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onrecess's avatar
onrecess
Explorer
Jun 30, 2019

Onan hot hot hot

I had trouble with my gennie dying for years. I spent a couple thousand at CW, they called in onan twice, kept it for many months. I pulled the fuel pump and replaced it. Runs great. I drove 200 miles across Florida, 90 degrees. No problems. Coming home, I stopped for gas. I shut it off (it exhausts under the fuel filler door.)mWhen I went to start it, no joy. I went to shange the oil. I could barely keep my hands on the cover to pull it. I had to hold the dipstick with a rag, it was too hot too touch. I drove a few minutes to let it cool. After ten or fifteen minutes it started right up. No problems after. I can shut it off and restart, but sitting long enough to fuel up it gets too hot. I looked under it to see where air goes in... There is a perforated metal part where the oill filter and drain is. There is metal plate behind it (touching). There's a pan that covers almost the whole bottom, and the perforated part disappears over that, with a 2" gap the length. Is it open under? I assume there is a fan, is it belt driven? Seems awfully hot. Is this normal? Does your gen set get that hot?
  • Your Onan is AIR COOLED. Also the Altitude adjustment is for the Fuel/air mixture at the CARB. Has nothing to do with cool air circulation. Doug
  • Onan has been building generators since 1925. Would be nice to know which one you have. Model and serial number would help.

    This is the reason generator techs like myself left this site. People asking for help. But not telling us what they have.
  • I checked the carb altitude, it is set to 0, where I am. I started it, there is a lot of air coming out the air exit by the muffler. Someone somewhere mentioned a summer/winter switch, but I don't see one.

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