Suggest you get a NDT check on the shaft end to ensure there are no cracks or indications.
You want to do this because the MTU's "are way too expensive to run"? Even if you can find something that may work (doubtful) what do you think...
Lots of debates on the benefits of this vs cost and there will never be consensus. Curious, if the air filter is bagged and exhaust is plugged,...
Curious why you leave block heaters on during lay-up regardless of in water or not?
