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Ford 9N, 2N & 8N Discussion Forum
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pistons and rings

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Ron Watkins

09-14-2006 17:19:42




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My granfather purchased a 9n tractor in 1944,Serial#9n129984. I am currently trying to overhaul the motor. In the original owners manual the cylinder bore is stated at 3.1875" to 3.1885".
I have pulled the pistons and miked them and they mike at 3.280". I miked the cylinder bore and it comes out at 3.30". The piston has a 'S' stamped on it and also '100' stamped on it. It does not appear to have a sleeve in the cylinder bore. I have a couple of questions to be answered.
1. If the tractor was rebuilt at 1 time, does anyone know if they would have pulled the sleeve and bored over a .100 and put in a oversized Piston?
2. And if so, where can I get new pistons and/or new rings?
The tractor is in overall good shape.It appears also to have a valve replaced becase one is not marked with the ford emblem. Any help would be appreciated. Thanks Ron Watkins

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Hobo,NC

09-15-2006 08:14:01




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 Re: pistons and rings in reply to Ron Watkins, 09-14-2006 17:19:42  
I have .366 in my notes but that would be up to the machinist to figger a .001 interference fit. The info to use the .090 sleeve izz correct, go with the .090 sleeve and it will be better than new. Their are quite a few V8 flatheads runing around with .090 sleeves used in a N, a poor boys way to save a buck when rebuilding a worn V8 block



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Dell (WA)

09-15-2006 07:54:59




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 Re: pistons and rings in reply to Ron Watkins, 09-14-2006 17:19:42  
Ron..... ...JimTN has the right answer. Uncommon hoprod trick to pull sheetmetal sleeves and use flathead V-8 pistons in castiron block for MORE POWER. Problem is the cylinder holes wear and you must bore them round and straight again. And then try and find pistons and rings to fit. It can be done $$$ But the real and I think best solution is to have a machineshop re-bore the block to fit the thicker castiron sleeve and use standard pistons and rings.

Think about it, both Henry and Harry were cheap. They wouldn't have specified replaceable sleeves iff'n it didn't improve the tractor. Its not uncommon to find some agricultural areas where engines needed rebuild EVERY YEAR due ingested dust grinding the rings and cylinder holes. Castiron engine block is usually only good for 1-rebore and then scrap-pile. Replacable drysleeves, engine block lives forever ..... ...Dell

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Duner Wi

09-15-2006 05:50:39




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 Re: pistons and rings in reply to Ron Watkins, 09-14-2006 17:19:42  
Another option would be to bore it to 3.367 inches and use the late 8N .090 cast wall sleeves and pistons.



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Bob Harvey

09-14-2006 20:00:09




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 Re: pistons and rings in reply to Ron Watkins, 09-14-2006 17:19:42  
It may sound too simple, but, check out engine rebuild kits on this site, they are comprehensive and complete, AND, the best part...
inexpensive.



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JimTN

09-14-2006 18:38:25




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 Re: pistons and rings in reply to Ron Watkins, 09-14-2006 17:19:42  
3.30 is awful close to 3 5/16 which was a common big bore for flathead 100hp v8s. If the sleve holes have been bored out or worn out that far.... a little clean up might get it to 3 5/16 and a 1/2 set of v8 pistons and rings would work. Realize there are those much against big bore but if I was that close, I would give it a try. Sure helped the V8s back in dirt track days!



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old

09-14-2006 18:24:06




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 Re: pistons and rings in reply to Ron Watkins, 09-14-2006 17:19:42  
As per your serial number you don't have a 9N but you have a 1944 2N. Almost the same tractor but not the same tractor. Other then that I can't help just letting you know that its a 2N not a 9N



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