When I went through the JD Ag Tech program 10 yrs. ago we were told of the problems the 619 had the 10.1 was as my instructor called it a "619 with a controlled head gasket leak" the metric designated slightly "improved" 619 if you will. The Detroit/Deere venture was basically supposed to be the 60 series 4wd tractors powered by 60 series Detroit engines. Our instructors told us the reason it never happened was Detroit couldn't get the oil consumption to an acceptable level so Deere used their 10.1 in the 85 an 8760 and a Cummins in the 8960 this continued in the 70 series. Deere then designed the 10.5 and 12.5 engines which then came out in the 9000 series 4wd's. The 10.5 was discontinued when the Emissions standards for off road engines came about since it would be cheaper to de-rate a 12.5 to replace the 10.5 and would only need to come up with emissions solutions for on engine instead of two. This is what we were told by a career Deere tech and service manager that was teaching in the program I was in.
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