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Seeking advice on rod bearings

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roperboy

07-16-2001 14:34:09




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my crank is at machine shop and they ground it and said the rod bearings i need are .060 under and the mains are .040. my concern is the rod bearings. he ordered the bearings but the more i think about it the more uncomfortable i am. he seems to think it will be ok. what do you guys think? will it last ok with the .060 bearings?




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ferrell freeman

07-16-2001 19:24:54




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 Re: seeking advice on rod bearings in reply to roperboy, 07-16-2001 14:34:09  
When I,first started rebuilding engines over thirty two years a go no wanted a crankshaft less than 10/20 . But as time went on and several thousand engines later I, have learned if you are a good mechinist or have a good one the limits to .060 ,but the crankshaft must not have any other flaws .



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Al English

07-16-2001 18:48:46




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 Re: seeking advice on rod bearings in reply to roperboy, 07-16-2001 14:34:09  
Hi roperboy,
The area where the bearing journals transition to the cheeks of the crank are called fillets. This area of the crank is highly stressed. If the radius in these fillets is ground correctly the .060" undersize is not an issue in this type of engine. However, for reasons of expediency and stone life, many crank grinders reduce this radius, or mess it up completely. While it doesn't always happen, a crank with improper fillets is much more likely to crack than one with correctly ground fillets. As with most things, a good job is better than a quick and dirty one. Good luck...Al English

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Bill W.

07-16-2001 17:44:11




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 Re: seeking advice on rod bearings in reply to roperboy, 07-16-2001 14:34:09  
Roperboy: my pitiful 8n is at the machine shop even as we speak getting .060 main and rod bearings. My mechanic says its no problem; done every day, 060 bearings are just a little harder to find. My other expert tractor friends, including this board's infamous(?) Zane agree that crankshaft properly ground, a .060 bearing will last as long as you or I will. Anyway its a thicker, heavier bearing, better able to stand the load as long as your lubrication system is functioning properly. I wouldn't worry about it as long as you have confidence in your machinist.

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ZANE

07-16-2001 18:13:13




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 Re: Re: seeking advice on rod bearings in reply to Bill W., 07-16-2001 17:44:11  
What Bill said!



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smokie

07-16-2001 17:09:36




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 Re: seeking advice on rod bearings in reply to roperboy, 07-16-2001 14:34:09  
if you cant trust your machinest hoo can you trust.
it tells me ether your crank was real beat up or it has been turned before it should be ok i dont think how ever you will be able to turn it again but then of course you are rebuildin so it should out live you anyway..
goodluck



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