I was given a Johnson 9.5 outboard SN: M 9R 72M. It starts on the first pull and ran great in the tank except for one problem. No water coming out the tell tale, which is about the size of my thumb. I pulled the lower unit and found the water pump housing had only 2 screws holding it on. I pulled the housing and saw the impeller looked good so I dug into my spare parts and found 2 more screws and put it all back together. Low and behold she now pumps water but only at mid or high rpm and what comes out is scalding hot. Is this normal or is the engine running hot?