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jdemaris
02-11-2005 17:54:56
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Re: JD2020 help in reply to beeman, 02-11-2005 13:22:37
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The 2020 diesels don't come from the factory with valves seals although they are often added later. 2020 gas engines come with o-rings on the intake valve stems only. Bad seals, valve guides, etc. won't make the breather smoke like that. Bad seals, etc. will usually show up the most coming down a hill, especially if the transmission is holding the tractor back and the throttle is set low. Diesels usually don't have a throttle that cuts off air supply, thus the reason they don't come with seals (I have a diesel International that DOES have a air-throttle but it's an oddball). Bad seals will often cause smoke at first start up also, and then clear up and not smoke under load. Blowby out the breather is usually a cylinder-wall sealing problem, or excessive side piston side gap in the pistons, and according to some automotive engineers, badly worn main bearings (which I've never fully understood). If it were my 2020, I'd plan on pulling it apart somewhere down the road. But, if it holds good oil pressure at idle when it's good and hot, I'd use it. Chances are, when you do tear it down, besides the usual rod and main bearins, pistons, rings, and sleeves, that particlar engine is likely to need two balancing shafts - and changing them is not usually an "in frame" job (although it can be done).
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