06-04-2011, 12:24 PM
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Senior Member
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Join Date: Jul 2004
Location: Manteca, CA
Posts: 1,299
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Brent
My Vintage Air instruction say "make sure the compressor centerline does not exceed 90 degrees"
The picture shows the centerline as being where the oil fill plug is located....between the two fittings. So as a reference if you have the oil fill cap straight up on top...dont rotate it more than 90 degrees in either direction from there.
As Mike stated, its so the oil stays in the compressor
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