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03-24-2021, 09:05 AM
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#1
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Senior Member
Join Date: Jul 2007
Location: Estero, FL
Posts: 386
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Generator Smoke on Startup
The Onan RV QC(G)5500 genset seems to have a lot of exhaust smoke on startup. Lasts about 10 - 15 seconds. Unit runs fine, power works. Oil level is OK. Unit is 3+ yrs old, and has about 150 hours on it. It is in a 2018 unit that I purchased used in October of 2019. The genset had been service in March of 2019.
I also see a little oil spitting from exhaust when it first starts.
Any suggestions for what to look for? I'm going to get an appointment with my local Cummins service center to check. I suppose it could have an oil leak internally, which collects and then burns off when it starts?
Amy thoughts appreciated.
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Bob & Katie Cook
Estero, FL
2018 Newmar CS 3710/2012 CRV
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03-24-2021, 09:40 AM
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#2
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Senior Member
Join Date: Feb 2012
Location: Lake County, IL
Posts: 1,584
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The smoke may be an indication that it is running rich. Does it just happen on start up when fully choked?
Are you sure that it is spitting oil, it might is be water that had condensed?
Joel
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Retired electronics engineer. Avid paddler & birder.
2011 Silverado 2500HD, diesel, 4x4,crew cab, 8' bed
Palomino Puma 253FBS (27' 5er) & '94 19' Class B
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03-24-2021, 10:02 AM
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#3
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Senior Member
Join Date: Sep 2018
Posts: 1,944
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What color is the smoke?
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Tom & Jeri
2018 Coachmen Galleria 24T Li3
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03-24-2021, 01:07 PM
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#4
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Senior Member
Join Date: Jul 2007
Location: Estero, FL
Posts: 386
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Only on startup. Runs fine otherwise. I'll check on drips from exhaust, wether it is oil or moisture.
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Bob & Katie Cook
Estero, FL
2018 Newmar CS 3710/2012 CRV
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03-24-2021, 01:08 PM
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#5
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Senior Member
Join Date: Jul 2007
Location: Estero, FL
Posts: 386
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Smoke is blue.
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Bob & Katie Cook
Estero, FL
2018 Newmar CS 3710/2012 CRV
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03-24-2021, 09:20 PM
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#6
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,951
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Quote:
Originally Posted by BCook57
Smoke is blue.
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Carb needs cleaning, gasoline can go bad in as little as 30-60 days if not treated with Seafoam or Stabil or similar product during storage.
Try dosing your main gas tank with Seafoam next fill-up, it will clean the fuel lines, injectors in main engine and carb on genset.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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03-24-2021, 10:12 PM
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#7
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Community Moderator
Join Date: Aug 2011
Posts: 6,200
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Blue smoke is from burning oil.
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03-25-2021, 09:14 PM
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#8
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,951
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Quote:
Originally Posted by pasdad1
Blue smoke is from burning oil.
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You are right, I stand corrected, black smoke is overfueling.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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03-26-2021, 02:52 PM
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#9
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Senior Member
Join Date: Jul 2007
Location: Estero, FL
Posts: 386
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Thanks all for your suggestions.
I was able to get the MH into a Cummins/Onan shop. They could not recreate the problem, but did a full diagnosis, let it run both under 50% load and full load, and could find no issues.
The previous owner may have used too light oil when adding oil to the unit. I'm going to keep using it and keep an eye on what happens.
BTW, the Cummins shop here in Ft. Myers, FL was very accommodating. Got me in in one day, called when they said they would, and charged $75.
__________________
Bob & Katie Cook
Estero, FL
2018 Newmar CS 3710/2012 CRV
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03-27-2021, 06:48 AM
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#10
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Senior Member
Join Date: Mar 2016
Posts: 1,756
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X2 on running some Seafoam through to clean carb.
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