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Old 03-18-2015, 09:12 AM   #13
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Join Date: May 2014
Location: S.California
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It sounds as if your vacuum is normal. The difficulty with overcoming the vacuum when you try to remove the oil-filler cap indicates that the diaphragm of the AOS has failed.
Suggest you " Search " AOS failure before you proceed -it is a frequent subject.
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