I have been hearing a new sound from the engine compartment on my 84 300D, so I set up a stethoscope with a length of plastic tubing. I put an earplug in one ear and the end of the tube in the other and explored around. At first I suspected the water pump but got nothing from around there. Next was the turbo unit. When I got close in around the top, it sounded somewhat like a small popcorn kernel was bouncing around in there. Could this be a bearing going bad? I have 314K on the car and the turbo unit was replaced a few PO's ago at 117K. Not sure why the original went so early, but if the story is correct, this one has just under 200K on it. My dipstick shows that it is almost ready for a quart of oil and I will add some tomorrow, but I doubt this has anything to do with it. I changed the oil a few thousand miles ago. Anyone have any advise?

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