Are there mettalic flakes in it? Also, look below and see if some of the “grey” is being flung in a radial a pattern elsewhere.
I have seen an alternator that is eating the outer bearing set make that pattern from the bearing rotation and deflection/deposit from the belt. It will stick where there is oil or grease to trap it, but the metal flakes so small as to disappear effectively elsewhere.
You can take a large flat-blade screwdriver as a stethoscope and you can hear if the bearings are making excessive noise.
Quote:
Originally Posted by jleonard
And it looks like a lot of dust to me. More than there should be.
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Roger that. I would observe if the alternator is stable when running and not creating excessive belt wear, also.