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Re: [GMCnet] Bringing Onan back to life due to impending hurricane [message #185491 is a reply to message #185485]

Sun, 23 September 2012 15:55

mike miller

Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon

Karma:

Senior Member

The way I understand it: The points do not have the spring tension to keep the plunger from "binding" a little as it slides up and down. Unlike the valves and lifters, the points system isn't designed to have the pressure needed. the result is erratic timing. You can see this my watching the stock system with a timing light.

SO... any replacement system that uses the plunger will have erratic timing. This is the reason Onan had "de-tuned" the timing, running it more "retarded" than the "best" timing for performance and efficiency. A system triggering off of the flywheel by-passes the plunger, allowing much more aggressive timing... safely.

Robin, do NOT just buy new parts and throw it at the Onan. Jumping the board takes it out of the loop, so until you get it running with the board jumped... A NEW BOARD WILL NOT HELP.

Logical troubleshooting steps can be in a separate message.

James Hupy wrote on Sun, 23 September 2012 11:20

Robin, any replacement ignition system that goes in the original points box
and uses the phenolic resin points plunger to trigger it has the same
Achilles heel as the points do. Asthe engine runs, plunger wears shorter...

> CFO forbids spending money by taking it to the shop. "They're
> just going to throw new parts at it AND you'll still have to
> pay labor. Buy the parts yourself and we'll put them on
> together."
>
> I see Jim K. sells the Dinosaur brand Onan control board ...

> ...
> > Argh. How frustrating.

Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo' http://m000035.blogspot.com

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		[GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 12:06
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 12:28
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: ljdavick on Mon, 27 August 2012 12:58
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: lqqkatjon on Mon, 27 August 2012 13:00
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 13:07
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: mike miller on Mon, 27 August 2012 13:43
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: ljdavick on Mon, 27 August 2012 14:21
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: mickeysss on Mon, 27 August 2012 17:38
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 19:01
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 19:50
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: powerjon on Mon, 27 August 2012 20:07
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 20:15
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: powerjon on Mon, 27 August 2012 20:26
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 20:31
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: USAussie on Mon, 27 August 2012 21:43
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 21:58
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: sgltrac on Mon, 27 August 2012 22:12
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: powerjon on Mon, 27 August 2012 20:34
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: ljdavick on Mon, 27 August 2012 20:31
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: midlf on Mon, 27 August 2012 20:44
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Mon, 27 August 2012 21:47
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: ljdavick on Mon, 27 August 2012 23:59
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: ljdavick on Tue, 28 August 2012 00:20
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: sgltrac on Tue, 28 August 2012 00:35
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: k2gkk on Tue, 28 August 2012 08:10
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Tue, 28 August 2012 08:24
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: USAussie on Tue, 28 August 2012 11:16
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Tue, 28 August 2012 11:27
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: USAussie on Tue, 28 August 2012 11:32
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: mickeysss on Tue, 28 August 2012 13:10
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Tue, 28 August 2012 13:22
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: ljdavick on Tue, 28 August 2012 11:43
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: A Hamilto on Tue, 28 August 2012 11:51
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: hal kading on Tue, 28 August 2012 11:38
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: A Hamilto on Mon, 27 August 2012 22:28
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: sgltrac on Mon, 27 August 2012 22:37
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: A Hamilto on Mon, 27 August 2012 23:00
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: ljdavick on Mon, 27 August 2012 20:28
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: lqqkatjon on Mon, 27 August 2012 13:45
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: sgltrac on Mon, 27 August 2012 22:07
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: JohnL455 on Tue, 28 August 2012 15:01
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sat, 01 September 2012 07:58
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: USAussie on Sat, 01 September 2012 09:10
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: mike miller on Sat, 01 September 2012 19:26
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: USAussie on Sat, 01 September 2012 21:38
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sat, 01 September 2012 21:40
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Fri, 14 September 2012 10:21
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Ken Henderson on Fri, 14 September 2012 12:41
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sat, 22 September 2012 16:17
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: powerjon on Sat, 22 September 2012 16:32
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sat, 22 September 2012 17:18
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: James Hupy on Sat, 22 September 2012 17:20
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 23 September 2012 10:30
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: James Hupy on Sun, 23 September 2012 11:07
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 23 September 2012 11:11
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: James Hupy on Sun, 23 September 2012 13:20
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: mike miller on Sun, 23 September 2012 15:55
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 23 September 2012 17:45
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: James Hupy on Sun, 23 September 2012 18:04
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Ken Henderson on Sun, 23 September 2012 22:03
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: mike miller on Sun, 23 September 2012 22:11
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 14 October 2012 08:59
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Ken Henderson on Sun, 14 October 2012 09:12
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 14 October 2012 09:22
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Ken Henderson on Sun, 14 October 2012 10:29
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 14 October 2012 11:00
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 14 October 2012 14:24
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Ken Henderson on Sun, 14 October 2012 15:44
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 14 October 2012 21:16
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Robin Hood on Sun, 14 October 2012 09:15
		Re: [GMCnet] Bringing Onan back to life due to impending hurricane By: Ken Henderson on Sun, 14 October 2012 09:17

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