Originally Posted By: ecotourist
Originally Posted By: dgunay
Originally Posted By: brages
Originally Posted By: andrewp1998
A good mech will listen to see if they need adjusting, Im at 227 and no need
What does a tight exhaust valve sound like? Because those are the ones that will "burn" you...
You will only hear if it needs an adjustment when the engine is cold. You won't hear a difference when it's hot.
A "mech" wouldn't let your car sit in his shop for several hours. You gotta decide yourself if it needs an adjustment.
Here is a before & after video. The difference is pretty noticeable.
https://www.youtube.com/watch?v=CkH6NDmuzMs
You can detect a loose valve by sound. But actually the problem is a too tight valve (usually an exhaust valve) because it will burn. Makes sense - if it doesn't seal fully, hot gases will get by and erode the surface. A loose valve makes tapping noises, but a tight valve sounds fine - until the valve burns.
So no you can't identify a problem valve by sound.
I plan to have the valves in my V6 Accord adjusted at 200,000 miles. Intake valves tend to loosen. And exhaust valves tend to tighten.
That's exactly what I found in both of my J-Series motors, although it wasn't all of them. I would say out of the 24 there were maybe 12-16 that needed adjusted. Most all of the exhausts were a smidge tight but there were plenty of intakes that I just left alone.