I recently repowered my swanson 42, replacing the original Lehman
80HP with a WM Diesel marinized Kubota. That same Kubota engine is marinized by Beta and Nanni. Very happy with the new engine, it is smaller, lighter, quieter and more fuel
efficient than the ford.
The performance curves of the Kubota are almost identical to the Ford, I retained the original gearbox
(rebuilt) and the original prop shaft and propeller
. The original fuel lines and exaust system were retained. New engine panel, of course. And Wm Diesel fabricated custom made feet to fit my engine bed
. The kubota sits much lower than the Ford, and I had a custom made high rise mixing elbow
I had a good marine
diesel fitter advising/helping on the crucial bits. He advised getting a new engine, despite a rebuild
of the Ford meaning more work for him. As he said, while a good engine in its day, the ford is a 50 year old design, and parts are becoming hard to get, especially in remote
places. Here in Australia
, it is impossible to get things like exhaust
manifold, high pressure fuel lines, etc. I would urge new over rebuild
The new engine probably cost twice the cost of rebuild. If your engine is 57HP, I understand they can be rebuilt a little more cheaply than the 80HP. Not sure about the parts situation for the 57HP.
The physical removal/replacement of the engine is worth some thought. The Ford is very heavy, despite the fact I stripped it to bareblock/sump to get it out. A crane is essential, I strongly recommend against using the boom. At some stage during removal
one or two people will be working alongside or under the engine.
I don't know the configuration of your boat, but I had to cut the cockpit
sole out for removal/replacement. I agonised over that for some time, but it was the only way. Again, with all that effort, I did not want to be putting an old engine back.