Tried to figure out why my engine is making a terrendous noise, thinking another engine pull is in the near future. https://www.youtube.com/watch?v=_jmouc8fyhU
That sound is not internal to the motor. Something on the outside is making that sound. Alternator bearings? Starter not disengaging? Do you have an air pump for a smog system? Water pump like DSRTRDR suggested?
Remove the fan belt and very briefly run the motor, but not long enough to overheat as the water pump will not be running. While the belt is off, and motor not running, turn the belt run items by hand, feeling for rough bearings or any kind of dragging. This will help test/eliminate items run by the belt, or point towards starter problems.
I'm leaning towards the starter not disengaging from the flywheel as I've heard that sound before with starter problems.
Don
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