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| Re: [GMCnet] Onan ignition questions [message #322619 is a reply to message #322585] |
Thu, 24 August 2017 16:44   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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I have found that capacitors for Onan engines come at least two ways.
One is a thin metal tube, with a pack of foil and insulation wound into a
minature toilet paper roll. Then, a black fibre washer follows that with a
insulated conductor emanating from the center of the disc. No sealant
visible. The end of the can is then rolled over the edge. I have found this
type to fail often.
The second type, still has a metal outer shell, but has what looks to be an
epoxy sealant on the open end with a conductor coming through the sealant.
O have rarely known those to fail. I expect that the latter type are
military spec. I always try to find them if available. Keep the known good
ones for a spare, or, install an electronic ignition. (Better)
Jim Hupy
Salem, Or.
On Aug 24, 2017 2:27 PM, "Fred Hudspeth" wrote:
Ken,
I have had similar experience to that you described with two 6.5KW Onan gen
sets - the one in my GMCMh and the one in my Alaska Airstream Mh . After
running all of the "traps" you did, I found the ignition capacitors to be
the culprit. After replacing the capacitors, with all other aspects of the
ignition system on-spec, the gen sets performed normally. 'Caution - some
capacitors, especially NOS, may be defective "right out of the box". I had
that experience with OEM capacitors from a supplier near my Texas home. If
available, 'best to test, using a known good capacitor.
'Hope this helps...
Fred
Fred Hudspeth
1978 Royale (TZE 368V101335) - Tyler, TX
1982 Airstream Excella (motorhome) - Cooper Landing, Alaska
Message: 3
Date: Thu, 24 Aug 2017 07:52:50 -0600
From: Ken Burton
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Onan ignition questions
Message-ID:
Content-Type: text/plain; charset="utf-8"
Thanks Jim.
I removed the RFI capacitor yesterday. I just did not mention it in my
posting.
It looks like the first thing I need to do today is go after to go after the
capacitor across the points. Jim K. called me just before midnight. He
measured another coil that he had is stock and it came up at 38K. He also
told me that he has sold more than a few of these and never had anyone say
that they did not work. So I guess I need to put that resistance difference
aside and look elsewhere.
Both you and Jim K. have pretty much convinced me this new coil is not the
problem.
If I do not get anywhere with the capacitor, there is another used coil on a
Kohler engine that I'll look at "borrowing" to try. After that I'll
probably fly down to Blaine's and get the used Onan one that he has.
This bug is really exasperating.
Thanks again for the help.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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