[eherlihy]

That is a Sherwood raw water pump. Oberdorfer makes the other pump for that engine. You could rebuild it, (read about that here: http://www.sailnet.com/forums/diesel/60992-rebuilding-oberdorfer-pump.html) but do yourself a favor and don't...

Call Depco Pump in Tampa (or maybe St Pete) and just buy a new one. It should cost ~$200 The guys at Depco really are experts. Make sure that you get a catalog from them too.

[EDIT] Depco is in CLEARWATER, FL

 

[eherlihy]

.. If you are not going to follow my advice in the above post, Maine Sail posted a how to on rebuilding his Westerbeake pump here; Rebuilding A Raw Water Pump Photo Gallery by Compass Marine at pbase.com