looking at this boat owner didn't winterize and now both exhaust manifolds are cracked externally don't know if they are internally also pushed freeze plug out of engine below head an right side if you are facing the front of the engine there is water in the oil also what would be best way to start diagnosing to find out if engine is ok or not motor runs no unusual noises and we didn't run more than a minute or so just to be sure it still ran water obviously came out of hole where freeze plug was missing but had just started when we shut it off thanks for any help