Changing 170 outdrive impeller

[scook]

It's been too long. Can you guys give me the short form tutorial on changing the impeller in my 1985 Mercruiser 170 outdrive. I'll probably recognize most of what I need to do when I get in there but I recall that the throttle lever needed to be in a particular position (I think it was forward) and I need to drain the oil before taking it apart??

Comments appreciated.

Thanks