Question for diesel gurus (strange failure 6.9idi)
This won’t help with your problem, but did you know the IH/Navistar 6.9 has a bit of a connection to Chrysler.
The engine that became the 6.9 was developed as a 446 ci gas engine known within IH as the MV8.
During development Chrysler expressed an interest to purchase that motor for use in motor homes and large trucks as a replacement for its own discontinued big block motors. The MV8 launched in late 1974 in the midsts of the 70’s gas crisis and Chrysler was cutting product lines and they dropped any interest in the MV8. From the mid 70’s to the early 80’s IH made a only couple thousand MV8’s there was no market for that gasoline motor. In the mid 80’s IH initiated a plan to change the MV8 into a diesel motor as diesels were gaining popularity. Many design changes were made, but the way IH designed engines back then the basic architecture stayed, as it was plenty strong. There was a new cylinder head, pistons,,,,, the machining and assembly lines were retooled. And the 6.9 worked well. IH signed a contract with Ford. And Ford put the 6.9 in their F250 and F350 trucks and the 6.9 started a line of engines that went from the 6.9IDI to the 7.3L to the 7.3T to the 7.3IDI to the 6.0l to the 6.4L. As mentioned earlier, provided good paying jobs to a lot of folks for nearly 25 years. Today the plant where that string of engines was built is completely gone, flattened.
New construction is going on there for a distribution terminal.
