Re: Leakdown Testing
usually somewhere either on the gauge or in the instructions it will give you a range of air pressure needed so that the gauge will function properly----my particular gauge is a Sun it ranges from 70-200 pounds needed----turn the engine to a position where BOTH rocker arms have NO tension on them so that the neither of the valves are open at all-- then go do your test---we pump air into the cylinder , disconnect the air line to that cylinder then re- attach the air hose and take the reading--works for us just remember to do your routine the EXACT same way every time--- hot ,cold, medium temp engine odd numbers first whatever how ever it works best for you
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