Home › Forum › Ask A Member › OMC vacuum cut out switch ? › Re: OMC vacuum cut out switch ?
OK Joe, I’ll bite. First, feel good about remembering that this pesky switch is part of the ignition system and needs to be considered when troubleshooting ignition problems, too many of us just overlook the vacuum switch/wiring and waste a lot of time chasing other problems.
I looked in three different OMC service manuals, none posted an actual vacuum gage test/spec for these switches. The manuals just spoke about alternating vacuum and pressure signals to the switch while watching a test light. Please know that I do not have/did not consult the actual service manual for the 1958 Gale 25hp though. You mentioned that your switch seemed fine/un-molested when you dis-assembled it. Perhaps someone installed a switch from a different engine that was incorrect, which would support your theory of different vacuum specs for different engines/switches. Are there any numbers stamped on your bad switch?
I’m assuming the engine works OK now with one of your other vacuum switches installed.
Maybe someone with more in depth knowledge of the history of these systems will chime in.
Don