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Discussion Forum

Crankshaft seals for 2N

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Lyle Oakes

03-07-2000 15:08:14

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I want to thank you all for the help I needed about the clutch sticking and not disengaging. It had oil on the disc. It was the rear main seal of the engine that was leaking. Now my problem is that I have two I&T shop manuals and one says I can replace both front and rear seals,the top half without removing the crankshaft. The other manual says you have to drop the crank to get the top half in. Does anyone know for sure if you have to drop the crank or not. Thanks to all

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03-07-2000 20:19:37

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 Re: crankshaft seals for 2N in reply to Lyle Oakes, 03-07-2000 15:08:14  
To replace the top rear main seal it next to impossible to remove the old one or install the new one with the crankshaft in the engine. The old one will be stuck to the seal retainer because it is aluminum and you know what that stuff does when it is mated to a dissimilar material for a long time. You may also have too much wear on the crankshaft rear journal to ever stop the leak without an engine rebuild and crank regrind.
There is however a way to repair the rear main seal without removing or replacing it.
The TO Ferguson tractors have a cotton roping seal at the top rear main seal. It is a soft loosely woven rope about the size of a pencil or so and it is installed by simply using a soft punch to pack it into the top seal retainer. First you use the soft punch to pack the old seal up into the retainer as far as is possible before starting to pack in the roping. Using a soft punch made of a welding rod etc and being careful not to strike the crankshaft and score it pack the cotton roping into the seal retainer behind the old seal until no more can be packed in. Do this on both sides of the top seal.This will make the old portion of the seal again come in contact with the sealing surface of the crankshaft and then just install a new half in the bottom and bolt on the bearing cap.
I have done this repair many times in the past and never had a leak. The cotton roping is all that the new TO Ferguson tractors ever had from the factory. The engine in them is a Contenintal engine.

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Drew in CT

09-03-2001 11:06:22

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 Re: Re: crankshaft seals for 2N in reply to ZANE, 03-07-2000 20:19:37  
Hi Zane, I appreciate your expertise on this site. I have an NAA with sticking clutch. I split the tractor today and found motor oil in the clutch/throwout bearing compartment. I'm sure it is coming from the engine and not the trany. I guess I need to fix the rear main seal before replacing the clutch. Do I dop the oilpan for your "fix"? Should I pull the engine for the top seal? Does this apply to an NAA as well?

Thank you, Drew in CT

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03-08-2000 07:35:26

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 Re: Re: crankshaft seals for 2N in reply to ZANE, 03-07-2000 20:19:37  
Zane's comments are good. However, if you do decide to pull the crank, make sure you take out the rear oil seal retainer aluminum ring piece and permatex it well before you install the seal.

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