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#1
11-27-2010, 07:14 PM
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Cub-Ota - Twin Cyl Kubota Diesel in a Cub 108
Here is a link to some of the pics to the build of the great Cub-Ota. The installation of a Kubota Z-600 twin cylinder watercooled diesel that makes around 14 hp from what I have read. Make sure you follow them all the way to the bottom of the page and click on the "Older Posts" to see the finished rig.
http://tntsgarage.blogspot.com/ She is all done and has been out pushing snow for 2 days now. I ended up turning the clutch around so that the driver is connected to the tranny and the shaft to the flywheel on the engine. There was some machining needed to do this. I used the stock clutch hanger after trimming it down some. I have some pics of the adapters that I made but have not loaded them yet. I think I am going to redesign the driveline to use a kubota clutch and pressure plate or I will have to make my own heavy duty clutch using aftermarket pieces. This has quickly become my weak link. I also stilll need to figure out what I am going to use for a fuel tank. At the moment the stock tank is mounted on the fron of the tractor since it clears the plow and seems to work alright but it is definately ugly. I will be making a tank or finding another tank from something that I can fit somewhere that it will look better. For now this is all I have. There are also pictures of my Cummins powered wrangler too. . . . . If you are interested. The Jeep was sold and now resides in Arlington Texas somewhere last I heard. Any questions just ask. Ottis 
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#2
11-27-2010, 07:25 PM
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The stock clutch can easily handle 14 hp, particularly with a stronger spring. If the clutch doesn't hold, you need to true up the pressure plates in a lathe, replace the friction disc, throwout bearing, main spring, etc.
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#3
11-27-2010, 07:51 PM
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Matt, I am aware that the stock clutch can handle the 14hp. But I dont really like the way that the driveline is set-up at the moment and if I am going to spend the time redesigning it I would use some different pieces. I have limited space to work with so I would explore my options as far as using a Kubota clutch set-up or if I use the stocker I would add a 6 pin driver and a different disc. If anything I would imagine the drive pins would fold before anything else would give. That is all I was intending to say.
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#5
12-06-2010, 04:27 PM
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very interesting build, thanks for the post!
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#6
12-06-2010, 11:22 PM
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thats awesome. what are those 14 horse kubotas used in?
__________________
Nick.  Cub cadets 100, 125, 86, 108, 109, 128, 129, 129, 149, 149, 169, 1450, 1650 and a handfull of parts tractors. #40 box blade, ih back blade, rear ih rock rake, #2 cart, windbreaker soft cabs, windbreaker hard cab, cozy cab, kwikway loader , wards corn planter, brinly plows, culitvator, rear blade, disc and the usual decks, snowblowers and 2 tillers
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#7
12-07-2010, 08:45 AM
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ok, u can use the Cubota name. i am going to put Kub Kadet on the side of mine. i used a 22 hp D950 3 cyl in my cubby.
i see used a honda rad also. mine came out of a civic though. fit perfect in the front of the tractor. had same issue with fuel tank, ended up using a 2 gallon mooneyes tank mounted infront of the grill. u have a plow so that wont work but just an idea. maybe on the back of it behind the seat.    
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#8
12-07-2010, 02:05 PM
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The 14 horse Kubota was used in the early 5 or 6000 series tractors and is used today for reefer trailers and generators.
Diesel Crawler, looks good. I thought about the 3 cyl but I wanted to do as little of cutting as possible. I may have to trim a bit of the hood when I mount my turbo but for now I have other things to worry about. I twisted the driveshaft apart when I was plowing on saturday so I am now back to the drawing board and probably going to switch to a hydro rear end.
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#9
12-07-2010, 03:03 PM
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Very cool Tony. I will let you work all the buggs out of it and then let you do one for me Ha Ha. Those little diesels have way more torque than the stock gas engines. Probably why you twisted the drive shaft off. The stock drive shafts get very week where the holes are for the roll pins. You do need to get rid of those Deere weights though.
__________________
Soo many Cubs Soo little time... Current collection: Orig. (2) 70's, 100, 71, 72, 73, 86, 108, 128, 169, 800, 1650, 1811, (those are the keepers for now) Kwickway loader, Haban Mower, #2 yard cart, IH box blade, IH york rake, IH back blade, Donnell Fork Lift attachment, Planet JR. two row planter, many brinley attachments, and of course tillers, decks, blowers and push blades. Would like to find a Viking seeder, Gannon eartcavator, other unusual attachments, and 9 speed Original.
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#10
12-07-2010, 06:04 PM
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They have more torque, but not THAT much more torque. In my Kubota manual at home, there's a torque curve for the D600B (15 hp) in my 782D. I think the max torque is only in the low 30 ft-lb range.
I'm not surprised you twisted off a 35-year-old low-carbon steel driveshaft. There's no need to reinvent the wheel here. Get some 4140 pre-hard...that should be good for about 41 ft. lbs. of torque (more than the engine you have is putting out) at a factor of safety of 2. I have worked my 782D quite hard and never twisted off a driveshaft.
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