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Tool Talk Discussion Forum

Crank pins

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Glen2

08-24-2005 18:32:03




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Hey; some of you restoration guru's. I bought a tractor the other day that the engine has been left out in the open for some time. The crank pins have a fine surface rust on them, how is the best way to get them polished without taking off some metal? thanks in advance




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BigMarv1085

08-25-2005 08:49:38




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 Re: Crank pins in reply to Glen2, 08-24-2005 18:32:03  
I would take some of the white scotchbrite (fine) soaked in some solvent and polish the crank like polishing a shoe. Then finish with corcus cloth. Niether one of these will damged a part by removing metal.



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Mike M

08-25-2005 06:20:38




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 Re: Crank pins in reply to Glen2, 08-24-2005 18:32:03  
Some wd40 or kerosene and some 120 emery the width of the journal spun slow in a lathe will do wonders for a rough or rusty crank.



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Bob

08-25-2005 07:53:38




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 Re: Crank pins in reply to Mike M, 08-25-2005 06:20:38  
120 grit on a CRANK JOURNAL? YIKES!

Any automotive machinist I have ever known would have a STROKE over that!

A crank journal needs to be POLISHED to the point where your fingernail will glide smoothly across it without catching, and a (real) copper penny won't leave a mark when drawn across it.

You ain't gonna get a finish like that with 120 grit!



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Mike M

08-25-2005 08:21:34




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 Re: Crank pins in reply to Bob, 08-25-2005 07:53:38  
I sure do. I've even tried that penny trick. The grit breaks down on the emery and ends up finer than rated (this is a cheap eneric brand).I don't do this on car engines only old JD's. High speed engines are too fussy they need to be sent off and made perfect.



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Bob

08-24-2005 18:45:48




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 Re: Crank pins in reply to Glen2, 08-24-2005 18:32:03  
The ONLY thing to use on journals is CROCUS CLOTH. Use a little light oil or diesel fuel with it.

If the rust is too bad to be polished off with the crocus cloth, the crank will need to be ground, or replaced.



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