I am a new owner of a 1995 Catalina 270. It has an 18hp Westerbeke engine. Over the weekend, the "tone" of the engine suddenly changed to being less muffled and the engine temp started to slowly rise. I was close enough to my marina that the engine only ran a short time in this condition and the temp never rose to a warning level. Once docked, I checked the raw water strainer and found that it had sucked in a sizable chunk of milfoil weed. I cleaned out the strainer, but the engine is still running a bit hot. I am assuming that the impeller may have become a victim during the process. Does this sound logical? The boat didn't come with any spares so I've tracked down a replacement impeller kit and hope it is an easy repair.