[dgrimme]

First of all I am about to purchase a repair manual for my Merc, but in the meantime, does anyone have a drawing/schematic for a late model 25 HP Mercury water pump/lower unit they can email me dgrimme@peoplepc.com I need to get into this waterpump and fix fast! Leaking into lower unit oil! HELP!! Parts store was closed today (Monday), darn.

[hondon]

How do you know that water is entering through the water pump base?If you feel completely comfortable with that diagnosis then go to the local dealer and get a new base and o ring . Pry the old one out and install the new one.OOO, don't forget the gaskets.

[ehenry]

Wow, hard to believe that an engine that new is leaking at the waterpump base. I'd change the L/U fill and vent screw gaskets before I pulled the water pump base off. Also, check for fishing line wrapped around the shaft behind the prop. That can wear the shaft seal out quick. Just my 2 cents worth.

[dgrimme]

The water pump housing is not sealed well as I can see water leaking from one of the four housing screws when I pulled the lower unit off and filled the water pump with water to test for leaks. My guess is that I should try to install a new O-ring and go from there (seals, etc) if the problem persists. Any other ideas??