Dads 966 had a D-414 - the non-turbo version of the DT-414 in the 1066.
The Melrose engines were actually very good - IMHO better than John Deer's, Ford's, etc.
Great tractor - plenty of torque rise and tough as nails. We used it a lot (plow, disk, harvester) and it was a reliable problem free tractor.
Lot of farmers turned up the injection pump especially on the 1066 - some got a 30hp+ increase. Engine easily took the additional HP but transmission problems began when you really cranked up the HP.
Regarding the cavitation issue - all of the Melrose engines had the cavitation issue to some degree. For that matter it's hard to find a wet sleeve Diesel engine from any manufacturer at that time that didn't have this issue.
The fix was to keep the DCA-4 additive at the correct level. A coolant water filter was a popular add for additional protection to prevent cavitation.
I heard a couple of theories about the filter - one that micro air bubbles form around the dirt particles that end up drilling holes in the sleeves - second was that the speed of the circulating coolant creating turbulence that made it more favorable for bubbles to form and that the filter reduced the speed of the circulating coolant just enough to make it less favorable for bubbles to form.
No matter which theory you believe the combination of additive and filter worked to eliminate the problem.
I haven't really kept up on Navistar (IH's truck division) but they used the Melrose engines (DT-466 version was popular) long after IH sold the farm division to Tenneco. If you cant get a filter from CashIH you could get one from Navistar and adapt it.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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