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Diesels - Time to overhaul?
Not sure how you would judge a engine from a boat to a vehicle, but this is the best I can come up with. Genrally you can see atleast 300,000 - 500,000 miles from a diesel in a truck. Most the time more. But this is when I would not hot dog it anymore,just taken it easy. 400,000miles - 500,000miles / 60mph = 5000 hours - 8300 hours
But I have come across several boats that have had 9000 - 10,000 hours on them. They would be the ones I would more than likely rebuild if I where to buy. Anything under 8000 hours, I would not worry about unless you just a getting poor performance from it in burning oil, fuel, or drop in rpm when running.