| Re: [GMCnet] Onan ignition questions [message #322585 is a reply to message #322584] |
Wed, 23 August 2017 22:48   |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma:
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Senior Member |
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Ken,
I just got in the office.
I'll grab another new coil and take a OHM reading and get back.
Sice were also an ONAN dealer, we could have had one in the wrong bin.
On Wed, Aug 23, 2017 at 8:22 PM, Ken Burton wrote:
> Ok, I have been all afternoon and early evening trying to get an Onan
> running.
>
> I initially had a no spark or intermittent spark problem.
>
> This is a wasted spark (plugs in series) system.
>
> I initially found that the secondary coil was open (infinity). I already
> had an order coming from Jim K. so I had him (actually Nick) add a new Onan
> coil to the order. While I was waiting for it to arrive, I called Blaine
> and asked him to meter the secondary of a used Onan coil that he had. He
> read 14.5K ohms.
>
> When the new coil arrived from Jim K. I metered it and it read 40.5 K
> ohms. That confused me but then I thought with my bad hearing that I
> mis-understood 14.5 for 40.5.
>
> So I installed it and no spark. I metered through the plug wires and coil
> and still saw around 40K ohms. I cleaned and gapped the points and spark
> plugs. I tested the plugs on an aviation plug tester. I watched the
> points open and close with a test light. I checked the positive side of the
> coil for consistent +12 volts.
>
> Finally I went to another hangar and took a used wasted spark coil off of
> an Onan engine that was mounted on a John Deer. It read the same 40.5K
> ohms across the secondary and still no spark. I called Blaine back and he
> read his again. 14.5K ohms
>
> Tonight I got home and dug out and Onan maintenance manual. It says that
> the secondary should should read 14K ohms.
>
> So now I do not understand what the differences are between our NH Onans
> and a these two 40.5 coils I used. I also do not understand how Jim could
> be
> selling 40K genuine Onan coils and not had previous complaints. I have
> not talked to Jim K yet to see if there is more than one Onan coil part
> number. I'll probably call him tomorrow.
>
> At this point I think I'll probably hop in the airplane tomorrow and go
> get the used one that Blaine has.
>
> One thing I have not done yet is to disconnect the condenser / capacitor
> across the points. There is a possibility that the condenser / capacitor is
> leaking.
>
> THIS IS NOT a complaint in any way against Jim K. or Applied GMC.
>
> I am just looking for ideas. I'm open to any thoughts.
>
> Ken B.
>
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
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www.appliedgmc.com
1-800-752-7502
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