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Allis Chalmers Discussion Forum
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B Crank End Play

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Don TN

01-20-2005 18:15:45




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I just shimmed and torqued the main bearings on my 39 B. Everything seems to be great except I have 0.030 end play on the crank. Between the timing gear and the front bearing there is a 0.047 thick spacer that I cannot find in the parts book. Should I simply replace this space with a new spacer that will compensate for the end play, or should any new spacers be placed at the rear of the crank? Thanks for your help.

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Dick L

01-21-2005 07:48:56




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 Re: B Crank End Play in reply to Don TN, 01-20-2005 18:15:45  
Someone had a creative mind when regrinding the crankshaft. That is not a reason that you should not be just a creative. I might make another spacer (IF the timing gears will match up.) I would check first to make sure the crankshaft timing gear was pressed on far enough before the spacer was put in. You need an engine person from a machine shop that grinds crankshafts to look it over. You can have the crankshaft timing gear altered so it can be pressed on a few thousands farther to do away with the spacer. Not much advise can really be given without actually inspecting the crankshaft while laying in the block.

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Don TN

01-21-2005 09:01:18




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 Re: B Crank End Play in reply to Dick L, 01-21-2005 07:48:56  
Dick,
Thanks for the input. I just came back from my shop where I think I found what the problem was. One of the very few things on the whole tractor that I had not disassembled was the timing gear on the crankshaft. When I took it off this morning, I found the reason for the spacer. Whoever took the gear off the last time did so with a chisel. The back side, which I now tend to believe was intended to be a bearing surface for the front side of the front main bearing, was chewed up something awful, so the spacer had been put there to keep the chewed up gear surface from destroying the side bearing surface of the front bearing. The problem is that the spacer is the same size as the journal on the crank, so it provided no bearing surface. The crank just floated between the front side of the 2nd and 3rd bearing caps and the rear bearing surface of the front bearing. I have dressed the surface of the gear, but it is still to bad to use against the bearing, so I am off to find a thrust washer of the proper size that will provide a bearing surface yet not interfere with the cam gear.

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Dick L Your A Good Man

01-21-2005 09:09:45




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 Re: B Crank End Play in reply to Don TN, 01-21-2005 09:01:18  
Might be easyer to get a new/used gear. I have a couple of them. The parts guys like Roger VanCamp should have lots of them.



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Don TN

01-21-2005 14:22:53




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 Re: B Crank End Play in reply to Dick L Your A Good Man, 01-21-2005 09:09:45  
Dick,
You were right, it would have been easier to buy the gear than to buy a thrust washer, but I did not want to wait a week to get it. What I ended up doing was making the thrust washer out of some semi-hard steel, turning the OD down to just under the root of the gear teeth, polishing the side towards the bearing, cutting a key slot in it, and also making a 0.005 thick shim just under the diameter of the journal. Placed the shim next to the journal, put the thrust washer on, then pressed the gear on. I now have 0.002 to 0.004 endplay and all journals are centered on the bearings. May not be perfect, but it beats the 0.030 slop it did have. Thanks for your help.

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