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Onan 7.5 JB's Recovery Towards A New Life


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  #31  
Old 01-15-2017, 05:47:24 PM
MBB MBB is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

Here is the parts list for your unit. See this thread post #9
www.smokstak.com/forum/showthread.php?t=144431
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  #32  
Old 01-15-2017, 06:49:22 PM
Leon N. Leon N. is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

Once it reaches about 2200 RPM, the over speed switch latches and grounds the ignition system. Only way to restart is to manually remove the ground by pulling the magnet of the grounding contact in the generator end bell housing.
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  #33  
Old 01-15-2017, 06:51:16 PM
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Default Re: My 7.5 JB's Recovery Towards A New Life

Really clean looking machine Johnnyc. Ya did good! It will serve you for many years.
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  #34  
Old 01-15-2017, 08:52:58 PM
Leon N. Leon N. is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

Looking at the model number of the specific JB in this thread it appears the Onan Corp got away from or deviated from the model identification which indicated special parts list for Pennsylvania approved plants. At least the specific PA parts were identified in the JB owners manual, 967-320, page 49-52 which was pertinent to the mid 1960's models.

Note, on this plant the oil drain pipe is excessively long and the rubber support cushions are missing.
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  #35  
Old 01-15-2017, 09:36:41 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 Leon N. View Post
Looking at the model number of the specific JB in this thread it appears the Onan Corp got away from or deviated from the model identification which indicated special parts list for Pennsylvania approved plants. At least the specific PA parts were identified in the JB owners manual, 967-320, page 49-52 which was pertinent to the mid 1960's models.

Note, on this plant the oil drain pipe is excessively long and the rubber support cushions are missing.
Hi Leon, I have the rubber vibration insulator feet. The JB is temporarily resting on the cart you see in the video and pictures. It will remain on the temporary cart until I am done servicing the JB which may include a complete tune up and possibly a complete paint job which means a tear down. Afterwards, it will be mounted on a custom made cart as I always did in the past. To many here, the exterior of JB looks good cosmetically, but it has its road rashes and chipped paint, but not too bad and can easily be put into service the way it is. Under the tins, it is like new. Since I have the tools and space to the job and make it look new, I may go that route. For now, I am spending time assessing the JB before I do anything else.

JohnnyC
New Jersey

---------- Post added at 08:36:41 PM ---------- Previous post was at 08:23:41 PM ----------

Quote:
Originally Posted by MBB View Post
To bad Johnny. It is however a simple retro fit. It uses the standard electronic ignition module and trigger used on all other models.
MBB, with the over speed cutoff, I don't think the module and ring will fit correctly. I am very familiar with how it all works and converted my 6.5NH points generator to the same type of electronic ignition from parts I salvaged from a T260G Onan motor. I rigged up a switch to flip back and forth between points and electronic ignition and works very well. I'd rather have electronic ignition that the over speed cutoff option....

Anyway, thanks for the information. Very interesting.

JohnnyC
New Jersey
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  #36  
Old 01-15-2017, 09:54:07 PM
JohnnyC JohnnyC is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

After my daytime therapy in the garage I promised more pictures (attached below) on my activities .
Picture #1) I removed the rat's nest of wires that were in the control box. Looks a lot cleaner now.The wires that were removed were used to connect the JB to the transfer switch. Since I have no interest in the transfer switch, why keep the wires? If I change my mind, I can easily rewire it. It is amazing those little rat/mice rodents never moved into the control box and I will eventually seal the gaps in the rectangular hole in the rear corner where they rodents enter.

Picture #2) Yellowlister asked me if I had a 12 wire reconnectable model. It is. Funny thing is in the picture I only count 11 lead wires, but trust me, there are 12. It is currently wired in a Parallel Wye configuration for 120/240 ac 3 phase. I will rewire it to a Double Delta configuration for 120/240 single phase.

Picture #3) Len asked how the meters were wired. Well here it is. If you look at the lower row of meters in the picture you will see black, red and blue wires by themselves on the meter terminal studs. These meters are the amp meters for each leg.

Picture #4) This shows the front of the meter panel. It is dirty from road salt from yesterday's journey from lower Pa to North NJ in a snow storm (yes, we had snow falling for the entire 130 mile trip back). The JB was covered on plastic, but the snow and salt only got the meter panel.

JohnnyC
New Jersey
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  #37  
Old 01-15-2017, 11:38:11 PM
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Default Re: My 7.5 JB's Recovery Towards A New Life

Surprised that the control for your set, being a PA. spec, doesn't have an enclosed run relay. The JB that I found a year ago from a California college has the 8 pin enclosed relay.
Johnny, What's with the BLUE, "Property of BMW N.A." part totes in your video?
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The Control panel
and gauges of my
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  #38  
Old 01-16-2017, 07:21:56 AM
JohnnyC JohnnyC is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

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Surprised that the control for your set, being a PA. spec, doesn't have an enclosed run relay. The JB that I found a year ago from a California college has the 8 pin enclosed relay.
Johnny, What's with the BLUE, "Property of BMW N.A." part totes in your video?
The blue parts totes are blue parts totes. I work for a large BMW dealership in the parts and service department. Once in a while I'll use my vehicle to transport parts and the totes come handy for small parts that otherwise would get lost in the back of the vehicle. These totes were removed from my vehicle to make room for the transfer switch from Saturday's journey to Pa. Today they go back.

JohnnyC
New Jersey
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  #39  
Old 01-16-2017, 10:14:36 AM
Jim Marcozzi Jim Marcozzi is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

Just a little FYI:
3 years ago, about 120 JBs were removed service from West Penn Power tower and other sites. They were "scrapped", but I know that bunch of them made it out of salvage. Many were tri-fueled, but ran strictly on propane. Most had the sealed "marine" regulator.
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Old 01-16-2017, 11:15:03 AM
Leon N. Leon N. is offline
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Default Re: My 7.5 JB's Recovery Towards A New Life

Jim, what is a sealed marine regulator?
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