Onan 4000 Microquiet KY no start - Oil level switch bypass
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Jun-17-2013 01:40 PM
The rig has been parked for almost a year on a slight incline with the rear of the genset lower than the front. I have periodically exercised the genset, but a couple of months ago it would not start. My current project is to get it started and tuned up for our summer vacation.
Model: Onan 4000 Microquiet - 4KYFA26100K Spec K
S/N: D030493001
The genset cranks but fails to start. The fault code is 36.
Inspecting what I can see without removing the genset from the motorhome, looking through the throat of the air intake, the carb looks very clean, with no evidence of varnish. I verified fuel flow, drained the bowl, added SeaFoam liquid to the gas line, sprayed SeaFoam spray into the air intake, and changed and gapped the spark plug but it still won't start.
I was wondering if having the RV parked at an angle for an extended period might be activating the low oil switch. How can I identify the low oil switch wire from an accessible connector? The connector above the solenoid is the only one I see.
Also, the LED light on the remote control does not work.
Does anyone know how to access the low oil sensor wire from an accessible connector, or have any other ideas to get the genset started? It only has 10+ hours on it.
Or alternatively, any suggestions for service in the Boulder, CO area?
Thanks
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Jul-05-2013 07:31 AM
2017 F-150 XLT 4x4 SuperCab w/Max Tow Package 3.5l EcoBoost V6
2017 Airstream Flying Cloud 23FB
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Jul-04-2013 07:37 PM
I am thinking about installing a see-through in-line fuel filter right before the carb so that when I put the RV in storage, I can measure some Sta-Bil or SeaFoam into the fuel line, run the genset a little, and watch the stabilizer flow into the carb.
Does that, and exercizing the genset monthly, sound like a good idea?
Thanks.
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Jun-20-2013 10:14 AM
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Jun-19-2013 03:18 PM
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Jun-19-2013 01:33 PM
Its called the float bowl drain valve in the op manual you may have a little water in the bottom of the carb so try to drain it.
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Jun-19-2013 12:26 PM
"I would start by taking the gasoline solenoid off the carb at the bottom and clean it out. When you take it out there is a spring and pin in it . While you have it out apply 12 volts to it to make sure the pin pulls in that's what lets gasoline in the carb..."
How can I get the solenoid off with the carb on the genset and the genset in the Trail Lite compartment? I can't seem to get a wrench on the fuel solenoid because the carb bowl drain is in the way.
Thank you.
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Jun-18-2013 05:11 AM
2014 Forest River Berkshire 390RB
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Jun-18-2013 04:03 AM
dan-nickie wrote:
I have a PDF manual I can email you if you want to PM your email to me.
Edit: Beat me to it.
But...my manual is different and I see there is a picture of the low oil switch on page 10-2 if you want it.
I found this text that may help:
Disconnect the low oil level shut down circuit.
Locate the lead from the low oil level switch that
comes out of the top the oil base below the
spark plug. Separate the in-line quick connect
where lead S2 J1-7 connects to the low oil level
switch.
Hey Dan could you send me a copy of your manual. Packkelley@gmail.com
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Jun-17-2013 08:00 PM
JimL
08 Chevy 3500HD, crew cab, dually, Duramax/Allison
Crossroads Cruiser CR305SK14, Onan 3.6KY
Retired AF CMS (E9) Power Generation and Onan RV genset Level III tech
Grand Strand Sams
Blog.rv.net
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Jun-17-2013 07:43 PM
I tried starting the genset with the engine running and it cranked fine but did not start.
I looked through the service manual but could not identify exactly where the connector pinout for the low oil switch is. I'll have more time to look tomorrow.
Thank you for the service manual references.
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Jun-17-2013 02:02 PM
Edit: Beat me to it.
But...my manual is different and I see there is a picture of the low oil switch on page 10-2 if you want it.
I found this text that may help:
Disconnect the low oil level shut down circuit.
Locate the lead from the low oil level switch that
comes out of the top the oil base below the
spark plug. Separate the in-line quick connect
where lead S2 J1-7 connects to the low oil level
switch.
2014 Forest River Berkshire 390RB
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Jun-17-2013 01:58 PM
This may help. I would start by taking the gasoline solenoid off the carb at the bottom and clean it out. When you take it out there is a spring and pin in it . While you have it out apply 12 volts to it to make sure the pin pulls in that's what lets gasoline in the carb. I don't believe the spec k had a low oil pressure switch but check the parts manual on which spec had one. Good luck the others will be along shortly to help. Ps if you have a multimeter make sure you have 12.7 volts to your start solenoid and with start switch pushed you have 12.7 v coming out of start solenoid. No light on start switch sounds like low battery or bad connection at start solenoid.
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Jun-17-2013 01:58 PM
Jim, "Don't get even. Get odd."