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1950 8N

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Greg from Kansa

07-27-2000 19:12:55

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I have a 1950 8N with a broken piston. It appears that the ring broke and caught the sleve and pulled it down. I am wondering whether to do a complete overhaul or just replace the broken piston. It has been about 35 years since the last overhaul on this tractor. It does not see hard use but I do use it for some brush hoging. Also what can I expect to spend on this overhaul. Thanks Greg

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Fred OH

07-28-2000 08:21:40

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Re: 1950 8N in reply to Greg from Kansas, 07-27-2000 19:12:55

Looking at last years book (1999) the complete kit to overhaul your tractor (if it don't have to be rebored would be in the neighborhood of $250 plus shipping. That includes everything to rebuild the block, no oilpump or valve work. But does include gaskets. They are as cheap to overhaul as a Chevy V8. Have someone mic your crank so you can get the right bearings. Better get a oilpump rebuild kit too ($45) And lap the valves in yourself, if they don't look too bad. You can get a free catalog at C&T 1-888-8CT-FARM
L8R----Fred

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ZANE

07-28-2000 05:41:23

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Re: 1950 8N in reply to Greg from Kansas, 07-27-2000 19:12:55

Since the tractor is a 50 model it probably has the thin steel sleeves and what may have caused the failure is that the sleeve was cut through enough for the ring to hang the sleeve and pull it down. If the sleeve did not cut through in any place then the sleeve must have come loose in the bore. It is a press fit. .005 inch interference fit. Or the sleeve is supposed to be .005 bigger on the OD than the cylinder ID.

If the sleeves are the thin .040 ones and the new sleeve will fit nice and tight the .040 will be OK to replace with. If however the .040 sleeve was loose in the bore it may be necessary to go with the .090 sleeves and to use them it will be necessary to rebore the block to take them.

In my opinion the .040 sleeve is a good as the .090 if the bore is still in good shape to receive them.

I would definately replace all the sleeves and pistons. After all they are all four the same age.

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Old George

07-28-2000 06:04:03

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Re: Re: 1950 8N in reply to ZANE, 07-28-2000 05:41:23

Dr. Zane,
I am perplexed. I would swear that I have read over and over on this board and in the archives that the .090 cast iron sleeve is preferable to the .040 sleeve. Now I see you say the .040 steel is just as good as long as the bore is in good shape. Would you elaborate? I have a very high regard for your opinion and it would save some money to not have to bore the block on this 2N. Thanks in advance!
Alan Esch
45 2N 183513

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Sam (Mo.)

07-27-2000 21:48:30

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Re: 1950 8N in reply to Greg from Kansas, 07-27-2000 19:12:55

I'm not a mechanical expert, but in my opinion, once you're that deep into it you might as well do the overhaul.

You're going to have to take it apart anyway to fix the one piston and sleeve. At that point, it's not so much more work to do the whole thing - and then you're probably good for another 35 years or more!

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