Raw Water pump leak

[Stu Jackson]

Just to be clear, the issue is leaking past the outer lip seal so he needs to pull and inspect the shaft, not just pull the impeller from the shaft.

When one tries to reinsert the shaft/impeller as a unit there's two locations (180 degrees apart) that the shaft fits back onto the camshaft.  If it's not lined up correctly it's difficult to rotate the impeller when inside the water chamber to get the shaft lined up with the camshaft.
 
That's why it's best to mark the position of the impeller when removing it.

Ken's right.  This issue comes up so often that I took pictures of the shaft and what's inside behind the gear case cover.  Those photos are in this link:

Oberdorfer Pump Rebuild 101 - http://c34.org/bbs/index.php/topic,6766.0.html [Link added to main page of C34 Tech wiki]