I have a Cummins/Onan 5.0MDKBH. It is a nice generator
, and I like it a lot, but it has one flaw. The water
pump is at the top of the engine
, which means that on our boat it is above the water line. On startup, it takes about 5 seconds for the pump to draw seawater up to it, which means that the rubber impeller is running dry for that time. As a result, we we are going thru 2 or 3 impellers a year with only about 75 hours of running. It is a big job replacing the impeller, since the whole pump must be removed. The engine
is a Kubota Z402. The pump is a Sherwood 8000.
I am aware of the Globe run-dry impellers, but unfortunately they don't make a model for that engine.
Has anyone got any ideas how to resolve this problem. What are your thoughts on replacing the belt driven pump with an electric
one placed below the waterline.