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					Originally Posted by 10/10ths  A mechanic that I trust on these machines told me that the manometer test is really useless. 
 The AOS can fail without warning.
 
 The membrane is either good or it’s not.
 
 Just R&R it every four years.
 
 Cheers!
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Strange, using this "useless test", we have correctly diagnosed and replaced many failing customer AOS units before they could fail catastrophically and potentially kill the engine...………...
		 
				__________________“Anything really new is invented only in one’s youth.  Later, one becomes more experienced, more famous – and more stupid.”  - Albert Einstein
 
				 Last edited by JFP in PA; 03-10-2020 at 02:35 PM.
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