the ones we messed with had the coolant filter(looked like a small oil filter) that had some kind of additive inside the filter, they were real strict about replacing them, and only using oem filters. On a side note, they sent me to Detroit Diesel to learn how to work on the CNG conversion of these motors, they screwed the injectors out, and screwed spark plugs in, DD had all the conversion crap on the outside including the first mass produced, fly by wire throttle plate on the American Highways. The motors worked pretty good, the only problem was CNG is not regulated per mix of gasses, so where ever the trucks went, they had to send an engineer out, have the cng sampled, then reprogram the ecm to handle the mix
|