Home › Forum › Ask A Member › 1953 Johnson Seahorse 25 hp RD-15 not pumping water › Reply To: 1953 Johnson Seahorse 25 hp RD-15 not pumping water
Still working on the water issue. Found the channels were worn unevenly so I filed the exhaust case and lower unit water channels so they are flat again. Found that when i was lifting lower unit into exhaust case at a steep angle the driveshaft was springing upward and possibly displacing the pin from the impeller groove and then pressing down on impeller and spinning on top of it once running. I will try to install it straight up instead of an angle to start…
I also saw that the driveshaft has scoring where it was rubbing on the oil retainer. There is also lots of play and a gap at the top of the housing around driveshaft. I wonder if a new oil retainer would be a good idea and if there was supposed to be an o ring at the driveshaft inlet of housing like the 54 models need. I currently have water housing number 302613 installed on the lower unit.
I did not try flipping the plate over so the convex side is up. It was flat when I unpacked it from NOS.
I don’t understand why it would be convex towards impeller. I guess I’ll look for an entire water pump repair kit, water tube grommet and a new oil retainer bushing to start off.
Any suggestions are greatly appreciated.