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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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