Taking a wider view you don't say what sort of boat you have or what you use it for or why you want to replace your current engine
The problem with second hand diesels is that they are, well, second hand. That is, there is going to be a reason that they are being sold.
Rebuilding an old diesel
can be an expensive and risky process. Before buying
an unknown engine
do check the cost. You could find it works out to be more than a new engine.
And since you are doing a repower
the cost of installing the engine and upgrading associated systems is going to be expensive. I have seen estimates that suggest that installation
costs about the same as the price
of a new engine. While I did my own work my experience bears this out.
The only marine
engines that come up repeatedly as being rebuildable are the Perkins
4108 and the 6 Cylinder Ford Lehman
, and these are getting old, though parts
are reportedly still available.
The engine/gearbox is the one component in a cruising boat that gives the most grief, and rebuilding is not practicable in many cases. My opinion is that the gearbox
needs to be well oversize and anecdotal evidence seems to bear this out.
Rater than go second hand unit if you can "fix" your present engine to last a few more years while you build up your kitty for a new one that would be better. This is a good time to start upgrading fuel
and control systems so that the next engine is coming to a good home, and this may reduce or even solve some of the problems you may be having.
Marinised Kubota diesels have received good reports and Yanmar
continue to be popular with good reason. My experience has been that new pricing can be very competitive with rebuilding a second hand motor
particularly when longer term benefits are considered. I'd strongly suggest calling your local dealers and discussing your requirement with them.
After months of fiddling round I removed the old Ford in Boracay and installed a John Deere 4045/ZF63. I have found it to be an excellent engine/gearbox combination though it may be too big and heavy for your boat.
After saying all of the above I did see a Peugeot-Lehman for sale on this Forum
and it could be worth checking if it is still available.
I also found an article on repowering from a Peugeot-Lehman
that would be worth reading.