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New Rings in an 8n

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RHKirk

01-12-2004 10:49:56




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I'm looking at a later model 8n to buy. It starts great and runs good. The guy that owns says he's only got about 5-6 hours on engine redo (rings, etc.) There's a little bit of smoke coming out and he says it is because it hasn't been run long enough for the rings to seat. Does this sound legit? I'm an engine novice so I don't know. The tractor looks great and it is a good price. Thanks for the help.

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rjohn

01-13-2004 07:06:00




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 Re: New Rings in an 8n in reply to RHKirk, 01-12-2004 10:49:56  
It also makes a big difference what kind of rings he used. If they were chrome it might never quite smoking. Iron rings seat a lot quicker. I would take a chance. Rjohn



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Rick H. Ga.

01-12-2004 12:52:37




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 Re: New Rings in an 8n in reply to RHKirk, 01-12-2004 10:49:56  
When I first started my newly rebuilt 49 8N engine it smoked for about 3 or 4 minutes and then had no smoke at all. After reading the archives about breaking-in newly rebuilt N engines, I re-torqued the head after a few hours of run time and then worked it hard plowing in my field with a two-bottom turning plow. After three years, still no smoke and plenty of power. HTH. Rick H. Ga.



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Rob N VA

01-12-2004 18:07:15




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 Re: Re: New Rings in an 8n in reply to Rick H. Ga., 01-12-2004 12:52:37  
I am right there with ya' Rick. I would think that if the cylinders were honed or replaced, it wouldn't smoke very much at all, for very long at all. I would ask the dude if he rebuilt it himself, or if someone else rebuilt it. I am selling an older car right now, and I wouldn't be a bit offended if someone stopped to look at it and brought a compression gauge.....but that's me----Rob



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Evil Steve

01-12-2004 12:02:26




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 Re: New Rings in an 8n in reply to RHKirk, 01-12-2004 10:49:56  
R-Kirk-

Yes, it is perfectly normal for her to smoke until the rings seat. Depending on usage, figure another 10-20 hours of run-time. However, as others suggest, I would want to see the receipts and interview him about his overhaul.

How long did it take? Did you mic the sleeves? Did you mic the rod and main bearings? If so, did you repace or reuse the bearings? If you reused the bearings, did you reinstall them in the same rod end/crankshaft locations thoe bearings came out of (VERY important). Many questions to ask...

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Dan

01-12-2004 11:45:06




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 Re: New Rings in an 8n in reply to RHKirk, 01-12-2004 10:49:56  
A simple compression check would definately show the difference between a tired engine rings and a new install I would think.

Dan



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Cap-N-ID

01-12-2004 11:04:29




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 Re: New Rings in an 8n in reply to RHKirk, 01-12-2004 10:49:56  
RH -- Could be legit but who knows ?? without a good checkout of all the possibilities. Ask to see bills for the parts etc. bought during the "overhaul". It's a fair request, and those bills, if he can produce them, would at least give you some idea of what might have been done, or left undone. With any piece of used equipment you buy, "what you sees is what you get".
(some may disagree) --Cap--

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Pitch

01-12-2004 12:08:55




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 Re: Re: New Rings in an 8n in reply to Cap-N-ID, 01-12-2004 11:04:29  
Yes an engine with that few hours on it probably would smoke some, but then then the guy could be lyin his butt off to you also. What does he mean by redone? I would ask for specifics and receipts. I would think that if the engine was completely rebuilt it would show some sign of "newness" Chipped paint,light orange surface rust on bolt heads, gsaket cement etc, new coil plugs wires,distributer. Go look at it again tell him you want it cold when you get there. Start it and run it 15 or 20 minutes thru its range of RPM.

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