chrysler 9.9 impeller replacement??? (Sailer 250)
 

I have a Chrysler 9.9, early 1980s, model Sailer 250. It's long shaft
with electric start. When I got it, I was told it could probably use
a new impeller(water pump).
1) - How do I get the impeller out? Do I have to remove the lower
unit? I've never done this before...and no one local wants to work on
Chryslers.
2) - Any ideas of where to obtain a replacement impeller?

Thanks for the help.

-Mark