Drain the engine compartment and let it ‘air-dry by leaving the compartment open. You might have to replace the air filter, clean the plugs, plug wires, and any other wiring. It should be okay.

Could you estimate how deep the water as……I’m assuming it got up above the level of the oil pan, however if you check your dip stick and the oil is honey colored, and not above it’s normal full level, then you probably are not to bad. The starter motor should be removed, and serviced. (cleaned and lubed. ) It most likely got soaked. Clean all the wires and terminals that attach to it. WD-40 is designed to displace water. So get a couple cans and spray everything, as soon as possible. Things like the bilge blower, battery switch, fuel tank sender etc. Keep in mind that some water flowed up toward the bow so check that area as well. The major concern is that water seeped in the front or rear main seal. If so you need to pump the engine oil out. ( a difficult task) I’d put a mix of alcohol and diesel fuel in to the pan and then pump that out, before putting new oil in. It might be possible, (but unlikely) that you can pull the oil drain at the bottom of the pan…Bottom line is you need to get all of the water out. Once you put new oil in. don’t try to start the engine, but do crank it over several times…..say 30 sec. each time. I think you are fuel injected and solid state ign. so just spray all of that with WD-40. Once you are satisfied that any water that actually got inside the motor, has been removed. Try starting the engine. At any sign of abnormal sounds…..take this to a good service shop. They will in all probability need to remove the engine from the boat disassemble it. I would give you good odds that will not need to be done. but it would depend. Treat this as a sunk engine, and don’t let it sit, only bad things happen if you do that. The sooner you work on it the better……Also check the fuel tank…….it should be sealed against water like this, but it can fill with water…… during the next few weeks look to the electrical system for minor problems, trace them and repair. I don’t think water would have been deep enough to get to the alternator but it might have…….Only you know how deep it got. good luck!

EDIT all of the above applies. Spark-plugs and ign should be high enough that they were not under water. So check to oil dip stick carefully. if water in in the pan, oil will float on top, thus showing overfull….. The starter was under water, so it will need to come out for repair. Once that’s back in, if the engine will not crank, it will need a mechanic……Its crank shaft bearings you have to worry about, but as I said before I’ve seen many engines run fine after minor repairs. Again good
luck!