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Old 06-10-2013, 02:17 PM   #1
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Onan 8000 quiet diesel shutting down code 33 fix

After many hours of frustration before coming up with the fix, i'm thinking I can save someone aggravation and money by sharing my experience. My genset has 405 hrs. mounted in a 2003 Travel Supreme. Everything was going along fine until one day the genset started shutting down after only a few minutes of running under load. The fault code 33 indicated an overheating shutdown. The fix turned out to be a combination of temperature switch and a cooling system in need of a good flushing. When I removed the temperature switch it was sludged in so bad the lower half broke off and stayed in the housing. When I tried to remove the broken piece with an easy out it dropped into the water jacket instead; hope it doesn't cause problems later. I finally got a new sending unit installed. Then I gave the unit a good flushing with Fleeetguard Restore according to directions on the container, I also changed the thermostat and gave the unit an oil change for good measure. Touch wood everything is running as it should. I'm thinking a lot of problems could be avoided by flushing the cooling system as a matter of general maintenance. A good quality 50/50 diesel anti-freeze, anti-corrosion should be used to re-fill. Drive safe.
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Old 06-10-2013, 02:27 PM   #2
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Thanks for sharing! We need all the "fixes" posted that we can get. Hopefully your post will help someone else who's getting that error code.
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