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Originally Posted by GMAN
I would be prepared to do an in-frame at around 750,000 miles. I have spoken to owner operators who have gotten more than a million miles on a Cummins before having to do an overhaul. It is all about the maintenance.
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Can't speak to the ISX per se. My old truck had an ISM, the small bore little cousin. At 750,000 miles, it started to go all to hell. Kept having problems with injectors until they figured out it wasn't just one or two but all six that needed replacing. Then it broke a ring, the A/C compressor broke off, and a couple other things. It really needed an in-frame bad, but the company dodged that bullet by closing its doors instead. I limped along with that gimp for a few months, and then sayonora, no more job.
In contrast, my old old truck had... Dang. I keep forgetting what it was. NS-9? The one that came before the N14. It was an old mechanical engine, and we got every bit of 1.75 million miles on it, and that motor was still running, albeit not as well as she used to, when she went to the scrap heap. We were hauling light stuff, which helped, but that old truck did me right proud. I parked her before she finally gave up on me, barely. It was a near thing, but you can't fault a truck for being in nearly catastrophic need of a rebuild at pushing two million miles.
I'm a Cummins man. Driving an N14 now. I love that engine too.
