Bought a D662 Kubota engine today

[J-Mech]

Originally Posted by jubilee

A friend who repairs lots of Kubota engines in large commercial mowers told me I should pull the head on my D660 and make sure it was not cracked before I went too far with the 782D project. He sees a lot of them that have been cracked due to overheating. Mine came out of a Jacobsen golf course mower. Sure enough, it has multiple small cracks and cannot be used. I don't want to spend the money for a new one, so the 782 will be getting a different engine. I still have the good K321 that I removed from the 1450 when I installed a k341, so it will be now go into the 782. That will make life much simpler and cheaper too. I now have several new "spares" for the 1782 too.

You just keepin the diesel motor?
It really isn't very easy to put the 14HP into the 782..... Granted, easier than a diesel conversion.... but not a "direct" switch.

[Cubcrazy]

Originally Posted by jubilee

A friend who repairs lots of Kubota engines in large commercial mowers told me I should pull the head on my D660 and make sure it was not cracked before I went too far with the 782D project. He sees a lot of them that have been cracked due to overheating. Mine came out of a Jacobsen golf course mower. Sure enough, it has multiple small cracks and cannot be used. I don't want to spend the money for a new one, so the 782 will be getting a different engine. I still have the good K321 that I removed from the 1450 when I installed a k341, so it will be now go into the 782. That will make life much simpler and cheaper too. I now have several new "spares" for the 1782 too.

Sorry to hear about the cracks.

[ACecil]

Originally Posted by Cubcrazy

Sorry to hear about the cracks.

I agree, that's a bummer.

[Sam Mac]

Jim

Is it worth rebuilding?

[jubilee]

J-Mech and Sam-
We did get the Kubota engine to start and run briefly when we first got it out of the old trashed out golf course mower frame. Since it was not plumbed to the radiator, we did not let it run long, but at least we knew it would run. There were no unusual noises other than unmuffled exhaust. From what we have seen, prices for heads can run $700 to $1300 and I am not willing to spend that kind of money on this. Right now I plan to take the engine to my machinist friend's shop. Hopefully, someday one of us can find a head and make use of it.
As for the K321 engine in the 782, what kind of problems do you forsee J-Mech? I expect some wiring differences, but what else should I look for? Any suggestions will be appreciated.

[J-Mech]

Originally Posted by jubilee

J-Mech and Sam-
We did get the Kubota engine to start and run briefly when we first got it out of the old trashed out golf course mower frame. Since it was not plumbed to the radiator, we did not let it run long, but at least we knew it would run. There were no unusual noises other than unmuffled exhaust. From what we have seen, prices for heads can run $700 to $1300 and I am not willing to spend that kind of money on this. Right now I plan to take the engine to my machinist friend's shop. Hopefully, someday one of us can find a head and make use of it.
As for the K321 engine in the 782, what kind of problems do you forsee J-Mech? I expect some wiring differences, but what else should I look for? Any suggestions will be appreciated.

You should be able to find a used head. There are salvage yards for industrial mowing equipment. Where was it cracked? Between the valves? Some cracks aren't necessarily to worry about. Granted, I don't like them either, but I've taken a lot of running engines apart that had cracked heads that didn't have a single problem.

Maybe this will help.
Rebuilt cylinder head Kubota D600/640 $550
Used head E-Bay $350 buy it now
This stuff is out there. It only takes a few minutes of internet searching to find parts.

As far as going to a "K" series in the 782, it takes a different engine cradle, (the one from the 1450 might work, I don't know.) different wiring, (wiring shouldn't be too difficult) different driveshaft (again, the one from the 1450 may work, don't know). Like I said, not too major, but not a drop in. Why not just put another 2 cylinder in it? You can go with a KT, M, CH, Vangaurd, Onan, there are a lot of options.

[Sam Mac]

Originally Posted by jubilee

J-Mech and Sam-
We did get the Kubota engine to start and run briefly when we first got it out of the old trashed out golf course mower frame. Since it was not plumbed to the radiator, we did not let it run long, but at least we knew it would run. There were no unusual noises other than unmuffled exhaust. From what we have seen, prices for heads can run $700 to $1300 and I am not willing to spend that kind of money on this. Right now I plan to take the engine to my machinist friend's shop. Hopefully, someday one of us can find a head and make use of it.
As for the K321 engine in the 782, what kind of problems do you forsee J-Mech? I expect some wiring differences, but what else should I look for? Any suggestions will be appreciated.

I think you would need the cradle from a 1210. They had a Mag 12 in them. I had one and repowered it with a 16HP Vanguard.
Just my 2 cents but I think I'd look for a good used head for the Bota. The pics are how Cub mounted them in the 72 series tractors. If you want hi rez pics send me a PM with your e-mail address.

[TheSaturnV]

Agree with Jonathan, I'd stay with the Kubota plan just a little longer. Having a diesel GT is well worth some extra effort.

[jubilee]

Thanks again for the suggestions guys. I have not totally given up on the idea of putting this or another Kubota in the 782. Right now I am working with limited space and have a 782 in pieces and a K321 in my way. Putting the two of them together would help with storage problems and allow me to play with the 782 a little until I decide what to do with it long term. I do have that nice 1782 diesel Super, just greedy and wanted to have two smokers. The D662 is not going away, but I do need to recover from Christmas before spending a bunch of money on the 782.

[CTRUEX]

Just a thought, but you don't necessarily need to address the cracked head to mock up and fab your motor mounts, driveline, etc. I have plans on building something cool in the near future, and even with having all of the diesel specific things to get dimensions from, I think I'm going to go with a Kohler Command or Chinese v-twin diesel, but I would probably change my tune if a decent Kubota fell into my lap. In other words, the head will be the least of your worries. Sam is right, a cradle and driveshaft from a 1210 will be required for a plug and play K321AQS swap. You could modify the rails from a Quietline to work, as well. I wonder if you could solid mount the K321, with a short oil pan. ???