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Re: Onan issue [message #366821 is a reply to message #366486] Thu, 16 September 2021 08:28 Go to previous messageGo to previous message
lqqkatjon is currently offline  lqqkatjon   United States
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
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Senior Member
I was under the impression, if you jumper from pin 9 to pin 5, and start the generator, that you are basically by-passing everthing on the control board including the LOP. so that is all that we have done.

Looking at Duane's information, it might be a little more complicated then that. this being a dinosaur board currently it does not really have "pins" wires are soldered direct to board, so jumpering is a little more difficult, but can be done. we can always re-install another old board too.

but isn't the LOP switch itself just a grounding thing? so if a person disconnects the LOP switch entirely, it should be open circuit and fool it into thinking the oil pressure is fine?

we are dealing with fresh oil. It is Ed's, but I believe he is running SAE 30 VR1. I know I realy topped off the oil and probably a little over filled the oil last week, and did not change a thing. I think he sucked some oil out yesterday to meet the top mark and did not effect.

the reason he did that is he went down to the onan dealer and talked to them. He also bought onan coil and condenser, and I think new plug wires. he talked to a couple tech's. one was an idiot, who told him overfilled oil can cause shut down, then followed that statement up with he needs to read the codes off the diagnostic light near the switch. Ed had to explain to him that the diagnostic light on onan generators were not around in the 70's. Probably not the 80's or 90's either? Another Tech came out and seemed to have a better grasp of a 70's onan model. He did not like the idea of the Harly coil, and there is a relationship with spark plugs, coils and plug gaps that can cause some issues. So now it has a Onan coil in it, and still seems to be same problem.

I think to add fuel to the fire, I might run over there this weekend and we can take the heads off and do a quick carbon clean up. His is a low hour onan, but one never knows. That is easy thing to do. I can't imagine that being a problem because of how well and smooth it runs when it is running. I am still wondering if we are running out of fuel and there is an issue with the new fuel pump.

Jon Roche 75 palm beach EBL EFI, manny headers, Micro Level, rebuilt most of coach now. St. Cloud, MN http://lqqkatjon.blogspot.com/

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