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John Deere 820 again

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Lyn Jones

02-08-2003 11:05:34




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Hi.
I'm in the process of fitting new rings and big end shells in my 1957 JD820. Whilst the tractor is stripped down, I am thinking of replacing the crankshaft oil seals. However, the parts book does not show an oil seal on the flywheel side, but a rubber packing and an oil slinger. Can any of you experts explain to me how an oil slinger works, and keeps the oil inside the cranckase. Should I be replacing any other seals at this time to avoid future problems?
How difficult is it to replace the oilseal at the clutch end of the pony motor? I do seem to have an oil leak from that area.
Regards from Wales.

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Clooney

02-08-2003 12:04:51




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 Re: John Deere 820 again in reply to Lyn Jones, 02-08-2003 11:05:34  
Lyn, while I'm far from an expert on the 820... The oil slinger works the same on an 820 as most other engines that use one. In simple terms it acts like a rotating disk placed on the crankshaft [& sealed to the crankshaft with a packing] to spin away any oil that contacts it. It functions only if the spun off oil has a place to drain back into the crankcase [drain hole MUST be open] & only if the amount of oil it has to deal with isn't excessive. If there is a worn bearing allowing too much oil to enter the slinger area, or there is high crankcase pressure due to blow-by or a plugged crankcase vent a slinger won't stop all the oil. It's only real purpose is to keep oil from running along the crankshaft & out of the engine. To get by the slinger the oil must run around the slinger & it can't as the slinger tosses it off before it can get around the end. If you aren't going to pull the timing cover off the engine just replace any gaskets you see that have been leaking.
~On the pony rear seal, that is a common problem.The seal can be replaced by pulling the transmission, clutch, & flywheel, then using a small screw or two to thread into the seal & pull it out using vise grips & a small prybar. I have found it easier to pull the end cover as that allows the crank to be measured & bearing checked for wear, [watch that thrust washer so it gets lined back up when the covers put back on, I use grease to hold it in place].....

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Lyn Jones

02-09-2003 08:47:51




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 Re: Re: John Deere 820 again in reply to Clooney, 02-08-2003 12:04:51  
Many thanks for that very comprehensive reply Clooney. It's the first time that I have worked on a JD 2 cylinder tractor, so I'll probably be back with more questions.



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