1977 Johnson 70 hp is overheating. I replaced the impeller on the water pump and now it overheats. I took of the thermostat off and I am getting no water up top when the dog ears are on. Any ideas? What did I screw up and or miss?
Try putting it together again. You've got something missing or installed incorrectly. Either a missing or split seal, oring, gasket or key. Or an impeller that has separated from it's center metal bushing. Make sure you have the complete parts/assembly diagram for your year and model outboard.
