2005 F50 Lower Unit Oil Seal Leak

[hogaboomer]

I bought a hand pump tester, wouldn't even pump up to 5 pounds, soapy water shows leaking around shift shaft. Not much of a mechanic, would appreciate some guidance before I break anything. What are the steps needed to fix this? How does that oil seal housing come out?

[fairdeal]

The black housing -
Yamaha calls it "plate" -
has been simply forced into place,
with the o-ring around it,
its a snug fit.

You can try clamping vice-grips to each of those "ears"
and then prying against them to pull it out.

Personally, for <$7.00
I would buy a new plate -
so not worrying about chewing up the old one, getting it out -

and of course you'll need the oil seal and the O-ring.

Going back together:
the new shaft seal gets pressed into the plate,
the O-ring worked into the groove of the plate,
and then the plate gets pressed (gently hammered?) back in to the LU
Mind the orientation...






Here's the page with the parts you need

https://www.boats.net/catalog/yamaha...casing-drive-1

[hogaboomer]

Thank you very much, fairdeal!

[hogaboomer]

Alright then, I got that plate out, and new parts ordered. Anything special I need to know about installing the new one? Specifically, this old one looks like it has some kind of leftover hardened liquid gasket or something on it...