compared to a new vehicle with overdrive, use 60 miles per engine hour as the hours are not clock hours but revolution hours. ie when the engine slows down, the hour meter slows down.. so we figure 60 miles per tach hour. but remember.. you have an industrial engine, that will never run high revs, so the wear will be at least 1/2 as much, over an engine that revs up over 4000 rpms.
No timing chains to streech out, lower cyl wear, and usually more oil quanity so oil wear particles are less, no gunning or washing down the walls with excess fuel, no egr or pvc valve on the older tractors. so your looking a 500,000 mile to 1,000,000 mile engines, very very similar to the over the road trucking engines. So 10,000 hours is normal on lots of tractors.
Most damage done is.. lack of correct antifreeze and coolant treatments, incorrect oil type or wornout, dirty oil, over heated, or run lean or due to stopped up/flooding carbs on the gas models..
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