The sad thing is that now days replacing a part is often the only way to diagnose, and hopefully fix a problem. I know in the equipment world, Komatsu in particular, often has a step in the troubleshooting flowchart that will get you to a point and then say, "Replace with known good part". From there it goes back into the troubleshooting by asking whether the problem went away or not, and what to do next if it didn't.
In these cases, as well as others, the OEM doesn't give any kind of guide, or even specifications, to check certain critical parts, changing them is often necessary because there's no way to really know whether the part is good or not.
That said, I HATE BEING FORCED TO FIX ANYTHING LIKE THAT. I much rather being able to find an actual problem, and THEN change a part if needed, not just change a part and hope it fixes the problem....and then change another if it doesn't.
In the end I was always taught the greatest computer was the one between your ears. Once you learn to use it, it's not that hard to troubleshoot a problem and get if fixed. Unfortunately too many technicians', NOT mechanics, now days let the digital computer do the work and forget that they need to use their brain.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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