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Re: Re-Power Allied Princess
Usually, you simply unbolt everything (motor mounts, exhaust, fuel lines, prop shaft which may not want to simply let go). Hump the motor forward out of its den, hoist up and out using your boom or other hoist.
With a rare few makers, the cockpit floor unbolts for access.
But there are some boats where the engine was literally installed before the deck was attached to the hull. In THAT unlikely event, you could need to cut open the cockpit floor and rebuild it afterwards.
If you're not sure how to remove the engine--you'd probably want to hire out the entire job to a yard, and have them warranty the entire job. Making sure the replacement will fit, line up on the engine bed, and getting it aligned to the propshaft, are not rocket science but they aren't trivial tasks, either.