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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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