By the way, here is a link to that article:

http://www.asashop.org/autoinc/nov98/techtips.htm

I notice that he refers to the 1984 & up diesels as a “601, 602, & 603” engine family – is this guy just off on the years they were made? I know that the diesel engines in the 124 cars are different than the 123 &126 cars.