Quote:
Originally Posted by Diseasel300
Not sure about the MB smog pump, but the Ford engine-driven pumps had carbon vanes in them. The black stuff that came out may have just been carbon dust, not exhaust soot.
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I think you're right on the carbon vanes.
There's some really good info and pjctures of all the pump internals disassembled and those vanes look like they're carbon to me.
http://www.peachparts.com/shopforum/tech-help/186139-w124-smog-air-pump-rebuild.html
Must have been carbon dust buildup on either the blade ends or cylinder walls leading to the scraping in my case.