Hi Nodge I am going to use the light on pully wheel and see for metal dust and let you know. For the last 20 years, I only changed all filters including crankcase filter once and oil changes. Still all engine has original parts now nearing to 88k miles.Sounds like crankshaft pulley delamination to me. Check of silvery dust around the pulley area.
Would you suggest a timing belt and pulley change, how about thermostat and water pump. I really want keep this engine. Any parts that needing change at 88k miles. Thank you in advance.