I have a 79' ITA RX7, I drained the oil to find the water from the radiator come out with it. I am new to rotaries, is there a possible fix for this or do I need a new engine? I just put straight water in it a couple of weeks ago and it did not have this problem then, but the temp. has gone below zero since then, I think I froze and cracked somthing? I have not run the engine since it has had this problem. I would really apreciate any advice.