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Old 09-28-2009, 08:35 AM   #15
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Generally it's the points. I find that my ignition points corrode over a very short time and need to be cleaned. That is the first thing I check now if the Onan won't start.

I generally use a light to see if the spark plugs are getting fire. If not, Points.
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Old 09-28-2009, 09:14 AM   #16
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Have any of you converted propane gensets to gasoline? I've been thinking about doing that to my onan because of difficulty getting propane on the road. My sob MH has a built in propane tank and it is almost impossible to keep propane in it when traveling. The propane station, if they have one, is usually on the wrong side of the rig, and when you are towing a car backing up is not an option. I ordered the proper gas carburator from onan and am about to give it a try. My rig is diesel but I have room to mount a gas tank near the generator. Any thoughts?
Don't..........
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Old 09-28-2009, 10:46 AM   #17
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Why........
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Old 09-28-2009, 11:30 AM   #18
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I thought I might get some helpful input from someone who may actually know something. I am leary of continueing this thread. Good luck Mr. Dobbin, I hope you get it running.
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Old 09-28-2009, 12:29 PM   #19
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Why........
I've got 1308 hours on my propane-powered Onan. In that time, I've replaced only points and the heavy cable from the starter battery. It gets Delo every 100 hours and air filter as needed. It runs clean and efficient. I see no reason other than your problem with finding propane to change it out to a inefficient and dirty way of powering the gen set, IMO.
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Old 09-28-2009, 01:21 PM   #20
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I'm not asking you to change yours. That has nothing to do with my needs. Thanks anyway.
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Old 09-28-2009, 01:51 PM   #21
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I'm not asking you to change yours. That has nothing to do with my needs. Thanks anyway.
Excuse me for posting, I thought you wanted advice.
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Old 11-25-2009, 09:32 PM   #22
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Paul,

Did you ever find the problem with the genset? I had the same problem on recent trip in the rain. Worked on Friday and on Saturday it cranked but would not start. After two warm dry days attempted to start on Sunday and it started right up. I suspect corrosion (or just moisture) in the points. Putting up for winter and will have tuned up in spring before going on the road.
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Old 11-27-2009, 06:53 PM   #23
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No, I haven't solved the problem yet. Probably have to wait until spring
now, as the Roahouse is in NC and I'm in Florida.
Thanks,
Paul
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Old 11-28-2009, 08:13 AM   #24
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I had the same problem with my new propane genset in 08. A friend took the air filter off and held his palm against the intake as he pressed the start button, fired right up.

If I am traveling and start the genset everyday , it starts with no problem from inside the MH. When it has not been started for a long while , I always have to start from outside and hold my hand on the air intake port. That has workrd for me every time so far.

I don't know if this will help you ,but you might give it a try. I do check the oil and change as recomended.

Kay
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Old 11-28-2009, 09:55 AM   #25
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Paul
Just a suggestion from one who deals with small engines. I however am not familiar with this engine. But I would (if you don't have one) go to Harbor Freight or an auto parts store and get a spark tester. Take off one plug wire and insert this between the plug and the sparkplug wire. Crank the engine and see if there is spark. If no spark, three things come to mind, points, condenser. coil. Change the points and condenser as a pair. The most common failure in this system is the condenser. Then if no change the next suspect is the coil. Try this first and report back. If you could give me the Onan model # Id be glad to look up what you might need and some pricing ranges.
Roger
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Old 11-28-2009, 10:35 AM   #26
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If its not the points Paul, check this. On the back side of the propane intake where you can't see it, (also known as a carb), there is a small screw, (purpose unknown), that on mine at one time had vibrated loose and allowed too much air into the intake. Tightened it up and it started right up.

I still suspect the points but another question is, do you have the Moho engine running when you try to start it. That helps as it causes it to turn over faster. As far a flooding, I don't think you can with propane.
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Old 02-03-2010, 09:15 PM   #27
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Propane issue

The ONAN propane generator uses a separate valve on the tank to feed liquid propane to the genset. First verify that the valve is open. ALL other gas appliances in the coach feed off of the OTHER VALVE.

As you look at the genset, the carb should be to the right of the unit. If you go all the way to the back and the lowest point on the "tray" that holds the generator, you can feel the flexible hose that comes from the tank. This flexible hose attaches to a metal device that has wires attached to it. This is the fuel solenoid that allows liquid gas to flow or not flow to the generator. If it is bad or not getting power you will not get gas. There is also a fuel filter screen contained in this assembly. Liquid gas then flows to an assembly on top of the genset that sits on the heads. This heats the liquid propane and forces it into a vapor.

If you smell propane when starting the unit, it is unlikely that the valve described above is bad. If you don't smell propane, your valve may be bad or filter blocked. Behind the manual switch on the set, there are a few fuses. Check these for continuity. If you have a bad oil level switch, the genset will also not fire. In your case, it will be very difficult to check for spark at the plug or coil because this is done from the top of the unit. I had to remove my set from the coach to do this.

If you can't get it running yourself, I have an ONAN Genuis that I ran up on who is all knowing and extremely reasonable that I can hook you up with in Atlanta near Kennesaw and I-75. He has a small barn full of parts on hand and is a very honest guy.

Ed
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Old 09-29-2010, 09:53 AM   #28
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Question onan

my ly onan only runs on liquid valve course my tanks have 2 valves liq./vapor can you smell overflow of propane? I would change spark plug 1st go from there
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