Leaking lower shift shaft Alpha One Gen 2

nennedk

Seaman
Joined
Jun 11, 2016
Messages
73
During the summer i had to refill a little gear oil at my alpha one drive twice, so now it was time to check for leaks. As you can see at the picture i have a leak at the lower shift shaft. The manual say to split upper and lower unit and remove the 2 screws holding the shift shaft assembly and pull straight up. Is it that easy?
When i put pressure on the drive (10psi) the lower shift shaft was pushing up by it self, about 2 cm before i saw it and pushed it back in. Isn't that wrong?
The service manual No14 page 3B-47 also tells to remove the shift crank. Should I? I'm afraid of not being able to install it again, or will it come out together with the shift shaft?
It doesn't seems to be necessary to you specials tools for this operation. Can you confirm?
And lastly, which parts should I replace? I'll appreciate your time to answer to my questions. Thanks.

Ps. there wasn't any water in oil or bellows which confuses me....
 

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Rick Stephens

Admiral
Joined
Aug 13, 2013
Messages
6,118
It is normal when you pressurize the case that the shaft pushes up - well, at least it did that on every one I ever tested. When I resealed my drive I just replaced the entire bushing housing, seals, o-rings and all. It is not very expensive and the housing comes with the seals pre-installed. Yes, you have to pull the lower shaft out. No, you do not need special tools, and no, it is not hard to get it back in afterwards and check that it functions correctly. Slide it in, rotate clockwise, should stop turning when facing fore and aft and prop shaft will be engaged when rotated CCW.

Go to it. Easy peasy. :^)

Rick
 

nennedk

Seaman
Joined
Jun 11, 2016
Messages
73
You were right Rick. Easy peasy 😀 i found out why i couldd move the shaft up. A e-ring was not in its place. It sat at the middle of the shaft a little bended instead of where it should be at the top. Glad it didn?t went all the way down. Thanks for your help
 
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