Transmission oil seals

[Johnny]

My transmission leaks oil. Okay, I know most all do, but mine leaks a lot, about a 12" circle after a long ride. Mostly from the front of the transmission, but also from the rear. My question is, can I change out the oil seals without opening up the transmission? Also, I see Moss sells replacement seals, are they good seals? I have a '60 BN7 with a side shift transmission. The manual doesn't show oil seals, but for top shifters they do? But in the Moss catalog they list oil seals for side-shifters.
Thanks for any input.

 

[Keoke]

Johnny, for some extreme case of oil leakage at the front of the Tranny we have been replacing the input shaft bearing with a double shielded type in addition to replacing the seal.Working on the gear box is generally simplified if its out of the car._FWIW---Keoke

 

[MotorHead67]

Wouln't a leaky engine rear main seal look like a bad leak in front of the tranny?

 

[Keoke]

/ubbthreads/images/graemlins/iagree.gif Yep it sure can MH67, but we must trust that the lister knows his leaks source.---Keoke /ubbthreads/images/graemlins/laugh.gif

 

[Johnny]

[ QUOTE ]
Wouln't a leaky engine rear main seal look like a bad leak in front of the tranny?

[/ QUOTE ]
The oil on the floor is clean, not black, that's how you can tell. Plus, I have to add oil to the tranny, not the engine.

 

[Johnny]

[ QUOTE ]
Johnny, for some extreme case of oil leakage at the front of the Tranny we have been replacing the input shaft bearing with a double shielded type in addition to replacing the seal.Working on the gear box is generally simplified if its out of the car._FWIW---Keoke

[/ QUOTE ]

Thanks for responding. I did plan on removing the transmission first. But, do you have to "open it up" to replace the bearing and the oil seal?

 

[Redleg6]

Hello Johnny:

I have a 60 BT-7 and I assume we have the same bellhousing. There is no oil seal in this bellhousing, nor is there an indenture for one. I took a peak at the bellhousing on a 63 top shifter and the bellhousing is different and does have an indenture for the oil seal. Therefore, buying the oil seal for top shifter will do you no good. When I put my trany together, I wondered whether it would leak as well. I have not put my car on the road yet and have yet to even fill the tranny with oil.

What weight oil are you using in the tranny? I know that when I used heavier oil in my 70 Harley it really reduced the amount of oil leakage but it had the newtonian effect of transforming my right leg to popeye proportions from trying to kick the beast over in the cold. Also, I can see no way to get a seal around the input shaft without pulling the box. Pulling the box isn't that bad anyway... Lastly, KEOKE's idea of a customized seal of some sort sounds promising but I am curious how that works exactly. Good luck and if you do find a solution please post it.

Good Luck-

Kmeyer

 

[Keoke]

Yes Johnny, the box must be opened up to remove the input shaft and its bearing ,not rocket science at all.---Keoke

 

[Johnny]

Thanks for responding Kmeyer. I may have mislead some. I don't think there ever was a seal around the bell housing of any transmission. In fact, there's a hole in the bottom (thank goodness) to let the oil leaking out of the input shaft. Otherwise oil would impregnate the clutch, not good. No, I 'm referring to the oil seal around the input shaft.