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Old 08-20-2012, 02:30 PM   #43
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Huh?? Modern oils dont need "cool down" periods. Any mechanical engine has an oil pump. There is no "dry" start regardless of how many RPMs the unit was turning when shut off.
1. According to the Onan Owners manual. 965-0138 page 9. Run the engine without load for 2 minutes to cool the engine down. @. taking a load off the generator does NOT slow it down. The engine runs at 1800 rpm loaded or unloaded. 3. Onan has a oil pump but many small gas engines are splash lubed and do not have a oil pump.
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Old 08-20-2012, 04:56 PM   #44
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GA,

Taking the load off of the GAS Onans may not slow them down but taking the load off of a QD sure does.

Jim
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Old 08-20-2012, 08:01 PM   #45
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Over 1K hours on my 5500 gas generator. Runs great.
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Old 08-20-2012, 08:22 PM   #46
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The little single phase 5k gens we have don't have turbo... but every three phase 60kW on up to 1.5MW will.

Do any of your diesel gensets in your MHs have it?

Oh ya.. vegas39 OP.. that engine is way under-used for that rate of oil consumption...
Not that I know of and I know our 8.0 KW doesn't, it's a liquid cooled 3 cyl Kubota and the larger ones (10.0 and 12.0 KW) use a 4 cyl Kubota as I remember with no turbo. The run at 1800 rpm and really never get run hard. They just kind of idle along.
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Old 08-21-2012, 07:12 AM   #47
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GA,

Taking the load off of the GAS Onans may not slow them down but taking the load off of a QD sure does.

Jim
Jim: You are correct the quiet diesel is different. The generator we are talking about here is a gas and runs at a constant 1800 rpm.
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Old 08-21-2012, 07:27 AM   #48
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The Emerald 6500 on our 90 Bounder had just over 4000 hrs on it when we sold the coach. Still ran fine and consumed less than a qt/150 hrs oil change interval.

Yes, the no or low load cool down cycle is still recomended by Onan.
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Old 08-21-2012, 07:41 AM   #49
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Our Onan diesel gen has 7700 hours on it and runs like new. I was told they should go at least 12,000 before rebuild.
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Old 08-21-2012, 08:13 AM   #50
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Our Onan diesel gen has 7700 hours on it and runs like new. I was told they should go at least 12,000 before rebuild.
The diesel generators are a whole nother ballgame. They last much longer than the gas. We sold a Allegro bus with a Onan quiet diesel to a christian rock band. These guys traveled all the time and stayed in church parking lots. There were no hookups. The generator ran 24-7. The generator had over twenty thousand hours on it the last time I saw it.
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Old 08-21-2012, 08:28 AM   #51
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I was told by the Onan instructor and Field Engineer (Good Sam Rally Onan Class) that my generator should operate for thousands of hours if they are properly maintained. There is a service schedule in the back of my Onan 6KW Diesel Generator operator manual and I follow this schedule. If 47 years in aviation has taught me anything it is to follow the maintenance schedule
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Old 08-22-2012, 07:00 AM   #52
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still nobody has debunked the "cool down" theory here. Doesnt make sense to me. Also the "monthly exercise" recommendation is kinda silly too. Ask any seasoned mechanic about "pickling". Guys I know with classic cars or motorcycles... take a few hours to remove fuel/contaminents from their rides when they put them into storage. If they want to use them... it would take fresh fuel and 30 mins to get them running again.
Im sure onan (or other genny companies) are hedging their bets since most RVs are stored outside or in weather which can cause condensation inside the generators engine case and eventual bearing/ring failure.
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Old 08-22-2012, 08:09 AM   #53
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still nobody has debunked the "cool down" theory here. Doesnt make sense to me. Also the "monthly exercise" recommendation is kinda silly too. Ask any seasoned mechanic about "pickling". Guys I know with classic cars or motorcycles... take a few hours to remove fuel/contaminents from their rides when they put them into storage. If they want to use them... it would take fresh fuel and 30 mins to get them running again.
Im sure onan (or other genny companies) are hedging their bets since most RVs are stored outside or in weather which can cause condensation inside the generators engine case and eventual bearing/ring failure.
I, for one, am not looking for anyone to debunk the cool down requirement and if they tried I would ignore their suggestion.

I am not a diesel engineer however I am a gas turbine engine engineer and on jet engines there is a cool down cycle and limits on how quickly you can restart the engine to prevent compressor rub. It allows the various parts to stabilize. Unloading my 6KW diesel genset (turn off A/C) and waiting a couple of minutes is not a big deal nor harmful. The same goes for exercising my genset periodically…no harm.

I have a lot of money invested and I am not going to pick and choose what OEM (Original Equipment manufacturer) recommendations/requirements to follow regardless of all of the wisdom contained on this forum. Maybe once I am out of warranty and have a lot more experience with my Class A DP but for now I follow the rules.
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Old 08-22-2012, 11:05 AM   #54
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I have an 07 Onan 5500 with 2200 hours. Still runs great. It does make a clattering noise when I turn it off. Have to have it looked at as soon as the season is over.
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Old 08-22-2012, 11:12 AM   #55
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When I went to the Onan factory school, they said the design life of the generator was ten thousand hours. According to Onan the number one reason for oil usage is shutting down the generator without letting it cool down. The load should be removed from the generator and the generator should be run about five minutes to cool down before shutting it down. If the the generator is shut down under load without being cooled down, You will have a dry start and the cylinder walls will scuff and cause oil usage.
Wow! 10,000 hours design life, was that for a gas or Diesel generator?
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Old 08-22-2012, 11:16 AM   #56
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When I went to the Onan factory school, they said the design life of the generator was ten thousand hours. According to Onan the number one reason for oil usage is shutting down the generator without letting it cool down. The load should be removed from the generator and the generator should be run about five minutes to cool down before shutting it down. If the the generator is shut down under load without being cooled down, You will have a dry start and the cylinder walls will scuff and cause oil usage.
WOW, I never knew that ga traveler! Once again, you come through with more information! Thanks! I have done just that, shut off the genny from a full a/c load with no cool down. In the future I will remember this information. Thanks!
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