Have a 5HP Scott Atwater serial # 3775-5150 has forward neutral and reverse. Motor runs real well except for last Friday night. Overheated and quit running. I removed the water pump and checked - impellers look good. There are two small holes just above the propeller assembly on the lower unit that started seeping a dark foamy oily fluid. I thought that maybe the tube that runs water through pump to engine came off at bottom and was sucking a mixture of gas/oil/water through engine. Also when I took off water pump, it looks to have keyed impellers but all i found when I took it apart were two roller bearing looking things that had fallen into the housing. The shaft isn't exactly keyed - has larger slots, is that what runs the impellers?
