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Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

What Have You Done to Your Onan Generator Today?


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  #3041  
Old 04-11-2017, 01:09:12 AM
len k len k is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Yes I know I must pray to the Onan gods for forgiveness , but I couldn't resist myself. It was free, only 12 miles from me. ALUMINUM Pushrod broke in 1/2 , and dead oil pressure sensor.

It didn't deserve a new pushrod , so I gave it what it needed. I took a rusty steel plant rod out of the garden and made it into a pushrod. Runs fine now.
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  #3042  
Old 04-11-2017, 01:55:07 AM
Vanman Vanman is offline
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Default Re: What Have You Done to Your Onan Generator Today?

That's funny!!

Evidently there was enough margin in the valve spring to control the valve train with the presumably heavier steel pushrod....
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  #3043  
Old 04-11-2017, 11:19:52 AM
len k len k is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Wanted to see if made AC before I put money into it. Engine does make a racket, like it's ready to self destruct. Suspect an aluminum rod would not cure it, but when I get a chance I suppose I could grab an aluminum plant stak out of the garden and try it.

Steel is 3X density of aluminum. Was meaning to calculate if inertial force of steel rod was significant relative to ~ 25 ?? pound valve spring force, but didn't get around to it. Extra mass also would bring down the resonant natural frequency of spring and rod (mass) system a bit, could oscillate if comes down to engine freq.

Even though I don't like the idea of a aluminum pushrod, the real problem was a crummy design. They used a sharp edged heavy sheet metal rod "guide" that was only held in place by ONE bolt. It rotated and dragged on the rod till it finally wore, grabbed and snapped. The "guide's" only purpose was to make it easier to install the "rocker arms".

Last edited by len k; 04-11-2017 at 02:28:08 PM.
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  #3044  
Old 04-11-2017, 02:45:37 PM
sbbloom69 sbbloom69 is offline
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Default Re: What Have You Done to Your Onan Generator Today?

I got a 1999/2000 Generac for almost free (I donated $20 to the local Ham radio club to get it out of the basement). Labeled as a Sears Craftsman, 4.2 kW, 240 / 120 and 12VDC, pull or electric start. All I had to do was flush the tank and clean the carb. Runs great.

BUT, it runs at 3600 rpm and is NOISY. I just love the 1800 RPM Onan's. With the decent muffler I have on it, its is smooth and quiet.

Stu
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  #3045  
Old 04-11-2017, 04:47:03 PM
I like oldstuff I like oldstuff is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Crappy weather yesterday so I fired up the 15kW Kohler and tossed the load bank on it for an hour. Maybe I'll paint it Onan green so I don't feel so guilty posting in this thread.
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  #3046  
Old 04-12-2017, 05:17:35 PM
TLB01 TLB01 is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Small victory today. FU, resonator. Yes, its not a DKD Donaldson style air filter but it should be just fine.
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  #3047  
Old 04-20-2017, 09:26:08 AM
Max Thompson Max Thompson is offline
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Default Re: What Have You Done to Your Onan Generator Today?

"What my help did to my Onan today"

I walked by the housed JC that I restored, including a meticulous paint job a few years ago and found a 2" pipe die laying on top of the hood with oil running across the beautiful Onan green paint.

Needless to say, the quiet of the early morning shop was broken. His comment was "I don't think I slid it".

I do not think it will happen again.
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  #3048  
Old 04-21-2017, 05:30:24 AM
Handyhiker1 Handyhiker1 is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Quote:
Originally Posted by TLB01 View Post
Small victory today. FU, resonator. Yes, its not a DKD Donaldson style air filter but it should be just fine.
I have a similar set up on my 5.0cck. Got the filter on sale for $13 and it fits great.
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  #3049  
Old 04-22-2017, 03:42:16 PM
Wayne 440 Wayne 440 is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Cranked up the 15RDJC for Earth Day. My own brand of (Onan) "green" electricity.
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  #3050  
Old 04-22-2017, 07:27:00 PM
yellowlister yellowlister is online now
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Default Re: What Have You Done to Your Onan Generator Today?

Jc disassembly... stator and rotor came off pretty easy.. dident get to use my new sledge hammer... yet
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  #3051  
Old 04-22-2017, 08:01:53 PM
mheltunen mheltunen is offline
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Default Re: What Have You Done to Your Onan Generator Today?

I see my isolators!
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  #3052  
Old 04-25-2017, 09:58:01 AM
Kevin K Kevin K is offline
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Default Re: What Have You Done to Your Onan Generator Today?

I found an NH. I've been looking for a few years, but because I didn't really "need" one, I waited until I found something in reasonable condition, at a reasonable price, and most important not another Northeast rust bucket.

The PO never used it but purchased it from someone else who used it in a race car trailer and decided he wanted a portable. The seller didn't demonstrate it running (and I paid accordingly) but said he had it running, the engine ran well, although the output voltage was too high. The engine turns over freely by hand, has compression, and the oil looks good so I went for it.

The fuel pump has been replaced. The electric choke is disconnected and the piece of ceramic holding the power connection has broken, but the heater element is intact and I should be able to patch it. The original owner has given us a demonstration of what he learned in "Creative Wiring 101" class with the relay control system disconnected, a push to start switch added, and an ON/OFF switch that feeds power directly to the coil. This appears to be an "AUX" model with a stator coil behind the flywheel and a voltage regulator that provides a 30 amp 12 volt output.

So we will see what happens. Given what I was told about the output voltage, I think I will clean the carburetor before I even try to start it. Most likely it was surging at idle due to clogged carburetor passages, so the backyard mechanic increased the idle speed until it stopped surging but now the voltage is way too high.
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  #3053  
Old 04-25-2017, 10:03:12 AM
nothingbutdarts nothingbutdarts is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Nice! I wish the ones I buy had a muffler like that. Hope it's a good runner for you.
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  #3054  
Old 04-25-2017, 11:18:32 AM
geezer88 geezer88 is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Speaking of mufflers, what is up with that one? It appears to have an air cooled jacket around it? Since it is a vacuflo unit, it would be sucking on the third pipe that ends in the shroud. Is that to reduce the muffler temperature to allow installation in a smaller space? Inquiring mind hasn't a clue.
tom
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  #3055  
Old 04-25-2017, 12:44:01 PM
len k len k is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Yes what's with the 3-rd pipe? Looks like an intake manifold pipe, but rust near muffler implies it gets pretty hot. Strange that they would let intake preheat that hot.
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  #3056  
Old 04-25-2017, 01:00:06 PM
Leon N. Leon N. is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Would be interesting to see the Onan factory build sheet for that unit. That may give a clue about the unusual muffler. Yes/No?
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  #3057  
Old 04-25-2017, 01:10:02 PM
nothingbutdarts nothingbutdarts is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Have seen a few of these posted on this sight before, I believe it's supposed to run cooler than a regular muffler.
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  #3058  
Old 04-25-2017, 01:18:28 PM
Kevin K Kevin K is offline
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Default Re: What Have You Done to Your Onan Generator Today?

I'm not sure exactly what the muffler is, I have never seen one like that before. I'm going to assume it pulls cool air in through the small holes and exhausts it through the VacuFlow system, keeping the surface cooler. I will know more when I get a chance to play with it. The other interesting feature is the 12 volt 30 amp power supplied by a stator behind the flywheel and a voltage regulator mounted on the generator band.


In the meantime, here is the build sheet.
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  #3059  
Old 04-25-2017, 02:14:02 PM
nothingbutdarts nothingbutdarts is offline
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Default Re: What Have You Done to Your Onan Generator Today?

look here:

http://www.ebay.com.au/itm/155-1905-...-/310409437765
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  #3060  
Old 04-25-2017, 02:15:24 PM
yellowlister yellowlister is online now
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Default Re: What Have You Done to Your Onan Generator Today?

It is to keep it cool inside a compartment.. I remember some time ago it was discussed.. nice score.. to bad they hacked up the wiring
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