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Old 08-26-2014, 11:59 PM   #1
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Well I just got back from the Black Hills and everything was beautiful. The genny was running better than ever until the last day it would crank over great and start but as soon as I let go of the start button it dies. Any idea on what could be wrong? it is a 1994 Onan 2.8 KW
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Old 08-27-2014, 03:08 AM   #2
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Quote:
Originally Posted by g1g
Well I just got back from the Black Hills and everything was beautiful. The genny was running better than ever until the last day it would crank over great and start but as soon as I let go of the start button it dies. Any idea on what could be wrong? it is a 1994 Onan 2.8 KW

did you check the oil. onan will keep shutting off when low on oil.
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Old 08-27-2014, 12:24 PM   #3
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I was thinking the same as Gerry.
Next would be to make sure there is enough gas in the van tank for the Onan pickup. Usually at least 1/4 tank is needed. One forum member posted that his needed 1/2 tank and he reinstalled the pickup tube to work until approx 1/4 tank.
After that it would be checking electrical connections. Then fuel pump etc. But low oil would cause the symptom you describe.
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Old 08-28-2014, 01:37 AM   #4
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I was reading the troubleshooting guide after I posted and it mentioned low oil so just checked it and it is full. I dd change it about 8-9 hours run time with Mobil 1. I tried it again and still dies when I let go of the switch.
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Old 08-28-2014, 11:18 AM   #5
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Default Re: onan

I read through some Onan Troubleshooting.
For "Engine starts but stops when start switch is released" #1 is low oil and #2 is "Defective low oil level switch"

Instructions for #2 are: "Disconnect low oil level switch and check set operation. Replace if defective"
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Old 08-28-2014, 03:00 PM   #6
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Default Re: onan

Quote:
Originally Posted by markopolo
I read through some Onan Troubleshooting.
For "Engine starts but stops when start switch is released" #1 is low oil and #2 is "Defective low oil level switch"

Instructions for #2 are: "Disconnect low oil level switch and check set operation. Replace if defective"
This does seem to be a fairly common failure, based on what shows up on the Yahoo board. IIRC, the control board is often at fault, and a relay on it gets bypassed when the button is pushed so it will run with the button pushed. Oil level switch also, and much easier to check out.
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Old 09-06-2014, 01:53 AM   #7
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I sure hope that you have better luck finding your issue with it than I did. I started calling ours a ghost. For almost a year there would be days that it would start normal and run great no complaint. Then out of the blue it would only run while the switch was depressed, and quit as soon as you let go of the switch. We even had a Cummings Onan service shop pull the generator and trouble shoot. They replaced the starter relay, and total bill was $1400.00. Mostly labor because the relay was only $65.00. Three days later it was doing the exact same thing again. This continued for months where I would try and start it, and sometime it would, and sometime it would not. Finally this summer I pulled it myself, and tried inspecting all I new with no luck. I drove to a different Cummings facility a dropped it there with a lengthy letter of what all had been done, and told them it was not reliable, and I needed it to be, and do some real diagnostic checks please, and call me when they found something. In a nutshell they determined that the generator needed a new rotor assembly at ($351.1, voltage regulator ($239.7, valve cover gasket, brushes ($15.04), and rotor bearing o-ring. All totaled they were going to charge me $1700.00 for everything. Well we had just put $1400.00 in it in February, and now another $1700.00. And the killer was they only give a 90 day warranty. Well we thought it all out and decided against having $3100.00 invested in our 9 year old generator, and only have 90 days to make sure all was ok. I ordered a brand new 2800, and it cost me $2152.00, and has a 3-year warranty. I think it was the right decision for us, but it has not been without its issues either. The brand new units are not exact matches. The dimensions of the cabinet are different, and all of the fuel, electrical and exhaust hookups are in totally different places. So it has required me re-engineering a new way to install it all. I have managed to get everything finished now except the exhaust pipe. What a night mare, it is 1 1/8 inch OD tube and absolutely no one has dies that size I have found. I have managed to run the new system with a temporary exhaust setup, and it is smoother, quieter, and I do like it. After I manage to get the exhaust pipe issue resolved I really think it will all be fine, but unless the person doing this project has plenty of fabrication skills, I would not recommend taking the route I did. I really hope that you have better luck with yours. They were very thorough on their diagnostics though, and they felt the items I quoted above were the root of the problem, so you may be looking at rotor, voltage regulator and brushes problems. Best of luck finding the problem and getting your rig back in service.
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Old 10-10-2016, 04:18 AM   #8
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FWIW, The Onan folks I spoke with do not recommend synthetic oil in the 2800 generator.
Something about it does not have an oil filter, so they recommend conventional oil.
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Old 10-11-2016, 09:54 PM   #9
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[QUOTE=Deano;49222]FWIW, The Onan folks I spoke with do not recommend synthetic oil in the 2800 generator.
Something about it does not have an oil filter, so they recommend conventional oil.[/QUOTE

I generally change my oil at the same interval that you would change regular oil
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Old 10-11-2016, 10:25 PM   #10
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Any air-cooled engine benefits from using synthetic oil due to the ability of the oil to perform better in high heat. I use royal purple full synthetic in mine since it only uses one quart.
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