I have noticed that the fuel economy has gotten better on the tractors until about 3-4 years ago. The new ones with the new tier 4 emissions actually went back wards a little. Personally I would not own a new tier 4 engine that was out of warranty. They are where the cars and trucks where 30 years ago on emissions. It takes time to get the bugs out.
As for the high fuel pressures causing more problems. They definitely do that.
Example: I have a 1993 JD 6400. It has over 13,000 hours on it. It has just a newer version of the old style pump and injectors in it. I have replaced the injectors twice in that time. The last just a year ago when I had a head casket leak. They did not check too far out of spec but I replaced them while I was in there.
A good friend has a JD 6430 loader tractor. It has the electric injectors and higher fuel pressures. He only has 3500 hours on the tractor and it is on the 3rd set of injectors. It is missing now but he said the injectors cost $490 each. So you have almost $2000 plus labor. The old pencil type are under $100 each.
I think that new engines with the emission controls on them will not hold up for long. Any EGR motor will not last as long as one without it.
I also think the total cost of ownership is going to be higher per hour of operation on the newer stuff. The tractors with the particulate filters on them are looking at 4-5K filter cost at the 4000-5000 hour mark. So you are talking about a buck and hour just for the filter. Plus the Tier 4 junk added about 5-10K to the up front price.
So much of anything newer than the first generation of fuel rail injection systems is going to give more trouble and cost in the long run.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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