Its the black alternator belt being ground down and slipping. Sometimes I get a complete dusting of the front of the engine..
A couple of causes I have seen on my 25 year old 1GM:
1. Rust on the pulley surfaces grinds away the belt. A bit of work with emery cloth on the pulleys seemed to help.
2. The pulleys arent lined up, so the belt is constantly sawing on one side of the v-groove - I found about 1mm misalignment between the engine and the alternator, using a straight edge and a lot of fiddling. Adding a washer between the alternator and the engine block on each mounting bolt seems to help.
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Re: black dust from alternator- normal or?
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