The information that I am citing comes straight from the 60 series tractor brochure. The 6076 engine had a 33 percent torque rise, a higher top ring placement on the pistons, dome shaped combustion chamber in the cylinder head, 7 hole injection nozzles, whereas I think the 466 had 6 holes in the nozzles. There are also noticeable differences in the casting of the engine block, too. I believe the injection pump has an electronically controlled governor on the 6076 and the lack of the aneroid valve. The 6076 does not seem to be nearly as difficult to start in colder weather conditions, and the sound of the engine is quite different, as the engine has a more noticeable and sharper firing/ignition, which I think comes from a little higher compression ratio and the fuel injection system. The 466 in the 50 series, when running sounds like the 466 from the 40 series, whereas the 6076 sounds like the 6081, and I do hesitate to say this, but it does also sound more like the 8.3 liter cummins when running, as compared to the sound generated by the prior Deere models.
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