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Old 03-10-2020, 02:29 PM   #5
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 5,598
Originally Posted by 10/10ths View Post
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.

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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