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Re: JD 4630, and 730 diesel

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G-MAN

05-29-2002 10:56:32




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Paul, I can't speak to the 730 issue, as I don't have much experience with two-cylinder diesels. However, I have worked on quite a few 30 series Deeres, and they are pretty strong tractors. I have personally dynoed a 4430 that was putting out 230 hp. I'm not saying that it would have lived long at that level, as it was a 10,000 hour tractor that some idiot had gotten carried away with turning the smoke screw - but it did pull it.
The only real problem I've seen with 4630s engine-wise is that they don't have much of a torque curve - once you get below rated speed the power falls off in a hurry. Those 404s are wound pretty tight in those tractors. If a guy wanted to really play with one without spending gobs of money, he could probably find a good used 466 and swap in pretty easily. If you wanted to stick with the 404, I would recommend pulling the head and making sure it's flat and the valves/guides/seats are in good shape. Also check liner protrusion and make sure it's up to snuff - because at higher horspowers that is critical, to keep the head gasket from blowing. Unless you get real crazy, I don't foresee any rear-end problems, as long as everything is in good shape. The bottom line is that it really depends on what you want. If you want to go to the local pull and not be embarassed, you can take it to the dealer and have them crank it up for the pull, and then turn it back down afterward. It really comes down to what you want to do with the tractor and how competitive you want to be. Just my two cents.

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