Quote:
quote:Originally posted by mlh
Part of why the school buses never had a problem they don't put out nearly as much power as the Ford trucks. They don't have enough power to hurt their selves. When you add power cylinder pressure goes way high and you lift the head by stretching the too small head bolts.
Lynwood
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Hate to disagree with you, but school bus versions are pretty much the same power rating, but they don't have to have emissions things like pickups or oil coolers to keep running under really bad conditions. Compression ratios on diesels are always much, much higher than gassers, since they cause ignition of the fuel-air mixture by extreme compression and not a spark. (Those glow plugs are just there to get the thing running and then they do nothing.) I believe the clogged EGRs and oil coolers, and stretched head bolts are really symptoms and not causes. Once the first two happen, engine internals will overheat and all kinds of things will happen.