The answer to your original question (Are We in Trouble?) may be yes. However, it really depends on the details of the transaction and ownership transfer.
If you are in a situation of being stuck with owning a broken boat (engine), you are really relying on the dealer acting in good faith. If I were me in this situation, I'd see if the dealer is going to fix the boat (ie replace the engine) at their expense and amend any contractual agreements to give you right of refusal after repairs are done. Not sure they will go for that, but it seems like you have a fair amount of risk at this point.