Rear Main Seal Conditioner

txasylum · Nov 21, 2022

Has anyone tried the Bar's Leaks Rear Main Seal, or any other product that is formulated to stop the seal from leaking? Trying to decide on buying a bottle and try to stop the rear main from leaking or if I should just tear into it and replace it.

John Deere D · Nov 21, 2022

Make and Model of Tractor please.
Bob..

txasylum · Nov 21, 2022

1940 JD L.

J Hamilton · Nov 21, 2022

My opinion is you can fix the oil leak now or fix it later. Stop leaks are a tractor jockeys best friend. If it is a small leak or seep it will probably stop or slow it for now. It should be fixed correctly

txasylum · Nov 21, 2022

I found a front main seal on here for the L, but I did not find one for the rear. Been searching for a rear seal.

wore out · Nov 21, 2022

(quoted from post at 10:45:40 11/21/22) 1940 JD L.

Looks like your 1940 tractor would have a Hercules engine, I believe the front seal sold here is for the later John Deere engine.

Hercules was used through Serial # 634840, in 1941.

It's unclear to me, looking at the parts catalog if they used a rear seal on the Hercules engine.

https://partscatalog.deere.com/jdrc...JT04sMjU1MDojQ0FUQUxPRyw3MDQ3MDpFUVVJUE1FTlRd

Link to official John Deere parts catalog.

Tx Jim · Nov 21, 2022

Model L rear engine crankshaft seal is AT195T which should be available from a JD dealer or possibly cross-referenced

rrlund · Nov 21, 2022

Lucas engine oil additive. I had one leaking practically in a stream. Two days later it was sealed right up.

txasylum · Nov 21, 2022

You are right. It is hard to tell if there is a seal there or not. I haven't found any yet in the parts listing. Oil is streaming out of the hole in the bottom of the bell housing, seems like there would be a seal there.

(quoted from post at 12:06:54 11/21/22)

(quoted from post at 10:45:40 11/21/22) 1940 JD L.

Click to expand...

Looks like your 1940 tractor would have a Hercules engine, I believe the front seal sold here is for the later John Deere engine.

Hercules was used through Serial # 634840, in 1941.

It's unclear to me, looking at the parts catalog if they used a rear seal on the Hercules engine.

https://partscatalog.deere.com/jdrc...JT04sMjU1MDojQ0FUQUxPRyw3MDQ3MDpFUVVJUE1FTlRd

Link to official John Deere parts catalog.

txasylum · Nov 21, 2022

Mine is a stream from bottom hole in the bell housing. I figured nothing would fix that. Are you talking about the Lucas Oil 10278: engine oil stop leak?

rrlund · Nov 21, 2022

I don't know what the number is on the bottle, but it's probably the stuff. That other stuff is what I used one time that melted
the seal and left it stuck to a shaft I think.

gbs · Nov 21, 2022

be careful using seal conditioners they work ok on a hardened seal but not on a worn out one, i put some in the front axle of a pickup to stop a slow leak on the pinion seal, worked like a charm for about a
year, them had to replace all 3 seals in the gear case as it turned the rubber to a soft gum.

txasylum · Nov 22, 2022

Yeah, I'm very cautious about using it. I'd rather change it, but I'm having a hard time finding a rear main seal for the motor.

(quoted from post at 17:32:09 11/21/22) be careful using seal conditioners they work ok on a hardened seal but not on a worn out one, i put some in the front axle of a pickup to stop a slow leak on the pinion seal, worked like a charm for about a
year, them had to replace all 3 seals in the gear case as it turned the rubber to a soft gum.

Rear Main Seal Conditioner

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John Deere D

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