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Onan 4bgefa26100f no fire to plugs


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  #11  
Old 03-20-2017, 09:49:35 PM
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Billy J Shafer Billy J Shafer is online now
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Default Re: Onan 4bgefa26100f no fire to plugs

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Originally Posted by MKF View Post
The board came with an advertisement for a device called a slick stick made for cleaning the slip rings. Has anyone used one of these? Do they work as advertised? Or is there another procedure for cleaning them? Please see attached.
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Those work very well. Doesn't require allot of pressure. Just enough to polish the rings. Just be careful with rotating parts.A good rewind shop will also have them. Called a brush stone.
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  #12  
Old 03-21-2017, 07:57:20 AM
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Default Re: Onan 4bgefa26100f no fire to plugs

So you do clean the slip rings while the generator is running? Do I need to turn the 120vac breaker off while I am cleaning the slip rings?
Thanks again for everyone's help!!!
Mike
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  #13  
Old 03-21-2017, 01:07:44 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

Turning off breakers won't de-energize the genhead. Voltage across the slip rings and brushes is 18-60 VDC and typically 36 VDC at no load. But to be safest I suppose you could unplug the AC voltage reg (VR1), then genhead will only make ~ 1-2 VAC out the 120 line from residual magnetism.

Not making 120V your control board will shut down engine when you release start button. I suppose you could unplug or disconnect power to coil so engine doesn't start and stress the plastic starter gear. (just let starter crank engine).

Or you could hot wire power to spark coil and fuel pump so engine runs and you don't have to keep starter turning and wearing starter gear. Some gen specs had 6V coils and/or gas pump, I forget which. Could put a volt meter on it while running/cranking to see if it's 6 or 12V.
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Old 04-02-2017, 05:31:12 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

1. I cleaned the carburetor, the unit starts and runs as long as I press the start switch as soon as I release the switch the unit dies. Could this be a problem with the low oil pressure switch? Is it something that I can "clean"?

2. The slick stick is too wide to go in the slots on the exterior cover. Should I remove the brushes and insert it through the opening and crank the starter to clean the rings or modify the stick so it will fit? They look pretty dirty so I am sure they need to be resurfaced.

As usual your input is greatly appreciated.
Thanks
Mike
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  #15  
Old 04-02-2017, 07:15:43 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

Never used a stick. I think your supposed drag the side of it against rings, but I never tried one.

I use a strip of scotch brite under the slip rings, held by a fork modified as I mentioned in post 10.
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  #16  
Old 04-03-2017, 08:46:35 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

I resurfaced the slip rings. reinstalled the brushes hit the start button and it runs great. I want to thank everyone for you input and help!!! One more question is there a reason that someone would put silicone on the bolts for the brushes and the plug for the voltage regulator? Do I need to reseal the bolts for the brushes?
THANKS !!!
Mike
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  #17  
Old 04-03-2017, 09:09:34 PM
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Default Re: Onan 4bgefa26100f no fire to plugs

Think silicone on the brushes bolts is so water doesn't puddle and rust the threads.

Don't remember seeing it on my reg's connector.
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