Catamaron Harmony in the rain

Last night was 34 24.243N 77 35.432W in a little side creek After a day of fairly moderate rain with a few clearings we anchored for the night. Made about 60 miles from Beaufort to just south of Surf City, NC. In the middle of the night it started blowing with heavy rain. Got up several times and we seemed all right. Checked again about 6:45 and we had dragged and were aground. Luckily pulling up on the anchor chain cleared us and we decided to leave early. Going along fine on one engine then I put the port one on as we came up to pass another sailboat. Not pumping water and started to steam so I throttled down and heard a clunk. Immediately shut it down and checked fluids. Needed some water but otherwise OK. Since it wasn't pumping water checked what I could, cleaned the strainer and all was ok. Tried it again and it was fine. I think the steam was from a lack of antifreeze coolant for the heat exchanger and the clunk was from going into neutral too fast with too many RPM at the time. We have been using the port engine only when we need maneuvering Tonight we are heading for Southport. DR wants to revisit the scene where she was taken to fix her boat from her trip North on the ICW.