1st boat and new to it all. 1976 Johnson 55hp 2 cyl. How can I tell if the water pump is pumping? At partial throttle hot water pours (not shooting) out of the two verticle slots on the upper back of the verticle drive shaft housing. At full throttle no water comes out there. Water (hot) does shoot out of a hole just above the cavitation plate. It is a constant stream shooting foward hitting the back of the boat at about 1/2 inch above water level. The guy I bought it from said the impeller is new, but how can I be sure?
I've got about 20 hours on it now. 4 hours continuos in Florida heat and it didn't overheat yet so it must be cooling.