.

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Gene

08-23-2004 22:38:24




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 Re: Gasoline in Oil in reply to Gene, 08-23-2004 09:41:51  
Ah! On the bottom of the Zenith and Marvel-Schebler carburators is a little thing called plug expansion, air intake drain.



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