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Onan 7.5 JB's Recovery Towards A New Life


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  #1  
Old 01-14-2017, 09:23:21 PM
JohnnyC JohnnyC is offline
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Default Onan 7.5 JB's Recovery Towards A New Life

My 7.5 JB's Recovery Towards A New Life.

I just hauled home from the State of Pennsylvania a 7.5 JB FL made in early April 1991 (see second picture) with only 216 hours on the hour meter along with an LT II transfer switch and ALL documentation (see 3rd picture below).

The JB has some desirable options such as the B150 special 3 phase "YD" extended stack that will deliver full output on both 1 and 3 phase as well as the C1 option which is factory tri-fuel. Other options are low oil pressure and the overspeed cut-off options, and the oil base for an optional heater. An additional accessory that this JB has is a full AC instrument meter panel. (see first picture below for the list of options).

I have no clue were this JB lived its life when it rolled out of the Onan factory, but it must have been installed in a commercial environment of some kind. In the documentation is paper work for engineering approvals and a copy of a certificate from the State of Pennsylvania.

As usual and like my other threads of other genset refurbishments this thread will most likely run 25 to 30 pages and many months as I progress through the JB's recovery to a new life by posting updates, tons of pictures, and asking questions. My goal is to get the JB running and looking like new and make it a functional part of my needs at my property so it will be ready when the lights go out.

For openers to this thread I posted 4 pictures below and were explained above. I have many pictures to post later on the JB's current condition and I'll throw in some pictures of the transfer switch although I have no plans to use it. The switch is in new condition and has some really neat parts inside of it that I may play with as time permits.

JohnnyC
New Jersey
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Old 01-14-2017, 09:34:15 PM
Ben Clarke Ben Clarke is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

I believe Pennsylvania had special specs for generators not sure what they where or if yours has them (option C1?) Maybe others can chime in.
great find you are the custodian of a set that will out last you and yours.
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Old 01-14-2017, 09:39:05 PM
JohnnyC JohnnyC is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

Quote:
Originally Posted by Ben Clarke View Post
I believe Pennsylvania had special specs for generators not sure what they where or if yours has them (option C1?) Maybe others can chime in.
great find you are the custodian of a set that will out last you and yours.
The C1 option is for a combination carburetor otherwise known as a tri-fuel carburetor ( gasoline, propane, and natural gas). You raise a good question!!! What are the differences between the special Pennsylvania gennys and non-Pennsylvania gennys? This JB was purchased from Keystone Onan Power Inc, Harrisburg, Pa according to my documentation. I am not sure if this certificate means anything regarding the JB or its installation (see picture below).

JohnnyC
New Jersey
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Old 01-14-2017, 09:46:16 PM
len k len k is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

I remember people saying state of Pennsylvania had special fire protection code requirements. No sparking. Relays were enclosed type, covers over brushes. Maybe they were worried about flour and coal dust.

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Originally Posted by JohnnyC View Post
......This JB was purchased from Keystone Onan Power Inc, Harrisburg, Pa according to my documentation.......
Owwwww...........Harrisburg.... Did you bring your Geiger counter?
Three Mile Island.

Last edited by len k; 01-14-2017 at 10:01:19 PM.
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Old 01-14-2017, 09:55:12 PM
Vanman Vanman is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

Wow, that thing sure looks like a beauty. I'd bet the most time you'll spend on this project is building a cart and maybe a meter box. The generator looks like it just needs an oil change a bath lol.
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Old 01-14-2017, 10:06:36 PM
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Jim McIntyre Jim McIntyre is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

Huh. That's the exact same spec number as the 'Toledo' sets that some of us snapped up a few years back. Mine is also 16581D, but is a 1993 model...

Does yours, by chance, have electronic ignition? (All the Toledo sets did, though I don't think they were shipped that way from Onan)

I do not think these are Pennsylvania variants.


Last edited by Jim McIntyre; 01-14-2017 at 10:38:14 PM.
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Old 01-14-2017, 10:50:18 PM
JohnnyC JohnnyC is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

Quote:
Originally Posted by Jim McIntyre View Post
Huh. That's the exact same spec number as the 'Toledo' sets that some of us snapped up a few years back. Mine is also 16581D, but is a 1993 model...

Does yours, by chance, have electronic ignition? (All the Toledo sets did, though I don't think they were shipped that way from Onan)

I do not think these are Pennsylvania variants.

Jim, this set has points. I would like to know more about the Onan OEM electronic ignition. Is there a thread that fully explains it that you can point me to????

Len, I remember reading the Pa sets had sealed relays, but I checked the control box and the relay is the standard open relay. Unrelated but for the heck of it I snapped a picture of the regulator board and it appears to be the "potted" board and unlike the regulator board in my ex-15.0 JC. Any pros and/or cons with the potted regulator board? (see pictures below)

JohnnyC
New Jersey
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Old 01-14-2017, 10:58:03 PM
YellowLister YellowLister is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

Your board is just very hard or impossible to repair compared to the open type... but are supposed to be more robust and handle time moisture and vibration better being there sealed.

Very cool you got all the paper work with it. Can't wait to see it all dolled up
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Old 01-14-2017, 11:01:38 PM
JohnnyC JohnnyC is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

Quote:
Originally Posted by Vanman View Post
Wow, that thing sure looks like a beauty. I'd bet the most time you'll spend on this project is building a cart and maybe a meter box. The generator looks like it just needs an oil change a bath lol.
It needs paint. The interior is excellent as you can see in the pictures from inside the control box that I previously posted.
Attached below is a snap shot showing the inside of the set with the front tin removed. It just needs a little dusting. The second picture shows mostly the exterior with some of the tins removed. I was working on fixing the no-start problem which was very simple to resolve and just require cleaning the points contacts with #400. You will notice the exterior is dirty and shows scratches here and there. I most likely will repaint it, but the ONLY thing that will change my mind is the possibility of losing all the nice silkscreen labeling. Maybe I will only repaint parts of the exterior and blend it into the silkscreen labels as I did in the past when I repainted my low hour 5.0CCK.

Tomorrow I will make a better assessment on the condition of the exterior since my main focus for today was driving a 260 mile round trip to pick up the JB and getting it to run. Today's mission was accomplished.

JohnnyC
New Jersey
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Old 01-14-2017, 11:01:47 PM
David C David C is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

I also have the same spec, except it is 1994 model. It has the same options but the tag only shows it is good for 5kw on single phase, which was discussed about a year ago. As others mentioned, it looks like it only needs a bath and a cart built.

David C.
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