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01-24-2012, 08:07 PM
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#1
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Senior Member
Monaco Owners Club
Join Date: Jun 2003
Location: St. Cloud, FL
Posts: 1,528
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Onan Quiet Diesel Generator
I have an 8KW Quiet Diesel generator that seems to surge up and down when it runs. I can understand it doing this when it's powering a heavy load, but it seems to do it any time it's running. Does this seem normal?
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 Bob 2006 Monaco Camelot 40PDQ
US Navy Carrier Battlegroup 1959/1965
Winters in Florida, Summers in Blue Ridge Mountains
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01-24-2012, 08:13 PM
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#2
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Senior Member
Join Date: Jan 2011
Location: Pensacola, FL
Posts: 2,457
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Mine is very stable. The RPMs increase only when a load is added. If you have an ammeter you can check to see if some load is switching on and off.
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2008 Itasca 37H
2011 & 2012 Len & Pat's "One lap of America"
27K miles & 41 states in 13 months
 Yellowstone Lake 6-1-2012
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01-24-2012, 09:37 PM
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#3
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Senior Member
Country Coach Owners Club
Join Date: Dec 2010
Posts: 7,802
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You might have some load being applied that you don't know about. You can see if it is a load or a generator problem by flipping off the breakers on the generator while it is running. That will remove all loads from it.
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01-24-2012, 09:42 PM
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#4
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Senior Member
Monaco Owners Club
Join Date: Mar 2011
Posts: 889
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The RPM's won't change with load, but the amount of diesel being put into the engine will increase under load to maintain the correct speed to provide 50 Hz. This will make the engine sound different under load than no load.
Paul
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Paul Whittle
2005 Monaco Signature 45'
525 HP/1850 Ft Lb ISX-15/6-Speed Allison 4000
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01-24-2012, 10:39 PM
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#5
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Senior Member
Monaco Owners Club
Join Date: Jan 2001
Location: Foley, AL
Posts: 1,247
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Change the fuel filter.
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Rex
2001 Monaco Diplomat 40' PDQ - 08 Honda CR-V
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01-24-2012, 10:51 PM
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#6
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by pwhittle
The RPM's won't change with load, but the amount of diesel being put into the engine will increase under load to maintain the correct speed to provide 50 Hz. This will make the engine sound different under load than no load.
Paul
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Some of the Onan's do in fact vary their RPM with the load between 1,800 and 3,600 RPM. Some do not. You can go to the Onan site and look at the specs.
We have a Power Tech 8KW, it has a Kubota 3 cyl engine. It runs at a constant 1,800 RPM, and takes .72 GPH at full load.
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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01-25-2012, 04:11 AM
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#7
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Senior Member
Monaco Owners Club
Join Date: Mar 2011
Posts: 889
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I was not aware of that. My Onan gas generator was governed to produce the correct frequency. My Kohler diesel generator uses the same principal.
Thanks for the info. I learned something new!
Paul
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Paul Whittle
2005 Monaco Signature 45'
525 HP/1850 Ft Lb ISX-15/6-Speed Allison 4000
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01-25-2012, 05:53 AM
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#8
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Senior Member
Monaco Owners Club
Join Date: Feb 2009
Posts: 1,496
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Quote:
Originally Posted by Rex
Change the fuel filter.
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Ditto
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Del & Lori 2007 Diplomat 40PDQ - 2020 Grand Cherokee TrailHawk Hemi Toad, M&G Brake System, Blue Ox.
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01-27-2012, 10:10 AM
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#9
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Senior Member
Country Coach Owners Club
Join Date: Dec 2010
Posts: 7,802
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Well, how does it run now?
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Linear Mode
