Onan 4000 microquiet randomly shutting down
I have an Onan 4000 microquiet model #4KYFA26100K. It will start and run and generate power. BUT, it randomly shuts down. Might be after ten minutes or two hours or 10 hours. Lately the best I can...
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OP - Pretty (99 pct)sure you're right about the low oil signal deleted from the newer (many years before yours) 4KY's.
They're splash lubed like a mower, so there's no pressure to monitor and the oil sump's agitated all the time so no way to monitor the level. FYI this is why 4KY also does not have an oil filter: No way to pump oil through one. ONAN had more problems with false oil errors with the sensor so they deleted it and threw the burden on us to check oil more often. That said, there isn't much to go wrong with a 4KY's "oiling system" since there really isn't one.
DO check the oil often. That's an air-cooled engine running 3600 RPM so it's rough on oil. We had a rash of 4KY engine failures a few years ago that seemed to be mostly low oil.
They're splash lubed like a mower, so there's no pressure to monitor and the oil sump's agitated all the time so no way to monitor the level. FYI this is why 4KY also does not have an oil filter: No way to pump oil through one. ONAN had more problems with false oil errors with the sensor so they deleted it and threw the burden on us to check oil more often. That said, there isn't much to go wrong with a 4KY's "oiling system" since there really isn't one.
DO check the oil often. That's an air-cooled engine running 3600 RPM so it's rough on oil. We had a rash of 4KY engine failures a few years ago that seemed to be mostly low oil.
