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Old 05-15-2016, 02:07 PM   #1
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Onan 8KW QD Oil Change

Today I changed the oil & filter in my Onan Genny. The manual says it should hold 3qts of oil with filter change. I first added the 3qts and ran the unit for a few minutes to fill the filter. I let it sit for a couple minutes and checked the dipstick which showed add 1qt. I added another qt of oil so it took 4qts to fill the sump.

Has anyone else found this to be the case on their units?
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Old 05-15-2016, 04:47 PM   #2
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I have changed the oil in a 8k a couple times. From my recollection it was 3 quarts total. Even with changing the filter.
4 quarts seems high. It's worse to run overfilled they say then even u dear filled... Go to the manual and all else fails call Cummins
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Old 05-15-2016, 10:12 PM   #3
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Per the owners manual the lube capacity is 2.8 quarts. Was the generator level when you checked it? That can throw it off.
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Old 05-15-2016, 11:30 PM   #4
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I've had two Onan 8K generators over the last 12 years and I do all of my own servicing. The Onan 8K only hold 3 quarts. You need to drain a quart back out. Don't forget, the dipstick needs to be screwed/pushed all the down and then back out to check the oil.
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Old 05-15-2016, 11:35 PM   #5
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you may want to change the fuel filter too very easy to do there is also a spark arrestor that needs to be emptied
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Old 05-16-2016, 07:05 AM   #6
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Quote:
Originally Posted by johnnyreno View Post
you may want to change the fuel filter too very easy to do there is also a spark arrestor that needs to be emptied
Ditto on the fuel filter. Not cheap but they plug and cause all kinds of symptoms.

Yes that is too much oil. As suggested. Insert the dip stick all the way.
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Old 05-16-2016, 10:22 AM   #7
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Talking about dip sticks. The plastic end can and will break off. Best to replace the stick with an all metal one.
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Old 05-16-2016, 10:24 AM   #8
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If you are going to change the fuel filter do yourself a favor and buy the correct wrenches if you don't already have them. They are called flare nut wrenches, they will make life a lot easier in the tight space where the filters are mounted. I bought mine at harbor freight for around $10. The plug in the exhaust system is not easy to get to. You need a long extension and a flashlight. I also use a shallow socket to get the plug back in, you want some threads showing outside the socket in order to get the plug back in. Be careful not to cross thread the plug and use anti seize paste when re installing it. Never had much soot come out but I pull the plug and start the generator every year when I change the oil.
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Old 05-16-2016, 10:26 AM   #9
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My 7.5 diesel manual says 3 qts and that's what it took to bring it up to the full line.
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Old 05-16-2016, 10:37 AM   #10
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Do you use synthetic oil?


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Old 05-16-2016, 09:00 PM   #11
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Well I checked the dipstick to make sure it was inserted completely, it was. The level now shows overfull so I have drained it down to mid-range on the indicator. I'm not sure why it was off but okay now. The MH was sitting level so I guess that was not the issue.
Thank you for all the replies, it's good to have so many folks willing to share their experience.
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Old 05-17-2016, 11:03 AM   #12
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Quote:
you may want to change the fuel filter too very easy to do
Your Onan must be a heck of lot different than mine, cause the fuel filter on my QD7500 is a royal pain to change. Even with the proper wrenches. It's tucked up in a little cubby hole and little slack in the metal fuel tubes to get it aligned right for reinstall. When my hands are in the cubby hole I can't see anything, and fuel runs down my arm all the time I'm trying to get it hooked back up. Of all my filters, coach & cars, it's the one I most dread changing. So much that I avoid it and change only when really needed.
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Old 05-17-2016, 12:22 PM   #13
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This is a link to THE RV GEEKS page on generator service. It has some nice tips for all aspects of the job.
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Old 05-17-2016, 07:45 PM   #14
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Quote:
Originally Posted by Gary RVRoamer View Post
Your Onan must be a heck of lot different than mine, cause the fuel filter on my QD7500 is a royal pain to change. Even with the proper wrenches. It's tucked up in a little cubby hole and little slack in the metal fuel tubes to get it aligned right for reinstall. When my hands are in the cubby hole I can't see anything, and fuel runs down my arm all the time I'm trying to get it hooked back up. Of all my filters, coach & cars, it's the one I most dread changing. So much that I avoid it and change only when really needed.
I won't change mine again. Last time I brought the replacement fuel filter with me to Speedco when I had the engine oil and filter changed. They changed the generator fuel filter at the same time with no added service charge.

That's what I'll do from now on, no more fuel running down my arm.
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