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Farmall & IHC Tractors Discussion Forum
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Clearance?

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FarmallFarris

12-10-2007 20:28:48




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I am a tool and die maker. Precision measurements put food on my kids table. Lately I have personally made a lot parts for my 1952 Super M on a Mazak CNC mill and other various equipment. While trying to make a new bushing for my worn steering shaft support, I became uneasy about what "Clearance" actually means. I consulted with my service manual on engine main bearing clearance with no avail. If I were to say that the clearance spec. is .002, does that mean .002 per side with a total of .004, or does that mean .002 with a total of .001 per side?

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FarmallFarris

12-11-2007 14:08:16




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 Re: Clearance? in reply to FarmallFarris, 12-10-2007 20:28:48  
Thanks guys for the info. Ill be finish reaming that bushing this weekend!



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El Toro

12-11-2007 05:43:56




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 Re: Clearance? in reply to FarmallFarris, 12-10-2007 20:28:48  
That means .001" clearance on each side of the shaft if it calls for .002" clearance. If you need to bore a .750" hole for a 3/4 " shaft and it requires .002" clearance the hole needs to be
bored at .752". Hal



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Andy Martin

12-11-2007 04:28:24




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 Re: Clearance? in reply to FarmallFarris, 12-10-2007 20:28:48  
When you use plastigage to check journal bearing clearance it definitely is total clearance.

But the guy putting 0.030 bearings on a 0.040 crank main will probably shim 0.010. Presumably he will do this on one side only and raise the crank by 0.005. I noticed lot's of folks reminding him to keep the oil hole open but if he only shims the cap he should be OK. 0.005 shouldn't affect his gear clearances appreciably.

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Wardner

12-10-2007 20:58:00




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 Re: Clearance? in reply to FarmallFarris, 12-10-2007 20:28:48  
It means "what feeler gauge will slide in the annular space". Don't multiply that measurement by two.

It's kinda like using a boring bar on a Bridgeport. If you dial in 15 thousands on the next cut, the hole will be 0.015" bigger. Not 0.030" bigger.



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RedNeckSuperC

12-10-2007 20:52:26




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 Re: Clearance? in reply to FarmallFarris, 12-10-2007 20:28:48  
I agree with Dave
As a Millwright, we use total clearance when we measure a bearing.
I hope this helps.



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Dave S.

12-10-2007 20:49:53




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 Re: Clearance? in reply to FarmallFarris, 12-10-2007 20:28:48  
It means .002 total .001 per side



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