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To turn crankshaft or not to turn

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Dave

03-25-2002 16:58:05




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I am in the process of re-assembling a W6 standard I bought last fall as a "tractor in a box". I've pulled all the pistons and I am looking at the crankshaft journals. They all seem to be in decent shape, no heavy scoring or other scarring. There are some very fine lines around the journals, but nothing I can feel with a fingernail or the edge of a thin piece of brass. The number 3 journal has one very slight groove around it. My fingernail can lightly feel it as I pass over it, but it doesn't catch. Also there is no rust or any other rough surfaces on the crank journals. All the con rod bearings were tight. Should I pull the crank and have it turned or will I be ok to re-assemble as it is? Thanks.

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Dave C.

03-26-2002 07:04:00




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 Re: To turn crankshaft or not to turn in reply to Dave, 03-25-2002 16:58:05  
Dave, there are three areas of concern when it comes to cranks. 1. Are the journals smooth? Yours sounds like it is. 2. Are the journals round?. The only way to really tell completely accurately is to chuck the crank up in a turning lathe and put a dial indicator to it. It should be round within .0003". Since the bearing to journal clearance is about .0015" to .002" that doesn't leave a lot of variance. 3. Is the crank straight? Again, you chuck the crank up in a lathe and put a dial indicator on the main journals. There shouldn't be any more than .001" runout on the crank itself. Other things to think about. Is the crank cracked? You may not be able to see it, but a magnaflux will show it up. Are the areas where the seal or seals run worn. You may have to have those areas dealt with so that the seals don't leak excessively. Since we don't turn tractor engines as fast as we do cars or truck engines these factors aren't as absolute as you would believe, but they are still very important. Also be aware that cranks are made out of Cast Nodular iron most of the time, so they are very soft. You can ruin a crankshaft very easily with a sharp tool. They should always be stood up on their flywheel end and kept away from any moisture where they can get surface rust on the journals. Good luck with the engine!!!

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RedTed/MO

03-26-2002 05:28:40




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 Re: To turn crankshaft or not to turn in reply to Dave, 03-25-2002 16:58:05  
Dave: Good ideas here. Six weeks ago I paid $55 to have a crank turned. With everything I'd already put in above it, seemed like a wise investment. Honkey's question is important: what've you got in mind for this tractor when you're done? Good luck. RedTed/MO.



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Honkey

03-25-2002 18:41:07




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 Re: To turn crankshaft or not to turn in reply to Dave, 03-25-2002 16:58:05  
Hi Dave,
If it was mine, I'd plastigauge it. If it was in spec., which it probably will be by the sound of it, and doesn't show any taper. I would leave it as it is. If you can't catch your fingernail on it, then I wouldn't worry about it.

I have a 560gas that has a rough journal in it. Overhauled it last year. Did'nt have the time to pull the crank and grind it. I needed it bad. Does it bother me? No. I know that bearings are replacable parts. Maybe down the road when I have more time or I have it apart for the clutch I might think about taking it out and turning it. Bottom line is what do you want to do with your tractor?

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Russ

03-26-2002 06:39:16




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 Re: Re: To turn crankshaft or not to turn in reply to Honkey, 03-25-2002 18:41:07  
Good to hear some shade tree logic!



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Steven@nd

03-25-2002 17:56:12




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 Re: To turn crankshaft or not to turn in reply to Dave, 03-25-2002 16:58:05  
For $84 I am having my H crankshaft cut .010" After putting a $600 overhaul kit in it, why not cut the crank and be sure? All told I will have around $1750 in my 42 Farmall H. BUT can you buy a new tractor for $1750? (Yes, I know, a lawn tractor maybe)

If I were you I would at least mic it and if it is out of spec, cut it.

Steven



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Russ

09-12-2004 11:27:57




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 Re: Re: To turn crankshaft or not to turn in reply to Steven@nd, 03-25-2002 17:56:12  
Steven or Others: We have a 1949 Farmall Super A
S/N AAK272910. THE MIKE READINGS ARE AS FOLLOWS:
CYL 4 1.7290
CYL 3 1.7283
CYL 2 1.7296
CYL 1 1.7291
IS ANY JOURNAL GRINDING NEEDED AND COULD WE JUST REASSEMBLE WITH ORIGINAL BABBITT SIZING?



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Red Raider

03-25-2002 17:40:12




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 Re: To turn crankshaft or not to turn in reply to Dave, 03-25-2002 16:58:05  
Standard practice is to mic the journals, in two positions perpendicular to each other (could be oblong), then see how far they are out of spec. Grinding a crank is not expensive at around $80 for a four cylinder, or lately had a 6 cylinder SD220 crank done for $125.



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mike

03-25-2002 17:22:04




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 Re: To turn crankshaft or not to turn in reply to Dave, 03-25-2002 16:58:05  

you can try using plasti gauge.its available at most auto parts.very simple to use & will show you what uyou want to know.good luck



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