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Allis Chalmers Discussion Forum

Bearing replacement on a B

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11-17-2003 19:59:48

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I was told there is a way to replace the bearings in a B engine and not have to use shims. Can someone give me the info on this? Thanks.

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Dick L

11-18-2003 03:01:26

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 Re: Bearing replacement on a B in reply to Chris, 11-17-2003 19:59:48  
No way with out taking the block and rods to a machine shop and have remachined to fit without shims.

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11-18-2003 08:11:04

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 Re: Re: Bearing replacement on a B in reply to Dick L, 11-18-2003 03:01:26  
What bearing set do you use? I read your earlier posts on the subject. Sound like it is only cost effective if I am going to use the engine as a puller. Not a lot of shops doing tractor work out here in Washington. Would it work to do just the rods and shim the crank? I suspect they shimmed them for good reason and am now wondering if I may be SHORTENING the engine life by not shimming as there would be no way to adjust for wear of the bearings on the splash lubed crank.

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Dick L Sure Chris

11-18-2003 14:31:15

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 Re: Re: Re: Bearing replacement on a B in reply to Chris, 11-18-2003 08:11:04  
That is what I did on the engines that had the rods remachined to do away with the shims. I still shimed the crank. The reason I did it was not because I didn't want to shim at all but I had drilled the crankshaft to make a full pressure system for higher RPM's and I could not be sure that rods were completely round. After you have shimed a few you find that it is not thaat big of a problem. I learned to shim on old Chevy engines but did worry a great deal thru the first couple.

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11-18-2003 21:44:43

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 Re: Re: Re: Re: Bearing replacement on a B in reply to Dick L Sure Chris, 11-18-2003 14:31:15  
Drilling the crank for pressure lubrication.... That is a good idea! Can you tell me a bit more in depth how to go about that. Thanks for responding Dick!

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Dick L

11-19-2003 12:55:22

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 Re: Re: Re: Re: Re: Bearing replacement on a B in reply to Chris, 11-18-2003 21:44:43  
I took another crankshaft from an engine that was drilled and figured out from that one where I needed to drill from the center of a main to the center of the rod. I then drilled into the journals at a 90 deg angle. I then clamped the crankshaft in a large drillpress at an angle so it would drill from the main to the rod and would be drilled just below the holes drilled at the 90 deg angle. I then closed the holes in the rods so the oil would go back out the rod to the next main. I used a D 15 oil pump for extra volume.

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