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Allis Chalmers Discussion Forum
Show Parts for Model:

b-125 crank kit

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Tim Lockey

12-07-2013 11:22:41
24.74.223.67



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rec ently got a crank and bearings from a machine shop that doea alot of tractor work. The crank was reground and bearings were supplied for it. Now I'm not sure what to do about not using shims, as the crank and bearings are matched. Are these '56 rods ONLY to be used with shims, or am i ok without them? have heard Dick L and others discuss this but its been a while. What can i do now if this is all wrong? Appreciate any help.

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Earl-IL

12-14-2013 12:36:29
50.81.209.158



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 Re: b-125 crank kit in reply to Tim Lockey, 12-07-2013 11:22:41  
.009 is the correct laminated shim pack from Federal Mogul. Mains & Rods.



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steve(ill)

12-09-2013 15:11:29
50.40.149.193



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 Re: b-125 crank kit in reply to Tim Lockey, 12-07-2013 11:22:41  
If the crank was turned to fit the new bearings, then you dont need shims on the rods... measure to make sure. YOu will still need shims on the main bearings as the block and caps were not line bored.



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Dick L

12-09-2013 16:05:58
50.51.157.14



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 Re: b-125 crank kit in reply to steve(ill), 12-09-2013 15:11:29  
Nope Steve. The big end of the rod is not round. The hole is only round with shims. You clamp and measure the old rod, before reconditioned, it will be wider than it is high.



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tim lockey

12-10-2013 19:38:15
24.74.223.67



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 Re: b-125 crank kit in reply to Dick L, 12-09-2013 16:05:58  
Thanks for helping me understand this Dick L checked w/ plastigage, way too tight, crank wont rotate, this with STD as new crank, and STD bearings. Where can i order the correct shims for both mains and rods? No AC dealers left in eastern NC. Thanks



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steve(ill)

12-12-2013 18:55:41
50.40.149.193



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 Re: b-125 crank kit in reply to tim lockey, 12-10-2013 19:38:15  
If the crank was "standard" and the bearings are "standard", then you will need about .006 inch of shims on each bolt. They sell .002 shims ( x 3) or like DIck said, you can cut you own. I have a brass sheet .002 thick and have made several. The shim goes around the bolt, but dont get it caught under the edge of the bearing.



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Dick L

12-11-2013 10:13:38
50.51.157.14



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 Re: b-125 crank kit in reply to tim lockey, 12-10-2013 19:38:15  
You can get them from Sandy Lake Implement and you might get them from this site. I cut my own from shim stock. Some cut them from pop cans.
The shim packs you get from a dealer would be easier for someone that has not done this before.



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Dick L

12-08-2013 06:49:03
50.51.187.192



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 Re: b-125 crank kit in reply to Tim Lockey, 12-07-2013 11:22:41  
Missed thinking about your question at first. Answer is you have not done anything wrong by having the crankshaft ground and bearing matched. That is all good with or without shims. If it had shims when you took it apart it will need shims to go back together unless you did as stated below. If it did not have shims when you took it apart you will need to mic the journals ID to make sure they have been reconditioned and the person working on it before put it together with out shims to take up the slack from wore out crankshaft and bearings.

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BushogPapa

12-07-2013 21:19:24
173.88.50.145



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 Re: b-125 crank kit in reply to Tim Lockey, 12-07-2013 11:22:41  
Mic the Crank journals and Bearings to see.

Ron.



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Dick L

12-07-2013 12:23:46
50.51.187.192



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 Re: b-125 crank kit in reply to Tim Lockey, 12-07-2013 11:22:41  
The only way not to use the shims would be to take the block and rods to the machine shop and have the block line bored for the main bearings to be used without shims. The same with the rods. That would be called having the rods reconditioned to use bearings without shims.

If this is not done you will need plastigage to check and shim to .002 clearance.



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