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Old 07-07-2015, 12:09 PM   #1
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4k Onan hot weather adaptation alteration.

Hi
I have run into a problem with our 4K Onan genny. It would shut down in places like a traffic jam in the Mojave (Vegas to LA) or driving through the deep South. When we needed it the most it died. I tried all of the adjustments without any luck. I found out that many of them have a temp sen sot in the intake that shuts it down when the ambient air reaches 130f. I have a IF temperature gun so I did some checking. The tarmac often gets to 150f here in S FL. No wonder. I tried leaving the door open a crack and a few other things without much luck. Coachmen, in its infinite wisdom, put the generator behind the drivers side wheel well where the radiator heat washes through it. The intake in the genny box is in the front where it sucks the radiator and engine heat in as well as the brake and tire heat. I read where some folks ran dryer vent hose from the box to in front of the radiator but the suspension and a tight space made it tough and it would still be right on the road. Here is what I did.



I am still in the midst of painting so it is not perfect yet and this is not all of it. The louvers come from a Sea Ray engine compartment and were meant to exhaust. I just turned them around. I cut a hole and screwed them on. I am repainting the lower part of the RV so I am painting them.They were sanded and primed with plastic primer before the color coat went on. I will be spraying the clear later.
I did not block the old intakes to the compartment. I used foam to direct the air flow from these intakes to the intakes on the genny's own case. I'll post more picks in a day or so.
The generator now draws its air from outside of the RV about 3' off of the road. That helps a lot even when standing still in traffic. When moving the scoops direct air through the generator. We spent a few days in Death Vally during August without any problems at all.
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Old 07-07-2015, 10:13 PM   #2
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Mine will shut off when motor home gas tank is at 1/3 rd full. Does yours ?
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Old 07-08-2015, 05:56 AM   #3
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Kahoona,
I was looking at that venting system. Looks like I have another project. :-)

MnDRice.
Thats normal, the pickup tube that feeds gasoline from your main gas tank sits above the bottom of the tank, usually somewhere around 1/4 tank. Keeps you from accidentally running your gas tank empty by running the genny.
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Old 07-08-2015, 07:10 AM   #4
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Mine will shut off when motor home gas tank is at 1/3 rd full. Does yours ?
Yes it actually shuts off just below 1/4 tank. The Temperature shut off is actually in the instruction manual that I bought from Onan. It is a known thing but is not a problem most of the time because the locations atr cooler. It is just that this model is positioned so that the engine, road, tire and brake disc heat all are channeled right through it. While we were in Death Vally, after the mods, it worked great. The only thing we found was that, since it was so hot, we did not shut the generator off when er left the coach for less that 20 minutes. The heat build up from the Onan's motor would prevent starting until we were under way for a few minutes to push fresh air into it.
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Old 07-08-2015, 08:20 AM   #5
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Where did you get the louver panel?
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Old 07-08-2015, 10:41 AM   #6
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Where did you get the louver panel?
"The louvers come from a Sea Ray engine compartment"
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Old 07-08-2015, 05:04 PM   #7
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"The louvers come from a Sea Ray engine compartment"
I got them on eBay and I just went by measurement. I got a set of 2 and put them in in a row.
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Old 07-08-2015, 05:09 PM   #8
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Kahoona,
I was looking at that venting system. Looks like I have another project. :-)

MnDRice.
Thats normal, the pickup tube that feeds gasoline from your main gas tank sits above the bottom of the tank, usually somewhere around 1/4 tank. Keeps you from accidentally running your gas tank empty by running the genny.
I will have pictures and more info posted as soon as I get the time. I can post it on the Mirada site too since it affects Miradas directly. It is not associated with fuel supply. It happens at all tank readings. It is a temp sensor inside the case to prevent overheating from high ambient air temps. A known item that is only a problem when the manufacturers put the unit in the hottest place on the RV.
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