Its on a 96 75hp force made by mercury. Did a comp test and at cold 107,105,105 so do I need a new head gasket? Why else could there be rust a water leaking in somehow. I fogged the engine but would like to solve this puppy. Also my Generic manual is vague does not give Compression #s. I did notice that hardly any water was coming out the pee hole. And yes I have replaced the impeller.