Case sends owners out to cummins for parts. It's a case/cummins politics thing.
Actually its a Cummins/Fiat thing. When Case closed the old IH plant in Neuss am Rhein in 1996 and transferred the production of the Maxxum to Doncaster, UK, they had the engines built in the UK Cummins plant. Fiat had a failed engine development deal with Nissan and decided to buy the tooling from the Neuss plant to build these engines under license. the B and C series Cummins engines were jointly developed by Case/Cummins as CDC, Consolidated Diesel Corporation, in the early 80s
Now when New Holland bought Case, it was getting nasty. Fiat, who was building Cummins engines under their own name for their highway trucks (and using the Ford 6.6 and 7.5l ag engines for their tractors) thought they now owned the rights once owned by Case in the CDC deal between Case and Cummins and stopped paying royalties, Cummins thought not so. Cummins developed their 6.7 liter version and patented it in every possible way, for no other reason than to stop Fiat from copying their modifications to the original B series design. Result: Fiat (FPT, Fiat Power Train) engines in New Holland tractors have 104x132 bore x stroke, Cummins 6.7 engines have 106x124 bore x stroke.
Comments from Cummins employees on the FPT mod is that they simply ground away on diameter of the crankpins, in order to fit the bigger crank swing in the existing engine design, and therefor FPT marine engines are limited to 3000rpm because of harmonic vibrations. FPT however, says that they dont need the wear of high rpm because of their SCR (no EGR) emission technologies, they can simply put more oxygen in a single cylinder stroke without overstraining the engine components at racing performance.
Case is Fiat owned, and even Case MX parts are harder to get nowadays because that production line was sold to Argo, the Italian owner of the also Italian Landini brand, which now owns the production lines of the Doncaster IH plant and the rights to the historical name McCormick.... And Argo sold the St. Dizier (France) transmission plant to the Chinese YTO....
All in all, i'm not fond of buying any used Ford, Case, IH, David Brown or Steyr, any of the brands swallowed up by New Holland because their parts backup for older non-Fiat based models sucks. Delivery times are soaring, and if they are available, the price is jaw-dropping. And they send you the wrong part because a Case MX part has been renumbered from Case to New Holland, and is sometimes sourced from McCormick/Landini.