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Allis Chalmers B engine

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wdtom

11-20-2005 16:43:35




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Saturday while pulling a trailer with fire wood with our AC-B my brother and I noticed a rapping or knocking in what turned out to be the engine. Within a hundred yards of going along in third it went from "do I hear anything or is it just some odd rattle" to "I don't want to run this engine anymore until I fix whatever is making that noise". I stopped the tractor, my brother got off the trailer and went around to the side of the engine and told me the sound is comming from the engine, it was loud enough that I shut it off at this point and we towed it back to the house. The long and short of it is that we ended up with the engine on an engine stand and the pan off, could find nothing by looking and feeling for play. Next day we started pulling and checking rods, found one that the upper bearing shell was just comming apart. This engine has been a good runner, strong, with good oil pressure, which we keep clean oil in. There were no knocks until this failure. Before we owned it the original owner had it since new, using it for mostly snowplowing. From the look of the engine and measurements of crank, it had never been worked on since new, probably around 1950. Anybody know what might make a bearing fail like this? On the front half of the upper shell the metal surface was mostly gone, on the rear half it had cracks running back and a few pieces of the surface were gone. I am glad I shut it down when I did. Crank looked good, rod surfaces miked out within new except for the bad one which was .0008" out of round. Mains were round but .004" worn. Will be grinding crank and installing new bearings.

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old

11-20-2005 18:27:45




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 Re: Allis Chalmers B engine in reply to wdtom, 11-20-2005 16:43:35  
Well if it hasn't been opened up since it was new, you can say and I would believe its old age. Shoot your lucky it didn't blow and who knows how many hours are on the engine, and if thats still factory I'd say it did well for how old it is.



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Mark - IN.

11-20-2005 18:39:19




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 Re: Allis Chalmers B engine in reply to old, 11-20-2005 18:27:45  
Post it under the AC board. Can't remember if it's Denny or Rod, or both that tear them down in their sleep, and often have photos of them in pieces. They're pretty good with them B's, and at least one of them has a website dedicated to them. There's a lot of good B knowledge over there. Give it a shot and good luck.

Mark



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old

11-20-2005 19:09:06




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 Re: Allis Chalmers B engine in reply to Mark - IN., 11-20-2005 18:39:19  
Might want to post that to him not me LOL



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Mark - IN.

11-20-2005 19:23:00




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 Re: Allis Chalmers B engine in reply to old, 11-20-2005 19:09:06  
Sorry Old. I caught that too, but damage already done. Besides, went over to the orange board and he'd already posted it anyway. Long day, fell asleep tonight at the dinner table. Time for bed, but figured I'd check in to see. Appears that I'm only half checked in, so I guess is why is bedtime. Good night.

Mark



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old

11-20-2005 19:32:16




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 Re: Allis Chalmers B engine in reply to Mark - IN., 11-20-2005 19:23:00  
I always get a good laugh when people do that sort of funny but it may not help some one some time.



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