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Old 03-02-2020, 02:56 AM   #2
JFP in PA
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 5,508
You can test the AOS by replacing the oil fill cap with a test cap hooked up to a digital manometer. Fully warmed up, you should see no more than 5 inches of water vacuum signal.
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