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On an 12.5 overheating
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DRR Sportsman
posted
The generator will run fine then will shut down showing a code for overheating.

I pulled it out today and the belt is still on it, also pulled the thermostat and put it in boiling water, it opened up like it was supposed to.
Anyone got any ideas what would cause this?


Rick Huffman
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Posts: 653 | Location: Burleson TX | Registered: January 24, 2005Reply With QuoteReport This Post
DRR Trophy
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Temp sensor going bad.
 
Posts: 86 | Location: nc | Registered: February 20, 2014Reply With QuoteReport This Post
DRR Sportsman
Picture of Stephen Hughes
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I've seen one with a plastic bag stuck to the radiator, and also one that the radiator was covered in grass, not sure how that happenned, but it was overheating. Since you have it out, i'm sure you have looked at all that and made sure water is actually circulating. All that being said last time i had mine out, i replaced every sensor i could find, the belt, thermostat, etc. just because I didnt want to be pulling it out again any time soon.
 
Posts: 285 | Location: Texas | Registered: September 12, 2005Reply With QuoteReport This Post
DRR S/Pro
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Make sure the belt is snug and that it is not slipping. See if you can move rotate the squirrel cage when shut off. If the belt is tight, than it might be your radiator or your sensor. You can shoot the radiator with an infer red gun to some what determine flow. You might show a big difference in readings at different areas on the core. One was an issue with the belt. Another time the radiator needed to be completely flushed/boiled out.

P.S. I took my thermostat completely out. It runs cooler. I did this when there was no issue with my Onan. I did have my share of high heat codes in mine as well.


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Posts: 1907 | Location: Suffern, NY | Registered: November 03, 2001Reply With QuoteReport This Post
DRR S/Pro
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Last year I had one that was shutting down on overheat and had changed the belt previously.

It was in a Renegade Toterhome / side mounted.

I was able to get the covers off without pulling the unit out and after pulling it apart I found the trouble...

The balancer/outer ring was slipping......it drives the belt and the fan and water pump.

I could turn the outer ring, by hand on the balancer.......

There are a number of different designs of cooling fan drives on Onans....

You might have this problem.....


I also had a 7500 that would Overheat after some time of running but only on very hot day....

Changed everything and ran it for hours and used a temp gun to shoot inlet and outlet temps at the engine and radiator....

The unit had less than 1000hrs but was a 2003......The radiator was coated on the inside with white corrosion.

It was an all metal radiator.....

I replaced it and it never overheated again......an aluminum/plastic replacement radiator........
 
Posts: 1522 | Location: Where ever I am, I'm here and it's me | Registered: March 15, 2007Reply With QuoteReport This Post
DRR Sportsman
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Thanks guys I'll look at these things to see if there are any problems...


Rick Huffman
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Posts: 653 | Location: Burleson TX | Registered: January 24, 2005Reply With QuoteReport This Post
DRR Pro
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rick be sure your air in for cooling is not able to pull the hot air back in. mine was mounted poorly and was doing that .I built a good divider and seems okay now


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Posts: 460 | Location: texas | Registered: February 17, 2006Reply With QuoteReport This Post
DRR S/Pro
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Another big deal is make sure there is no openings in the housing...and the service door is on properly....

The cooling air has to be drawn in across the radiator and circulates up thru the machine and out as designed...

Even if the cover for the output connections is left off the air flow is not as strong....

If it draws it's own hot air back in it's gonna overheat....
 
Posts: 1522 | Location: Where ever I am, I'm here and it's me | Registered: March 15, 2007Reply With QuoteReport This Post
DRR Pro
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Check the radiator and clean it inside and outside real good, a lot of "gunk inside". Also, if there is any small oil leak it will sit on the fins and collect massive amounts of dirt to keep the cooling flow low.


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Posts: 2792 | Location: Rockwall, Texas | Registered: June 25, 2002Reply With QuoteReport This Post
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