Find out what make the engine/ gen set it is, get a manuel and tear it down...ie... remove the generator off the back end, exhaust/ intake manifolds
alternator...and any other accessories. get it down to the block and
head. Using blocks and boards, slide it to the
deck under the
hatch in the
galley floor. make a lifting gantry out of 4x4's and
lift it to the
galley floor and set it on a small piece of
plywood. slide it to the steps at the companion way and make another lifting frame at the top of that. set it on a dolly in the main saloon/pilot house and
wheel it to the aft
deck. if you have a davit for a
tender use that to
lift it to the
dock. you'll need one to two other people to assist. Take it slow. you'll be lifting at a slight angle from the galley to the
saloon and off the back deck, you'll need someone to hold it away from the steps as it is lifted. once it is broken down to just the
engine it will be small enough to fit through all the
passage ways, not to mention much lighter.
It doesn't matter what make and model it is, for tear down and
removal, unless you are going to
rebuild it. in that case you'll need to have manuels for the specific make and model. but for
removal and
installation, you'll need to break it down to it's basic components, to be able to fit through the passages. whether you are replacing with a different genset or not. I've replace a koler in one hatt and installed a
westerbeke in another hatt. They all fit once torn down, without cutting or damageing any of the boat. Actually did the kolar one by myself....I was a might younger then. that was alot of climbing up and down to relieve stay lines. You don't have to be a top machanic, but being mechanically inclined, would be a must. other wise get someone who is. or if you hire it out GET
REFERENCES, from trusted sources.
Good luck
Lance