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Ford 9N, 2N & 8N Discussion Forum
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2N rebuild advice request

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Pat Kenney

02-22-2005 19:06:03




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I have a 2n that I'm rebuilding and I have a question regarding the crank bearings. Both the main and rod journals measure small, mains are ~.018" small and the rods ~.033" small. I plan to have the crank dims checked by a shop but I notice that the replacement bearing kits seem to come in .010 increments. Should I order the .040 oversize bearings and have the shop grind the crank to fit?




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lumpy

02-22-2005 19:57:08




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 Re: 2N rebuild advice request in reply to Pat Kenney, 02-22-2005 19:06:03  
If you are going to have a engine machine shop grind your crank, why not just let them supply the bearings to go with it. That is what I have done in the past. That way there is no question on wether or not things will go together properly.



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Bob

02-22-2005 19:37:38




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 Re: 2N rebuild advice request in reply to Pat Kenney, 02-22-2005 19:06:03  
Have the shop grind the crank to the minimum undersize needed to true it up, and THEN order the bearings.

There's no reason to grind the mains to .040" U.S. if they will clean up at .020" or .030" U.S.. (It is common for the rod and main bearings to be ground to different undersizes.)

By going only the minimum amount, there will be metal left if another regrind is ever needed in the future.

And you'll want to order UNDERSIZE bearings, NOT oversize bearings!

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Dan

02-22-2005 19:44:27




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 Re: 2N rebuild advice request in reply to Bob, 02-22-2005 19:37:38  
Ummm - if he grinds his crank diameter smaller - wouldn't he want OVERSIZED bearings...

Dan



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Bob

02-22-2005 20:04:50




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 Re: 2N rebuild advice request in reply to Dan, 02-22-2005 19:44:27  
By convention and tradition, bearings for a reground crankshaft are called "undersize".

That's standard trade terminology, not mine.

Makes sense, their I.D. is SMALLER or UNDERSIZE.



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TIMW(PA)

02-23-2005 05:17:35




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 Re: 2N rebuild advice request in reply to Bob, 02-22-2005 20:04:50  
you're right I think. Somthing that is confused is calling the bearing races....bearings. The bearings are the actual crank right? And the bearing races would be the "oversized" inserts for the "undersized" bearings. It is all semantics but it helps if we know what side we are talking about



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Dan

02-22-2005 19:36:24




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 Re: 2N rebuild advice request in reply to Pat Kenney, 02-22-2005 19:06:03  
I recommend taking it to a good machine shop first, have them measure it, then tell you what size bearings to order.

Good luck with the rebuild,
Dan



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