I have a 1972 8hp. I am not getting water into the block. I dropped the lower unit and submerged it in waster with a drill on the shaft. It was pumping. I shot a hose up the water tube and water came out of the exhaust port. I put it back together and its still getting to hot. No water is flowing out of the exhaust port. Any ideas? I don't see a thermostat, does it have one. The impeller looks brand new. Thanks for your help.

