Originally Posted by nwarner2010
I believe it is mechanical.
I'm diy inclined when it comes to cars, I do everything myself. Not sure how much different it is working on buses, never worked on big stuff before.
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alot of it is similar.. only bigger.. often simpler than modern cars...
some of it is more dangerous.. like working on air brake components. . esp spring cylinders..
and alot of it seems unfamiliar to most because most of the busses are diesel with turbo chargers.. some are computerized.. the mechanical ones there is usually something cut and dry..
ie hard starts may be to the fact the glow plugs dont work.. or the fuel may be draining out of the fuel line back to the tank.. or the injector pump timing is mis-adjusted.. and of course dirty injectors, dirty fuel filters.. bad fuel.. electronic fuel solenoid (if equipped) is lazy at opening..
I do a lot of observations and notes of sound, sight, feel (every engine has a rhythm and a vibe), smell. etc when an engine runs correctly.. so that way I can get idea if it seems like its sick or not quite right...
when I bought my bus, I started up a couple with the same engine as mine to see if they all sounded the same.. and they did.. so I felt unless there were 3 with the exact same issue than likely mine is running right...
its all learn as you go and read as much as you can..