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Onan Update [message #244796]

Sun, 23 March 2014 20:23

Steve

Messages: 506
Registered: September 2013
Location: East Greenville, Pa

Karma:

Senior Member

I finally had a day off where I could spend some additional time on the Onan. Thanks to many here on the net I was able to get it started and running last fall but I was still having a number of issues. I am posting my issues and their resolution only so others may benefit from them.

1. I had a very difficult time getting spark. I had tried everything I have know from working on engines my whole life. It turned out to be pretty simple. It was not getting spark because the Low Oil Pressure (LOP) circuit was preventing spark. In order to override the LOP circuit you simply disconnect the number 12 wire from the circuit board. Although great for troubleshooting and emergency operation, it is not a good idea to run on a regular basis without the protection the LOP circuit provides. Yesterday I changed the oil, oil filter, and the oil pressure sending unit (AutoZone in stock), which is located behind the cover on the right side of the unit, near the oil filter. Once the new sending unit was installed I was able to start the Onan and reconnect the number 12 wire and it is now operating correctly.

2. My starter motor would not disengage once the engine started. It would stay in contact with the flywheel. I would either have to shut it down, or pull the positive wire off the starter solenoid (mounted on the stater). While working on the LOP circuit I noticed a very lose connection on the solenoid (mounted under the circuit board). This was one of the small wire connections that had come lose. The nut and lock washer had come completely off. Once replaced and tightened down I have not experienced the starter disengage issue. I don't know for sure if this was the specific problem but they seem to be related.

3. I was never able to control the Onan from the remote panel inside the coach. Although these controls are just a simple switch and hour meter on my 78 Royle, they were not functioning. With the Onan now running really smooth and with new oil and filter I decided to trace the remote wiring. Sure enough, I was able to locate a break in both the red and blue wires. With a simple splice of these two wires I now have a fully functioning Onan with remote control!

I could not have gotten this far with Onan without the help and resources here on the forum. I am getting better at searching both the forum and the GMC photo page. I also go to bdub.net and follow the link to Gene Fisher's web site where there is a wealth of information on nearly every topic. Many thanks to Bdub, Gene and others for making this information available.

Please remember to contribute $$ to keep the forum and photo site going.

Now that the Onan is operating correctly and has fresh oil and filter I will do some longer test runs under load. My ultimate goal is to do the electronic ignition conversion which has been well documented on the photo site.

As soon as the weather warms up a little, the next system to test and troubleshoot will be the plumbing system and hot water heater.

1978 GMC Royal
Eastern Pennslyvania
1968 Chevrolet C20 396 Camper Special
1969 Chevrolet C20 Camper Special
1985 Buick Electra Park Avenue
1992 Camaro 25th Anniversary Heretage Edition Black

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[Message index]

		Onan Update By: Steve on Sun, 23 March 2014 20:23
		Re: Onan Update By: Don A on Sun, 23 March 2014 20:32
		Re: [GMCnet] Onan Update By: Mr ERFisher on Mon, 24 March 2014 03:59
		Re: [GMCnet] Onan Update By: Carl S. on Mon, 24 March 2014 13:35
		Re: [GMCnet] Onan Update By: Ken Henderson on Mon, 24 March 2014 22:23
		Re: [GMCnet] Onan Update By: Bob de Kruyff on Mon, 24 March 2014 23:05
		Re: [GMCnet] Onan Update By: Mr ERFisher on Tue, 25 March 2014 04:19
		Re: [GMCnet] Onan Update By: emerystora on Tue, 25 March 2014 07:17
		Re: [GMCnet] Onan Update By: mickeysss on Tue, 25 March 2014 08:26
		Re: [GMCnet] Onan Update By: Mr ERFisher on Tue, 25 March 2014 08:52
		Re: [GMCnet] Onan Update By: Ken Henderson on Tue, 25 March 2014 21:01
		Re: [GMCnet] Onan Update By: Jim Miller on Wed, 26 March 2014 08:36
		Re: [GMCnet] Onan Update By: mickeysss on Wed, 26 March 2014 08:55
		Re: [GMCnet] Onan Update By: Ken Burton on Wed, 26 March 2014 10:45
		Re: [GMCnet] Onan Update By: Matt Colie on Wed, 26 March 2014 19:46
		Re: [GMCnet] Onan Update By: Bob de Kruyff on Wed, 26 March 2014 21:24
		Re: [GMCnet] Onan Update By: USAussie on Wed, 26 March 2014 22:29
		Re: [GMCnet] Onan Update By: powwerjon on Thu, 27 March 2014 10:33
		Re: [GMCnet] Onan Update By: mickeysss on Thu, 27 March 2014 21:06
		Re: [GMCnet] Onan Update By: rjw on Thu, 27 March 2014 11:47
		Re: [GMCnet] Onan Update By: Jerry Wheeler on Thu, 27 March 2014 13:24
		Re: [GMCnet] Onan Update By: stick miller on Thu, 27 March 2014 13:33
		Re: [GMCnet] Onan Update By: Bob de Kruyff on Thu, 27 March 2014 20:18
		[GMCnet] GMCMI Conventions (was: Onan Update) By: Billy Massey on Thu, 27 March 2014 13:36
		Re: [GMCnet] GMCMI Conventions (was: Onan Update) By: Kingsley Coach on Thu, 27 March 2014 13:59
		Re: [GMCnet] GMCMI Conventions (was: Onan Update) By: Billy Massey on Thu, 27 March 2014 14:14
		Re: [GMCnet] GMCMI Conventions (was: Onan Update) By: Byron Songer on Thu, 27 March 2014 17:35
		Re: [GMCnet] GMCMI Conventions (was: Onan Update) By: Joe Weir on Thu, 27 March 2014 22:11
		Re: [GMCnet] GMCMI Conventions (was: Onan Update) By: Joe Weir on Thu, 27 March 2014 22:17
		Re: [GMCnet] GMCMI Conventions (was: Onan Update) By: Bob de Kruyff on Thu, 27 March 2014 22:58
		Re: [GMCnet] GMCMI Conventions By: BobDunahugh on Thu, 27 March 2014 17:23
		Re: [GMCnet] GMCMI Conventions (was: Onan Update) By: Bob de Kruyff on Thu, 27 March 2014 20:20
		Re: [GMCnet] Onan Update By: Carl S. on Thu, 27 March 2014 17:24
		Re: [GMCnet] Onan Update By: jhbridges on Fri, 28 March 2014 11:53
		Re: [GMCnet] Onan Update By: USAussie on Fri, 28 March 2014 18:50
		Re: [GMCnet] Onan Update By: jhbridges on Fri, 28 March 2014 20:15
		Re: Onan Update By: Ultravan Owners on Thu, 27 March 2014 11:33
		Re: [GMCnet] Onan Update By: Mr ERFisher on Sun, 23 March 2014 20:35
		Re: Onan Update By: SeanKidd on Mon, 24 March 2014 14:52
		Re: Onan Update By: Steve on Mon, 24 March 2014 19:12
		Re: Onan Update By: Ken Burton on Mon, 24 March 2014 23:52
		Re: Onan Update By: SeanKidd on Tue, 25 March 2014 06:14
		Re: Onan Update By: WildBill on Wed, 26 March 2014 22:47

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