This is not a difficult process. Slow, labour intensive, sure. I just went through this process with an engine that weighs just short of half a metric ton. Did the whole job on my own just using patience.
General procedure I followed was:
1. Made a jig to record
the position of the engine. Put this in a safe spot.
2. Put a pair of timber planks under the engine to take the weight. Removed the engine mounts and put two steel rhs beams along side the engine to prevent it leaning over.
3. Slid the engine forward into the cabin
on the timber using a four to one block and tackle plus a small trailer winch
4. Remade the stringers (in my case they were changed to suit soft engine mounts) plus dealt with some "issues" in the rear keel
5. Reversed the procedure.
The point of all this was that the whole process was manageable by one person despite the weight of the engine and gearbox
and moving it out of the way completely made the remanufacturing of the stringers a breeze.
If you can safely and easily slide the engine out of the way then you have time and a safe working environment
to deal with the stringers properly and you are not risking life, limb and boat by dangling an engine off anything that might break.
The hardest part for me was getting in and out of the cabin with the engine in the way as there was no room for the steps. Standing on the engine is an invitation to disaster.
$13k would be plenty of incentive for me to tackle this project. And if you've managed to rejuvenate the boat yourself to this point then this will be hard work but very rewarding
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