::sigh:: Old cars had instructions on adjusting valves because you needed to. Improvements in manufacturing processes means that valves and valve seats simply don’t wear the way that they use to. You may still need to change valve shims if your clearance is out of tolerance, but on most cars that’s going to be well over 100,000 miles before service is needed. It’s also a really tedious, long job, and takes tools that most people aren’t going to have. (I have done it multiple times on a motorcycle; that’s a 10,000 miles service interval b/c the engines on the bikes I ride redlines at 18,000rpm, which means significantly more wear on engines, and higher chances of thing like valve flutter.) Cars are vastly more complicated than they used to be, because they’re also far, far more efficient, and last far longer; it used to be a big deal if a car made it to 100,000 miles, and now a car that dies at 100k is considered an unreliable lemon.
Well, they don’t last far longer as a whole, but the advances in machining tolerances and material science, the mechanical internals can go far longer without anything more than fluid changes.
As far as longevity, soy based wiring harnesses, poorly shielded ECUs, and borked software updates are what are killing cars these days.
::sigh:: Old cars had instructions on adjusting valves because you needed to. Improvements in manufacturing processes means that valves and valve seats simply don’t wear the way that they use to. You may still need to change valve shims if your clearance is out of tolerance, but on most cars that’s going to be well over 100,000 miles before service is needed. It’s also a really tedious, long job, and takes tools that most people aren’t going to have. (I have done it multiple times on a motorcycle; that’s a 10,000 miles service interval b/c the engines on the bikes I ride redlines at 18,000rpm, which means significantly more wear on engines, and higher chances of thing like valve flutter.) Cars are vastly more complicated than they used to be, because they’re also far, far more efficient, and last far longer; it used to be a big deal if a car made it to 100,000 miles, and now a car that dies at 100k is considered an unreliable lemon.
Well, they don’t last far longer as a whole, but the advances in machining tolerances and material science, the mechanical internals can go far longer without anything more than fluid changes.
As far as longevity, soy based wiring harnesses, poorly shielded ECUs, and borked software updates are what are killing cars these days.