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Hi,
Listening, seeing, feeling and even smelling has to be used.
It is an acquired skill by being patient in your steps of thinking.
After that process, we call it learning and working on the issue. Then with is confirmation of the learning process we will say. Jeez, I don't want to do that again! (:-)
I think you found out why the car was dropped like a hot potato!
From the looks of the video tear down, Done OUT of the car, is not one for the "faint of heart" or thick hands or tools!
My suggestion is since this is a low mileage think simpler that.
It should be something that's not running in oil like a timing chain.
The wear guides should be longer lasting than 150K since its self adjusting for slack.
The video showed quite a bit of stroke.
You said the rest of the car was beautiful and I would hope that this expensive model car would have been appreciated by the previous owner. But then, those people can afford kids that may not!
Try to segment the sound or sounds into a category of noise that might be created.
Sound is a vibration of the air waves in a frequency high to low depending on its mass.
A plused emission is most likely from a reciprocal motion that begins and ends.
One a rolling member like a bearing of a water pump or idler pulley is more continuous.
A pitch change is usually from a load changing inside an alternator of a bearing about to seize or something repaired and not done right the last time!
Sign of these times! Wham- Bam thank you Mam!
Was it a woman that sold the car?
Serpentine belts and pulley's can get creative in making strange noises with the above scenarios.
It was noted in the you tube video, provided by the other poster, that there was on certain models a one-way clutch that was excessively tighter in free-wheel, than he thought it should be?
Just from the way they sealed off the holding bolt, from access, was a totally "user unfriendly" design!
To be only be Removed and Replaced with new and it was mentioned in the video, that there was NOT enough room for a conventional harmonic balancer for accessories. I didn't think that it was for accessories to begin with, but for internal crankshaft stresses?
A Six cylinder and not the Five anymore?
Seems the engineering fellows painted them selves into a corner and left it on the "sales and service" department to deal with it!
Volvo has eaten a share of bad reviews in the maintenance costs arena!
From the other videos the list of special tools to work on the engine must have been what scared the PO into selling it!
It's No wonder that to be a mechanics in this day and age, you have to dig certain customers and then network with other mechanics to survive!
With You Tube and Forums the sharing of knowledge helps us deal with today's overly fraught technologies in our lives!
I guess I'm just a plain outright old guy, that is lucky, to still have several comfortable RWD 240s, to get shoved around in!
(:-)
Phil.
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