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Old 01-11-2016, 10:09 PM   #1
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Onan 8KW Annual Maint and More

here I was thinking it was a simple oil change. I started to look at things. The injector pump was leaking, the intake sound box had a hole, Temp gage inop, need to change the raw water impeller.........$600 in parts later, I await. $12 for these little "O rings" in the injector pump. You have to order 4 when you only need 3 cause you will drop one in the bilge!!!

I did discover I did not have to go through Cummins to get parts. I found this website. Prices seem reasonable.

Lawn Mower Parts | Small Engine Parts - Jacks Small Engines
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Old 01-12-2016, 12:45 AM   #2
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Kubota D950 delivery valve holder o-rings. Common leak, easy to replace, cheap rings available from any injection shop.
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Old 01-12-2016, 01:47 AM   #3
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No need to replace the lift pump with an Onan either, I used an aftermarket. Your lift pump will fail.
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Old 01-12-2016, 05:07 PM   #4
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Not replacing any pump, just the o rings....and all of it is OEM Onan/Cummins parts
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Old 01-12-2016, 05:14 PM   #5
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I just tried to add some useful info, my Onan is now on its (at least) third pump. I changed this one out to an aftermarket pump, less money than Onan. Just some info to store away for when yours bakes.
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Old 01-12-2016, 05:16 PM   #6
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Good point. Don't need it to fail while up in the Canadian wilderness
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Old 01-12-2016, 05:41 PM   #7
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I picked up a spare start/stop solenoid for my MDKD on Ebay, at about one 6th the price of the Cummins supplied one. Yes, made in China, but so is the one Cummins supply in a box emblazoned "Genuine Cummins Parts". At that price, worth having.
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Old 01-12-2016, 08:41 PM   #8
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Just curious, Alaskan Sea-Duction, how old is your Onan and the hours on it??
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Old 01-12-2016, 08:53 PM   #9
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1988 and has about 1400hrs.....


It runs good and I am just doing my annual preventive maintenance....Still have the aircraft mechanic in me I guess.
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Old 01-12-2016, 09:28 PM   #10
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Thanks, my 9KW Onan is a 2004 and has about 350 hrs. Guess I still have time before I worry about leaking injection pumps.
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Old 01-12-2016, 09:30 PM   #11
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3900 on mine, '95.
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