Ok, Dr. PepperMRJ, perhaps you could elaborate.
I've tried the mechanics stethoscope before and my novice experience is yes you can hear noises as you touch the areas around a pulley, alternator, etc, but you hear all the rotational noises as they are transmitted throughout the engine block. Even a perfectly good bearing is noisy and there is noise from other sources, ie power steering pump, alternator, etc, therefore it never seemed that useful. Obviously, I'm missing a technique. Perhaps the issue maybe that the noise you hear through the air may not be the same frequency you hear transmitted through the engine block and accessory housings. I just tried a bell shaped physicians stethoscope and that was more useful as I did not touch the engine around each accessory, but just placed the stethoscope in the vincinity of each accessory bearing.
Signed a bit deaf and dumb.
Tuesday, March 27th, 2007 AT 8:38 PM