Originally Posted by n5ama
I agree totally. I can visit the boat
. The Kubota issue was just one of the things I wanted to research
. I am considering purchase
but have to get several issues answered before going forward.
I plan to have the standing rigging
replaced and possibly the chain plates etc if needed.
Are there retro fit heat exchangers available? If so, who might have them? I'm assuming the same thru hulls that are currently being used on the Kubota could be used for a heat exchanger
Originally Posted by n5ama
I really appreciate the help on the Kubota. It seems the engine is not the issue but making sure the cooling is properly done with a heat ex-changer that keeps glycol on the engine side and seawater on the other with enough capacity to insure cooling. It seems that 18gpm with a 2.5-3" hose and +- 1' length should do the job. I'll either have to find a pto on the engine or a battery
to move the seawater through the heat ex-changer.
If needed, aftermarket heat exchangers are available in a plethora of configurations.
Almost certainly the same thru-hulls for raw water
and engine exhaust can be used for any updating or changing of the existing cooling system, but perhaps it might be prudent to identify what you have before planning for changes.
There is an about equal chance that the existing system is adequate, or could be made adequate with minor changes.
The 'tractor engine' term is being thrown around alot, and may be as source of confusion as well as being inaccurate.
A more informative appellation might be an 'agricultural implement or small generator
engine', as, for a 28' boat, a 2 or 3 cylinder, 12-20 hp diesel
is what is likely to have been installed, and while big heavy tractor engines that were, and in some instances still are, a major supporting part of the drive train, design and engineering advances, as well as economic 'necessities', have made it more likely, especially in smaller hp applications, for a modular construction approach. It is, after all, how Kubota and others can use the same basic engine in a lawn mower, a generator, a sailboat, a mini-excavator, a reefer, or yes, a tractor.
Unless something is rather out-of-the-ordinary, for a small sailboat diesel
, the sea water supply would typically be through a 1/2 - 3/4" hose, with a maximum flow rate of about 2-3 gpm, exhausting through a 1.5 - 2" exhaust hose and water-lift muffler
. On small Kubotas, the PTO is usually on the front of the engine, gear
driven and in ag applications drives a hydraulic pump. Life as a seawater pump drive is easy street...
And Kubota engines are generally top-of-the-line in all respects, though, as with most manufacturers, ancillary systems can be a little less reliable... for those manufacturers in second-tier markets, like marinizers or lawnmower makers, this can be doubly problematic.
I've got a 2 cylinder from the mid 60's and a 4 cylinder turbo from the mid 00's, and after (mostly) working the ancillary's (of course) bugs out (electrical and hydraulic), they're both trouble free; very good machines indeed.