Farmall M Transmission Leak

Jim R · May 22, 2010

I have a 1951 Farmall M Tractor. It has a pretty good drip, off and on, coming from the front seal in the transmission. I have just put fresh gear oil in the transmission. Is there any additive that I could add to the trans. oil to slow the leak or stop it, short of splitting the tractor and putting in a new seal. Thanks for any advise!

Anonymous-0 · May 23, 2010

I believe you're talking about the seal behind the coupler on the front of the transmission.If so, I would not trust any additive to slow or stop the leak. You need to replace the seal, and while you're at it, replace the seal that is behind the belly pump coupling. If it's a plain M, not a super, you do not have to split the tractor, but you do have to remove the belly pump, and the entire clutch assembly, (pressure plate, disk, and trans. shaft carrier) as that's the only way the trans. shaft will come out. ONce all that stuff is out of the way, you will have plenty of room to get the couplers off and replace the seals. I would also suggest that you rplace the pilot bearing and maybe even the clutch. To me it doesn't make sense not to replace these parts in a machine this old. Check the archives. LOts of valuable help here on dissassembly.

Jeff Z. · May 23, 2010

I had a transmission shaft seal seeping. I tried some Bar's Leaks rear main seal stop leak and the seal stopped leaking after around 3 weeks.
It's been over a year now and the seal does not leak.

There is also a product made by White Shepherd but I have never tried it.
Stop Leak

Farmall M Transmission Leak

Jim R

Member

Anonymous-0

Well-known Member

Jeff Z.

Well-known Member

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