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Minneapolis Moline Tractors Discussion Forum
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clearence on front main

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roger hinton

01-16-2006 19:48:03




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Unable to find information on front main of my RTI
What should be the maximum clearence I should have if I was to put a dial indicator on the front main then move the crankshaft up and down?




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yonson

01-21-2006 09:27:24




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 Re: clearence on front main in reply to roger hinton, 01-16-2006 19:48:03  
No substitute for planning & prep, can't be too careful when installing bearings as some can be spendy. Split the old bearing race (makes a good bearing driver) & use it for practice: heat with a propane torch (poor man's secret weapon), keep it moving to heat evenly, not too close. Turns blue, it's way too hot, I wouldn't go more than 300 degrees. Weld supply stores have heat sticks that melt at specific temps, they're not cheap anymore either. Practice runs with the old bearing will help you figure out what works, a split bearing will slide right off again. Hope this helps, lots of tricks to pick up along the way. RW

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yonson

01-19-2006 09:56:38




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 Re: clearence on front main in reply to roger hinton, 01-16-2006 19:48:03  
Hard to find tolerance info on straight (cylindrical) roller bearings but my ZA Dealers Shop Manual (1951) says main & rod bearings should not be worn, tapered or out-of-round more than .005, seems like that should also apply to the roller bearing. As a former machine tool rebuilder, we often made use of grinders to facilitate bearing shell removal on hard-to-remove bearings, grinding mostly through one wall & the bearing would loosen. Extreme caution in safety for both man & machine go without saying. Cheers. RW

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roger hinton

01-20-2006 14:57:21




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 Re: clearence on front main in reply to yonson, 01-19-2006 09:56:38  
yonson, Do you have any advice on putting the new bearing race on the crankshaft. Is there a temperature threshold on placeing the new bearing on the crankshaft?



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Kelvin

01-17-2006 09:22:49




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 Re: clearence on front main in reply to roger hinton, 01-16-2006 19:48:03  
Roger, That is a straight roller bearing and I have never seen a spec on the clearance.



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roger hinton

01-17-2006 14:25:43




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 Re: clearence on front main in reply to Kelvin, 01-17-2006 09:22:49  
I have put a dial indicator and had .010 movement
I would think this is too much but I'am not familiar with a roller bearing on the front main but with a bearing this big maybe it's not. But I would think that .001 to .002 would be acceptiable tolerance.



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Kelvin

01-17-2006 17:30:42




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 Re: clearence on front main in reply to roger hinton, 01-17-2006 14:25:43  
I would think that .010 is too much also. If it holds together it will be noisy.

You need another bearing. Its a Bower MA1212EL.



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roger hinton

01-18-2006 11:37:54




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 Re: clearence on front main in reply to Kelvin, 01-17-2006 17:30:42  
Thanks Kelvin part numbers are your best friend when going to the parts store. Any Idea on how to remove the bearing race from the crankshaft?



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