Leaking Rear Main Seal

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Baxter28
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Tractors Owned: 1953 F-Cub Serial No. 160499JL

Leaking Rear Main Seal

Postby Baxter28 » Mon Jul 23, 2018 3:24 pm

The rear main seal on my 1952 FCUB is leaking whenever I am mowing and it gets really warm. It is not enough of a leak to be a problem. Actually to me, it only looks to leak if I shut it down. While the motor is running, it does not seem to leak. Does anyone make an oil additive that actually works to stop these leaks?

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Shane Nelson
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Re: Leaking Rear Main Seal

Postby Shane Nelson » Mon Jul 23, 2018 4:43 pm

Your crankshaft/flywheel is slinging the oil all around is why it doesn’t look like it’s leaking while running. Tst can fix it but you’ll have to split it and send it to him. There is nothing else that will fix it.
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Glen
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Re: Leaking Rear Main Seal

Postby Glen » Mon Jul 23, 2018 5:42 pm

Hi,
tst is a member on here, if you didn't know. The modern oil seals don't fit right in some of the older Cub crankshaft rear seal retainers. He machines the hole in the retainer, and puts in a new seal that fits tight in the hole.
Below is a pic of a rear seal retainer, from TM Tractor. :)
Attachments
Cub rear seal retainer.jpg
Last edited by Glen on Mon Jul 23, 2018 8:54 pm, edited 1 time in total.

Eugene
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Re: Leaking Rear Main Seal

Postby Eugene » Mon Jul 23, 2018 8:11 pm

My opinion, as long as the oil leak is not excessive and does not drive you crazy, wait until you need to work on the clutch.
I have an excuse. CRS.

Gary Dotson
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Re: Leaking Rear Main Seal

Postby Gary Dotson » Tue Jul 24, 2018 6:17 am

I'm going to find out if the Lucas engine oil stop leak works, or not. My 57 has a leaking front crank seal and I don't really want to tear into it. I'm going to give it a shot, I've got nothing to lose.

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IHCFan1950
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Re: Leaking Rear Main Seal

Postby IHCFan1950 » Tue Jul 24, 2018 9:58 am

Gary Dotson wrote:I'm going to find out if the Lucas engine oil stop leak works, or not. My 57 has a leaking front crank seal and I don't really want to tear into it. I'm going to give it a shot, I've got nothing to lose.


Gary,

I have heard good reviews about the stuff. Personally, I have never had any experience with the stuff, let alone used it on a tractor. I do know however, that their shift ease magic formula has really worked well to keep my trucks tranny shift much smoother.
If a sharp rap with your hammer doesn't work, you know it's an electrical problem! :lol:

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tnestell
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Re: Leaking Rear Main Seal

Postby tnestell » Tue Jul 24, 2018 12:49 pm

Gary Dotson wrote:I'm going to find out if the Lucas engine oil stop leak works, or not. My 57 has a leaking front crank seal and I don't really want to tear into it. I'm going to give it a shot, I've got nothing to lose.

Worked on my old Honda motorcycle.

Rob in NH
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Re: Leaking Rear Main Seal

Postby Rob in NH » Tue Jul 24, 2018 2:55 pm

just use a whole tube of silicone in your caulking gun pound it right in around seal, fix it right up.
Image

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Bill Hudson
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Re: Leaking Rear Main Seal

Postby Bill Hudson » Tue Jul 24, 2018 3:51 pm

Gary Dotson wrote:I'm going to find out if the Lucas engine oil stop leak works, or not. My 57 has a leaking front crank seal and I don't really want to tear into it. I'm going to give it a shot, I've got nothing to lose.


I await your results. I've got the same problem.

Bill
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xraycajun
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Re: Leaking Rear Main Seal

Postby xraycajun » Thu Jul 26, 2018 12:10 am

Does anyone know what year models/serial numbers are affected by the new seals that don't fit properly? I may have to be replacing mine as well.

Jim Becker
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Re: Leaking Rear Main Seal

Postby Jim Becker » Thu Jul 26, 2018 1:10 am

xraycajun wrote:Does anyone know what year models/serial numbers are affected by the new seals that don't fit properly? I may have to be replacing mine as well.

This thread may answer some of your questions.
viewtopic.php?f=1&t=63197


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