Generator overheating

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skydivemark

Well-known member
Joined
Oct 3, 2015
Posts
425
Location
Central Florida
My thoughts are vaporlock, I've been told by cummins/Onan tech rep that the 4ky is good at running in hot temps. I had a similar issue so I added a second fuel pump back near the fuel tank - problem solved.
Mounted the additional fuel pump to the inside of the chassis frame a few feet forward of the rear axle.
Also added a vent to help get cooler air from outside.
 

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steveblonde

Well-known member
Joined
Jan 8, 2015
Posts
3,924
Location
calgary alberta
Air flow, air flow,air flow
I have a 2020 onan 5500 on my toy hauler this last weekend at about 95degrees and running 2 ac units for about 45 mins ut shut off and blowing codes it only has 70 hrs on it. It smelled hot.

I let it cool, cleared the codes, opened up the cabinet door (its in the front of my 5th wheel) fired it up and ran 3 ac units on high. No issues, it breaths from the bottom but the cabinet gets too hot. Open the cabinet door and my problem was solved
 

skydivemark

Well-known member
Joined
Oct 3, 2015
Posts
425
Location
Central Florida
Air flow, air flow,air flow
I have a 2020 onan 5500 on my toy hauler this last weekend at about 95degrees and running 2 ac units for about 45 mins ut shut off and blowing codes it only has 70 hrs on it. It smelled hot.

I let it cool, cleared the codes, opened up the cabinet door (its in the front of my 5th wheel) fired it up and ran 3 ac units on high. No issues, it breaths from the bottom but the cabinet gets too hot. Open the cabinet door and my problem was solved
I've heard others say things very similar. Leaving the compartment open helps a lot for cooling. Just be sure to leave the gen-set covers installed, they direct cooling air where it needs to go.
 

crawford 111

Well-known member
Joined
Mar 23, 2021
Posts
137
Location
dandridge,TN
My 5500 in my coach has never been a problem been running full synthetic oil in mine plus it has a fan which come on I'm guessing at preset setting the fan is about a foot in dia. so a good size but do ask me if I ever seen it running answer is no.
 
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