Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 04-22-2015, 07:52 PM   #1
DJK's Avatar
Join Date: Mar 2011
Posts: 31
Onan/Cummins burnt up

We have (well had) a 5500 in our 2013 Itasca motor home. We were using the genny with just one air unit and the refer on when my son yelled fire. The genny was smoking bad, when I got there it had shut down and fire was out. All the wiring on the outside looks fine, I think it is the winding's.
Has anyone else had a problem?

Dennis & Sandy Brooksville, Florida
Dogs : Bosley (Pit mix) & Cisco (Chi) & Elly May (Chi)
2013 Itasca Sunstar 35F - 2012 Jeep Unlimted - 1996 Dyna Low-Rider
DJK is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 04-22-2015, 09:02 PM   #2
Registered User
Damon Owners Club
Workhorse Chassis Owner
Join Date: May 2008
Location: N. Palm Springs CA (in winter)
Posts: 2,421
Has the cause of your genset over heating and catching fire determined? Using wrong weight of oil, Low/no oil, clogged oil filter, oil blow-by - leak/coatiing on outside of generator, or maybe an over due oil change?

I have a Onan Marquis Gold 5500 genset and it came close to catching fire near 300 hrs of use. I was in Redding CA and it was triple digits so I had the cargo door up for more ventilation. I was working the Onan under load as required monthly for an hour. I happened to walk by the RV and saw a 18 inch puddle on the asphalt. It was gasoline leaking heavily from the second (redundant) fuel filter. After shutting down the generator I discovered Onan discontinued the 2nd fuel filter and replaced it with a filter by-pass P/N A029S253 . I was lucky I saw it, lucky it did not catch fire , and lucky I was parked at CampingWorld where I got the replacement parts.
I installed the by-pass and a new fuel filter. No problems since. I did the work myself where I was parked.
I use 15W40 synthetic oil in my generator because synthetics are slicker than conventional oil, they allow for smoother, cooler engine operation. We also know that synthetics flow better in cold weather, making engine starts easier and offering better protection. In addition, synthetics resist viscosity changes at extremely high temperatures that can break down or evaporate molecules in conventional oil. When this kind of deterioration happens, metal-on-metal contact may occur, causing permanent damage to the engine.

Doggy Daddy is offline   Reply With Quote
Old 04-23-2015, 04:38 AM   #3
Senior Member
dabrooks's Avatar
Tiffin Owners Club
Join Date: Sep 2012
Location: Maryland
Posts: 801
I am not sure but I think Onan generators are warranted for 3 years.
dabrooks is offline   Reply With Quote
Old 04-23-2015, 06:08 AM   #4
Join Date: Apr 2015
Location: Oak Grove Minnesota
Posts: 50
Was this a gas or LP Gen?
samschudi is offline   Reply With Quote
Old 04-23-2015, 11:32 AM   #5
Senior Member
rjsupersonic's Avatar
Join Date: May 2013
Posts: 388
If the cover on the generator is off or not on properly it will cause overheating, not sure if this applies to you're situation.
2007 National Sea Breeze
rjsupersonic is offline   Reply With Quote
Old 04-23-2015, 09:30 PM   #6
Junior Member
TbearKline's Avatar
Join Date: May 2006
Location: Minneapolis, MN
Posts: 10
I had my Generator burn up in January. Sounds like the same thing, I was exercising the Gen and it started smoking then stopped. You can get the error code, I think mine was 45. I took the MH to the Onan Cummins NPower service center. The Stator windings were burnt out, they also found the bolts holding the Stator housing broken.

Unfortunately my MH is a 2011 and the 3 year warranty was expired. Cost about $450 in parts and a lot more in labor (the broken bolts had to be drilled out, taking a lot of time). Works great now.

I'd find the closest service center and take it in under your warranty.
TbearKline is offline   Reply With Quote
Old 04-23-2015, 09:37 PM   #7
Senior Member
vsheetz's Avatar

Fleetwood Owners Club
Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 8,435
My 5500 burnt up the brushes under the load of two air conditioners for a few hours. Brushes in turn scored the stator contact surface...
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
vsheetz is offline   Reply With Quote
Old 04-28-2015, 07:25 AM   #8
Senior Member
Ford Super Duty Owner
Join Date: Dec 2010
Posts: 117
The idea to "load" the generator once a month is not just for the engine component but also for the generator component. Those winding, brushes and the rotating parts absolutely need to be brought up to temperature and exercised. Any corrosion on the rotor or stator or brushes is just asking for trouble.

Chuck n Terri
2017 Heartland Bighorn 3875FB
2016 Chevy 3500 Duramax
Lostdog is online now   Reply With Quote

cummins, onan

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Ford V10 chassis transmission slippage stillamook Ford Motorhome Chassis Forum 33 05-06-2015 10:26 AM
Burnt Ceiling under Light Fixture UsualSuspect Fleetwood Products Owner's Forum 15 01-13-2015 07:26 PM
Hydraulic System Fluid smells burnt Coma Monaco Owner's Forum 9 09-20-2014 01:14 AM
Burnt Wires freedogger RV Systems & Appliances 5 08-12-2014 08:57 PM
2008 Southwind ramblinboy Fleetwood Products Owner's Forum 13 05-16-2014 05:24 PM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 07:36 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.