'45 BN...transmission oil leak

Farmall B & BN Tractors, 1939-1947
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wjwolfe82
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Joined: Tue Apr 13, 2021 3:33 pm
Zip Code: 43050

'45 BN...transmission oil leak

Postby wjwolfe82 » Mon Apr 19, 2021 8:48 pm

It appears that fluid is leaking around the hole in the rear end that the brake lever passes through.
I searched the parts catalog and it looks like maybe the Differential pinion oil seal?
Major job?

leak.jpg
central Ohio

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Don McCombs
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Re: '45 BN...transmission oil leak

Postby Don McCombs » Mon Apr 19, 2021 10:11 pm

More than likely, the transmission is overfull. Probably has a combination of gear lube and water. When was the gear lube changed last?
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wjwolfe82
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Zip Code: 43050

Re: '45 BN...transmission oil leak

Postby wjwolfe82 » Tue Apr 20, 2021 7:57 am

Don McCombs wrote:More than likely, the transmission is overfull. Probably has a combination of gear lube and water. When was the gear lube changed last?


That's a good question. It's been sitting (inside a closed barn fortunately) for at least 7 years and most likely didn't get much tlc before that. Though the fluid that is leaking looks pretty good & clean.
Could be wrong, but I don't think it was leaking until after we moved(pulled) it.
central Ohio

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arlen
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Re: '45 BN...transmission oil leak

Postby arlen » Tue Apr 20, 2021 10:52 am

For what it's worth, my B was sitting inside for 7 or 8 years without running, and it was way overfilled with mostly water when I drained it.
The fluid would float on the water, and would probably be pretty clean where it decides to leak. I would definitely drain it before I worried too much.
I plan on refilling mine with 85-140, then re evaluating any leaks with the heavier oil.

wjwolfe82
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Zip Code: 43050

Re: '45 BN...transmission oil leak

Postby wjwolfe82 » Tue Apr 20, 2021 12:26 pm

arlen wrote:For what it's worth, my B was sitting inside for 7 or 8 years without running, and it was way overfilled with mostly water when I drained it.
The fluid would float on the water, and would probably be pretty clean where it decides to leak. I would definitely drain it before I worried too much.
I plan on refilling mine with 85-140, then re evaluating any leaks with the heavier oil.


Thanks for the info, I will do the same and give it good drain/refill and go from there.
central Ohio

wjwolfe82
Posts: 22
Joined: Tue Apr 13, 2021 3:33 pm
Zip Code: 43050

Re: '45 BN...transmission oil leak

Postby wjwolfe82 » Tue Apr 27, 2021 9:28 am

It was overfilled. No water thankfully but I drained almost 2 qts more that what it took to refill.
The check plug took some time to remove like it hasn't been out for a long time. I suspect it was previously filled with however much they 'thought' it needed.
I haven't moved it yet, but no drip now at all.
central Ohio


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