Originally Posted by Sockeye
Thanks all. It is from a private party who bought it this august from a school district and they have given up on their just begun conversion. I will ask about engine hours -no idea what that means and suspect the seller won't either. But an interesting new concept for me to learn about. And thanks for the information on injectors. In any case someone else has an appointment to view the bus before me so it may be gone in a couple of days.
the reason engine hours are important is that school busses spend a lot of time going slowly, so the engine is still spinning, pushing fuel through the injectors, running bearings, etc.. and in cold climates this may mean it has been run cold a lot which can take its toll on an engine..
on the navistar dash there are often 2 gauges at the bottom.. one is an odometer and one is an hour meter.. (lower left)..
as EC mentioned, the computer also stores the hours.. a well cared for engine can run many hours. and miles.. the injectors can and do wear out on these engines.. 200k on a diesel is no big deal but super high hours can be if it is wildly high..
also navistar dash panels are notorious for going dead or being flaky at some point in the engine's life... the data stored in the computer tends to be more accurate, however you need someone with the interface and software to read it..
most generally speaking if it sounds good, runs smooth, doesnt smoke, the WARN light is not lit while its running, the coolant and oil look good then its a good bet that its in running order waiting for itsnext road trip..
in my opinion the weak links of a 7.3 are the injectors (can cost upwards of a couple grand to replace them with quality reman).. glowplug relay (easy cheap fix), and oil leaks... (some are easy to fix others are a pain)..