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Do you have an A1 or A2 series? A2 correct? You should have the 8.3, unless someone changed it out for something else. You’ll want to download the technical manual as mullaney mentioned and start going through them.

Better start soaking the exhaust mnt studs/bolts now. There is some stuff out there called knocker loose that is suppose really good. But since pb blaster is more readily available, get that stuff to soaking, esp during operation/running the eng

Check from turbo, back at every connection point.

I ran in to that in an old dodge company tck. Diesel exhaust smell in the cab, esp with the fan blower on. Tck shop could find a noticeable soot trail in the eng bay or under cab. My 936A2 had an exhaust smell till i replaced the rusted out muffler.

EDIT: Not sure. You would have to give them the part number from the tech part manual or contact a cummins repair shop/dealer for their stocked p/n and see if napa carries it, or if the cummins shop/dealer has it in stock. I got the pump, stat and gaskets from dieselpartsdirect.com and i think...

i was having an issue similar and i drained my system, put in probably way more vinegar than need be, but along with some CLR in the radiator, changed out the water pump (what a damn headache that was) and replaced my stat. other erroneous reading from the temp gauge, things seem to be good now