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Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

New Proud Owner of an Onan JC


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  #41  
Old 10-12-2017, 07:23:07 PM
JT240Z JT240Z is offline
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OK, I've got her home and have done an initial inspection. This is what I've found so far. The original air filter was completely shot. Luckily it looks like nobody had started it in a long time so no debris was in the carburetor throat:


I did have two mouse nests. One in the compartment that houses the start/stop switch and charge meter. The regulator board compartment shows no signs of intrusion or damage. The other mouse nest was inside the air compartment that covers the distributor, coil and carburetor. The one in the meter panel did no real damage. One wire had a little chew marks and about 1/2" of missing insulation but nothing serious. The wire is white and goes to the remote start terminal block. The other did a little more damage but still nothing too serious. The condenser on the coil was a little rusty and there was some rust on the bottom of the panel.:


Some debris was in the cooling fins but that was easily vacuumed out. None of the wires inside were damaged at all. I removed the distributor cap and everything inside was super clean. Even the points looked like new.


I checked the oil again and it was full and virtually clear. I even scraped the bottom of the oil pan with a long screwdriver and found no sludge deposit of any kind.:
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  #42  
Old 10-12-2017, 07:27:39 PM
JT240Z JT240Z is offline
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I also pulled the cover to the 12 T wires and found them all in excellent shape and connected to what looked like 12/208 3 phase. That will have to change to 120/240 single phase but that should be no big deal as long as the wires are marked T1-T12. Crossing my fingers there.
There is one mystery hose that connected to the carburetor but no connection on the other side. If someone could tell me what this is and where the other end goes please:


I cleaned her up a little and this is what I have now:




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  #43  
Old 10-12-2017, 07:33:11 PM
JT240Z JT240Z is offline
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Here are some more pics:


It was a little hard putting her on the trailer but I did manage to do it by myself.:




This is the serial and model number of the transfer switch that came with it:


If anyone has documentation on this switch it would be greatly appreciated.
Well, that all for now. Next step is to prepare her for initial startup. Obviously a new air filter is in order.
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  #44  
Old 10-12-2017, 07:41:26 PM
Charley K Charley K is offline
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Default Re: New proud owner of a JC

LOL ( the condenser was a LITTLE BIT RUSTY). Just funning you, A very nice machine. I've been looking.....
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Old 10-12-2017, 08:12:42 PM
reid070 reid070 is offline
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Default Re: New proud owner of a JC

There is one mystery hose that connected to the carburetor but no connection on the other side. If someone could tell me what this is and where the other end goes please:


That is the hose that would go to the crankcase breather. However according to the manual after spec t uses a pvc valve under the rocker box cover. So why you have it is a puzzle. Perhaps some parts swapping has gone on here. She looks in great shape ,you'll get it running great in no time I bet

Steve
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Old 10-12-2017, 08:39:41 PM
nothingbutdarts nothingbutdarts is offline
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Default Re: New proud owner of a JC

Nice find! You might want to pull the cover off the Gen. end and checl for mice damage as well unless you already did that. They seem to like it in there as well.
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Old 10-12-2017, 09:15:56 PM
JohnnyC JohnnyC is online now
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Default Re: New proud owner of a JC

I am familiar with your transfer switch. I have the 30 amp version. I got the factory manuals, wiring diagrams and all here, but not in electronic format. Can you snap a picture of the inside showing the PC board where all the relays are located? The ATS will work with either 1 or 3 phase gensets and to configure it for 1 or 3 phase is super simple.

Also, I will bet you a beer that you missed one mouse condo, especially if they were in the control box and the other area you mentioned..
(Hint: See picture below)

JohnnyC
New Jersey
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  #48  
Old 10-12-2017, 10:03:24 PM
JT240Z JT240Z is offline
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Default Re: New proud owner of a JC

Quote:
Originally Posted by nothingbutdarts View Post
Nice find! You might want to pull the cover off the Gen. end and checl for mice damage as well unless you already did that. They seem to like it in there as well.
Checked that out as well but the inside of the generator was completely clean. No sign of debris and no unusual smells.
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  #49  
Old 10-12-2017, 10:11:32 PM
JohnnyC JohnnyC is online now
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Default Re: New proud owner of a JC

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Originally Posted by JT240Z View Post
Checked that out as well but the inside of the generator was completely clean. No sign of debris and no unusual smells.
I lost and I owe you a beer. What do you like and where do I send it? You can PM me if you want. Seriously.... Anyway that is good news for you.

JohnnyC
New Jersey
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  #50  
Old 10-12-2017, 10:17:36 PM
JT240Z JT240Z is offline
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Default Re: New proud owner of a JC

Quote:
Originally Posted by JohnnyC View Post
I am familiar with your transfer switch. I have the 30 amp version. I got the factory manuals, wiring diagrams and all here, but not in electronic format. Can you snap a picture of the inside showing the PC board where all the relays are located? The ATS will work with either 1 or 3 phase gensets and to configure it for 1 or 3 phase is super simple.

Also, I will bet you a beer that you missed one mouse condo, especially if they were in the control box and the other area you mentioned..
(Hint: See picture below)

JohnnyC
New Jersey
Didn't remove that cover yet but I did look at it from every opening. Good suggestion to remove and inspect it though. It will be on the list of things to do.

I did remove the generator cover and turned her over using the large nut on the end. Turned it clockwise and felt and heard nothing strange. I could feel all four compression cycles for the four cylinders and each felt pretty much the same.

Suggestions on how to do an initial start? It will take me a while to get her in a position where I can feed her NG. The only propane I have on hand is a few 20lb bottles. Can I just feed it with propane from a 2 stage regulator? I have one that can supply 165k BTU at 11 WC that I used to feed a 6.5K NHM genset. I'm not talking about load testing it. Just getting her started and verifying she produces power.

Quote:
Originally Posted by JohnnyC View Post
I lost and I owe you a beer. What do you like and where do I send it? You can PM me if you want. Seriously.... Anyway that is good news for you.

JohnnyC
New Jersey
Technically you didn't loose because I haven't completely removed that cover yet. If you're ever in my area we can share some beers.
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