Is there a telltale on this motor? I don't seem to see one under the cowling and there definitely isn't a stream of water shooting out like I see on modern motors. How do you check if the water pump is doing its jobby job?
running on a flusher is not a test to see if the water pump is working as it in effect bypassing the water pump. If it is not pumping water like the owners manual says it will then put a new impeller in it.