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John Deere Tractors Discussion Forum
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Pony Motor Valve Guides

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BLinWMi

02-18-2008 17:22:46




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Has anyone had problems getting new guides put in and reamed to the correct clearance? They have to be.246-.247 in. My pony has good compression, cylinders are all from 120 to 132 lbs. I know this is over the 120 they are supposed to be but my pony for some reason turns a bit faster than specs, my hand tach has it turning about 6000 Rs if I remember right. I feel the compression is ok but it smokes like a chimney and uses oil. So next thought is the valve guides need to be replaced.

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Duane(Pa)

02-19-2008 19:11:47




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 Re: Pony Motor Valve Guides in reply to BLinWMi, 02-18-2008 17:22:46  
If you get into it, I had a machineist(SP?) make me all new guides from bronze.(less than new from deere)That, and a set of rings and no more smoke. See a motorcycle shop, they have plenty of small valves in that industry and can fix you up with an awesome valve job. I love ponies, especially in this kind of weather!



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Mike M

02-18-2008 18:56:57




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 Re: Pony Motor Valve Guides in reply to BLinWMi, 02-18-2008 17:22:46  
It's been alot of years since I did some of those,but I don't recall anything special about the guides. I likely made a driver or used a 1/4" bolt and nut ? and drove them out and in. Reaming may not be needed as the guides are presized. I do think that is what cleared up our pony motors smoke. I also remember having some trouble getting small enough stuff to grind the valves. I had to do some special reworking of a stone to fit in there.

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F-I-T

02-18-2008 18:00:54




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 Re: Pony Motor Valve Guides in reply to BLinWMi, 02-18-2008 17:22:46  
Have you checked for an ocluded drain hole in the heads? Those holes are pretty small and it doesn't take much to stop one up. The valve gallery fills with oil and they will smoke and burn oil like crazy.



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