Slow transmission oil leak - Crack it open?

[OsoMoore]

I dropped my engine a few months ago and nearly have it rebuilt. When it was out, I initially put the transmission on its back end in the garage, and found a small puddle there when I looked a week later.

I've since moved it to the normal horizontal position and it leaks more slowly. Still, over the past two months it has slowly been leaking Kendall onto a piece of cardboard underneath it. It is hard to estimate exactly how fast, maybe a tablespoon a week.

I'm planning to wash it down carefully this weekend and get a better scope of the rate of the leak. But I'm wondering if I need to do more than refill it. I rebuilt the transmission in 2017, and haven't opened it in the 8 years since.

[tobluforu]

Is it leaking out of the main shaft seal? Other more inclined mechanics will chime in, but if it can be replaced without opening the tranny, do it.

[wrxnofx]

My G50 has a vent on top. If you've flipped it over perhaps it's leaking out of a vent on what I assume is a 915?

[OsoMoore]

Power washed it extra-clean on Sunday, placed on fresh cardboard for 3 days. Looks like the leak is coming from that seal on the nose. Pretty slowly at least.

[Otter74]

That's the shift shaft seal. Easy to replace with the transmission out.

[OsoMoore]

Originally Posted by Otter74

That's the shift shaft seal. Easy to replace with the transmission out.

Thank goodness, I really didn't want to have to open that up again.

[kevingross]

https://www.youtube.com/watch?v=b-6bUQT8iaE

It's a different transmission, but the tool they recommend will help and the overall process is the same.

[OsoMoore]

That explains it so well! Now I just need to get a parts list from the rebuild to get this seal in there too.