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Serious Oil Leak

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Alan M. (Va.)

06-13-2001 18:43:31




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My '49 8N has a serious oil leak from the front end of the crankshaft. I have a new seal, but before I start this job during this busy season, I would appreciate it if someone could give my an idea of what I will be getting into before I start this job. Should I be able to pull the top half of the old seal and install the new one from the bottom by just removing the oil pan? Someone has suggested that the problem could well be worn grooves in the crankshaf pully where the seal is. If that turns out to be the case, will I be able to remove the pully without tearing down the front of the tractor to gain access? Any suggestions or thoughts on this will be much appreciated. Thank you.

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TimK

06-14-2001 09:29:45




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 Re: Serious Oil Leak in reply to Alan M. (Va.), 06-13-2001 18:43:31  
I believe it was Zane who once said that you could buy a seal replacement for a Ferguson TO-35 that was a rope mesh that you could pound into the top groove without pulling down the crand. You may want to check that with Zane. But....if the pulley is badly grooved, no matter how good the rope seals are, chances are it will leak. You have to pull off the front end to get to the pulley (not really that big a job). Then renew the pulley by welding or sleeving it and correcting for runout if needed. Get yourself an Fo-4 manual, you'll find it very useful. My $.02

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raytasch

06-14-2001 08:44:55




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 Re: Serious Oil Leak in reply to Alan M. (Va.), 06-13-2001 18:43:31  
Many years ago when I had much more time than money I successfully worked a thin piece of metal between the rope seal and the seal channel. This, of course, takes up space and gives new pressure on the rope seal. My modification was on a stovebolt Chevy but it should work on the N. The metal should be narrower than the seal mount and less than .010" thick. A feeler gauge blade would work. Easier than dropping the shaft and/or trying to work a new seal around the shaft. Be absolutly sure the seal is where your leak is before you tear down.
fwiw, ray

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llamas

06-14-2001 05:06:51




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 Re: Serious Oil Leak in reply to Alan M. (Va.), 06-13-2001 18:43:31  
If the problem is confined to wear on the crank pulley seal surface, yes, you can pull this without having to remove the pan and crank - if you can get the big bolt on the front of the pulley off. This can be - challenging. The new pulley will slide right in.

If the seal is bad, you may have more work to do. It's a "rope" seal, in two halves, that need to be fitted and trimmed in place. Some folks have reported success in removing the upper half and sneaking in the new seal without removing the crank. I'm not that good, myself. But is is a fact that, with the pulley removed, you do have some working room and if you really, really don't want to drop the crank, you may be happier installing the seal half this way. If I ever have to try and do this again, I think I will make a curved tool of some sort that reaches in there to press the seal in place.

HTH

llater,

llamas

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Martin D.

06-14-2001 07:06:48




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 Re: Re: Serious Oil Leak in reply to llamas, 06-14-2001 05:06:51  
There used to be a tool available to help change the top half of the rope seal without dropping the crank. Itwas called "A Sneaky Pete". I have never used one, but I am sure they still are to be found at auto tool shops.



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