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Allis Chalmers Discussion Forum
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Allis Chalmers Model B

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JKNSC

05-23-2005 02:35:11




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I have a 1949 Allis Model B and was wondering if anyone could give me some idea of where to start to get it running again. It ran really well a couple years ago but hasn"t been cranked for a couple years and now just turns over but makes no audible attempts at cranking. I don"t think much is wrong with it, I just don"t know where to start. Any help greatly appreciated. Thanks!




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Texas Denny

05-23-2005 06:36:13




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 Re: Allis Chalmers Model B in reply to JKNSC, 05-23-2005 02:35:11  
These tractors need only two things to run - fuel and spark. You need to be sure that the carburetor is clean and getting a supply of fresh fuel. Often, sitting tractors develop all kinds of fuel problems - clogged tanks, clogged settling bowls, clogged gas lines and finally carbs with stuck needles and seats and clogged air and fuel passages. Check spark by pulling a plug and getting the metal threads or wrench portion connected to a good, solid ground. then turn over tractor and watch for a spark on the plug. If you have the plug grouded well and your system is working, you should see a spark.

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Dick L

05-23-2005 09:41:27




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 I can Think Of A Third in reply to Texas Denny, 05-23-2005 06:36:13  
Which is compression. Sticky valves from setting and bad rings when last run and no oil to block the blow by.



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Texas Denny

05-23-2005 12:16:18




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 Re: I can Think Of A Third in reply to Dick L, 05-23-2005 09:41:27  
Dick, you are, of course, absolutely correct. Since it was turning over good, and it had set only a couple of years, and it is an Allis Chalmers, I figured compression was less likely than gas or spark. I missed this one. I had an Oliver engine that was supposedly freshly rebuilt and set on the floor in a garage. When I tried to start it after installing it, it lacked compression. Pulled the manifold and discovered that mice had used the head for their home - it was full of shlled corn and nesting materials. It had set for 20 years but I guess it could happen faster than that. I doubt that rings set up that fast but then I don't know the conditions of storage. Excellent point!

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