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Allis Chalmers Discussion Forum
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Help with Model B bearings

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loveshisallis

01-21-2008 13:02:30




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I am planning a rebuild on my model B and notice that the mains and rod are offered in Std., .010. and .020 oversize.
So , not to ask a dumb question, does this mean that I have to tear it down, and measure these BEFORE I order the rebuild kit? And who is a good outfit to order from?
Thanks




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DARDAN

01-23-2008 22:52:30




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 Re: Help with Model B bearings in reply to loveshisallis, 01-21-2008 13:02:30  
I plastigage the bearings on a tear down, if they are not obviously shot. The few bucks gives me an idea of where I'm at and may let do a decent job without the cost of new bearings. These old slow speed engines will give decades of service without being "perfect".

JMS/.MN: You make an excelent point! Undersize bearings for a reduced size journal. Since 'mechanics' began these have been "undersize" bearings, and now even the retailers are calling them 'oversize'----go figger.

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old

01-21-2008 14:26:58




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 Re: Help with Model B bearings in reply to loveshisallis, 01-21-2008 13:02:30  
The best and only way o do an engine is to open it up first and have ALL the machine shop work done then and only then order the parts. Other wise you may end up with some if not all the wrong parts. Plus most machine shop can get you the correct parts and most of the time doing it that way saves you money also. Any time you rebuild and engine you should have the block hot tanked and also have the head done the same way and have it checked for cracks

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DiyDave

01-21-2008 13:21:32




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 Re: Help with Model B bearings in reply to loveshisallis, 01-21-2008 13:02:30  
Assuming the last rebuild of the tractor was done by a good mechanic, pull off 1 rod cap, and 1 main. Look at the back side of the bearing, and it will say if it is undersized, and by how much. A good mechanic will size them all the same. Also, If there are no knocks, and the bearings don't look or feel grooved, you may be able to just shim the existing bearings. If you see any traces of I.P. engineering, such as baling wire, or newspaper shims on a badly scarred bearing, or if you have bearing or rod knock, then you should do the full pull down first. Just remember what happens when you assume.

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Dieselkid

01-21-2008 13:20:10




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 Re: Help with Model B bearings in reply to loveshisallis, 01-21-2008 13:02:30  
Yes your best bet is to tear it down, and go from their. The crank may need to be turned. Pending on how it looks. If it does then you would have to go with the .10 or .020 under bearings ounce again pending on how much needs to be removed. Im going through this with my XT190 diesel. what i thought was going to be a easy rebuild turned into a major project, each time i find one problem thier is 4 trailing it!!! good luck.

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JMS/.MN

01-21-2008 13:17:19




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 Re: Help with Model B bearings in reply to loveshisallis, 01-21-2008 13:02:30  
Take the crank to a machine shop, determine wear with a micrometer, and have them turn it down accordingly, if needed. Then get the undersized bearing inserts to match. They are under, not over, the original dimensions- since you turn down the crank from the original dimensions. Get some plastigage to check the inserts when you install them.



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