The whole Navistar/Ford dispute comes down to a “simple error” on one side.
Navistar developed a fuel map that was “right on the edge” of the metallurgy and design of their engine. They maximized power and economy without overstressing any component in the engine.
Ford was told to leave this fuel mapping alone, it was wholly outside their experience and WOULD prove expensive if messed with.
Ford altered the fuel map.
Engines with the altered (by Ford) fuel map failed, engines left alone with the Navistar fuel map did NOT fail.
Ford blamed Navistar.
The fact that Ford owns Cummins and needed ANY excuse to get out of its contracts with Navistar AND Chrysler (pretty much taken care of by the illegal takeover) couldn’t have ANYTHING to do with this, could it?
You’ll see Cummins diesels with the “Powerstroke” label attached and on the valve cover(s) rather than the Cummins name. Parts will be interchangeable, but only AFTER the warranty runs out...
The sad thing is, I have been a fan of both Ford and International since the 1960’s. I currently drive 2 Fords and have 2 IHC’s “in process” right now!
This whole dispute is all due to pencil pushers, I’m sure.
Ford does not own Cummins. In fact, Cummins supplies Dodge diesels.