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post #1 of (permalink) Old 02-23-2017, 04:53 AM Thread Starter
RedCurl
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Air compressor oil continues to be black

I got this air compressor from my dad that passed away.
I removed the opil and as expected it was black.
So I removed the front plate (it is a single piston reciprocating compressor, probably 50 years old) and cleaned the well. I then inserted more clean transparent oil and ran the compressor for a few minutes and changed the oil. It was black. I did this 3 times and it was always black with black sediments and reducing amounts of very fine metal particles.
So I filled the compressor well with diesel fuel to rinse it...and it was black
Then I inserted turpentine (10 times) to wash it and all turp fills came out black!
What am I doing wrong?
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