As a new owner I am learning the hard way. I left the seacock closed and ran the motor so now there is no water coming out of the exhaust. After I realized the issue, it was too late and with the seacock open still no water. I probably cooked the impeller. I have a 1977 version of the 4-107 and after looking at the westerbeke parts lists I am confused as to which impeller number I need to get. Is it the 11906 kit? Looked at old threads here but was not able to confirm that number (Saw a sherwood reference for a pump replacement)
Thanks
I use Globe Impellers. They claim to be able to run even dry for a little while. I have not tested that claim but use them anyway. Cost is slightly more but hey, it's a boat.
www.gcsmarine
Model number 620
Globe part number 1-12-1460
Ron
SV Matchmaker