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.
w124 Smog Air Pump rebuild
Must have been carbon dust buildup on either the blade ends or cylinder walls leading to the scraping in my case.