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
Methinks you are over thinking this. Once the pump is assembled over the drive shaft, it is impossible for the pin to get out, no matter what angle you are holding it. SOME pump plates are slightly convex , some are not You say your NOS was flat, so lets say that is normal. Now, if the pin is touching the plate, something is wrong. Possibly wrong drive shaft. Or possibly the drive shaft support in the gearcase is missing. Either way, you are wasting time and money till it is corrected.
If the original water tube grommet is in there and not rotted away, that part is ok.
No, the water pump housing does not seal to the shaft, except by the fit between the impeller and plate and the fit between the impeller and pump housing, at the drive shaft area. That is why the plate cannot be bent downward
No gasket was needed, nor provided
Finally, I gotta ask–where are you running this thing? It won’t work in a 5 gallon bucket.
Get back with us if it still doesn’t work after fixing the drive shaft pin position issue.