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Farmall & IHC Tractors Discussion Forum
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How deep to cut a crank

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biggerred

01-02-2006 16:26:15




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Parted out a 48 M and noticed the crank was turned 30/30. Old crank is smooth as silk, but I was wondering just how deep is too deep to turn a crank. Im working on one for me now that had never been turned.(standard IH incerts)




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Merlin

01-03-2006 05:31:01




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 Re: How deep to cut a crank in reply to biggerred, 01-02-2006 16:26:15  
Both ways sound logical and I"m not saying either way, but I have always heard and used the terminology "over sized" bearing and/or piston. Thats because if the crank was ground .010, it would be undersized and the bearing would have to be .010 over sized to take up the slack.



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MN Scott

01-02-2006 16:28:54




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 Re: How deep to cut a crank in reply to biggerred, 01-02-2006 16:26:15  
In my engine parts supply book they list .060 over size bearings for some gas engines.



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Janicholson

01-02-2006 17:14:08




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 Re: How deep to cut a crank in reply to MN Scott, 01-02-2006 16:28:54  
Not all cranks are created equal.
Most old IH/Farmall cranks are able to be turned till the correct undersized inserts are no longer available. As stated in some cases .060".
Other cranks are Nitrided, or hardened, or made from material that does not "turn" well.
so there is no single answer.
If a crank is unique or from a low production engine , and not available, they can be welded up straightened, and "made new" But this is $$$$
JimN

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Bob

01-02-2006 17:07:23




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 Re: How deep to cut a crank in reply to MN Scott, 01-02-2006 16:28:54  
That would be UNDERSIZE.

Pistons for a rebored engine are OVERSIZE, bearings for a reground crank are always UNDERSIZE.

The crank journals get SMALLER when ground, hence the term UNDERsize.



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MN Scott

01-02-2006 18:21:32




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 Re: How deep to cut a crank in reply to Bob, 01-02-2006 17:07:23  
I have to disagree with you. The crank jurnal is ground undersize so that is called undersize but the bearing inserts are called oversize as they are thicker than the stock ones. Just look in any engine parts book and the bearing inserts are refered to as .010, .020 or whatever oversize.



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El Toro

01-02-2006 19:03:10




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 Re: How deep to cut a crank in reply to MN Scott, 01-02-2006 18:21:32  
Any insert bearing that's used on a crankshaft that had has been ground undersize is called undersize too. Even though they're thicker. Hal



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MN Scott

01-02-2006 20:23:47




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 Re: How deep to cut a crank in reply to El Toro, 01-02-2006 19:03:10  
Here is one example of oversized bearings.



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El Toro

01-03-2006 03:38:17




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 Re: How deep to cut a crank in reply to MN Scott, 01-02-2006 20:23:47  
Call your local auto machine shop and ask them.
That link you posted is wrong too. Hal



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Allan in NE

01-03-2006 02:16:27




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 Re: How deep to cut a crank in reply to MN Scott, 01-02-2006 20:23:47  
Scott,

You've got that wrong.

Doesn't matter if the insert is four feet thick or if it is fifty thousandths, it is still the diameter of the throw that is being measured and fit.

Also, never go by what ya read on the Internet; the guy that built that webpage in your link doesn't know what he's talking about.

Allan



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