Join Date: Jul 2000
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A lot of what you do is a matter of religion. Letting the diesel run for a few minutes evens out the heat loads in the block while the cooling water is still running, so it cools down more evenly and the oil cools down as well, so it should coke less (cook & turn into tar) after you do shut down. Some folks would say to run an engine room ventilation fan until the engine REALLY cools down. Most folks just idle it a bit then shut it down, in the belief that diesels are robust animals.
Charging? Yeah, in theory the batteries should be fully charged before you go away, of that's convenient. As long as they are not heavily discharged and not left alone for many weeks, not critical.
Washdown? In the long run, if you can, probably worthwhile. Salt crystals are good abrasives, getting them out of the sails and lines is a good idea, but most folks don't have that luxury. And, you wouldn't want to store them outright WET, so most folks just put them away if they are dry.
More important is probably to make up a list of "secure for port" "secure for lunch", "secure for heavy weather" etc., that runs bow-to-stern with a list of what you need to do to secure the boat. Ideally you memorize all this stuff and never forget (sure!) so making up a list and referring to it at the start of the season isn't a bad idea. All the water intakes/drains should be closed, all the hatches need to be secured (on the "vent" setting sometimes, totally secured other times), all the switches turned off and then the main power switch off, with the bilge pump/alarm left on as you choose, etc.
If you plan to be off the boat for any length of time in humid weather, it helps to prop up all the cushions so air can circulate under them, to prevent mildew.
And both getting on and off the boat, first and last thing might be to check the bilge--just in case.