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Onan Generators Restoring, operating and maintaining vintage Onan generators.

Onan Generators

Onan 7.5 JB's Recovery Towards A New Life


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  #581  
Old 04-15-2017, 09:58:00 PM
JohnnyC JohnnyC is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Saturday Evening Update
I got back from the house warming party at 7-ish. My garage tenant bought a fixer-upper and will be busy for the next 2 years. By the way, my garage tenant does not live in my garage, but rents out one of my garages for his muscle car.

Getting back on track - I worked my azz from the time I got home until 9-ish p.m. and got 98% of the paint off of the JB's body (motor and gen head). Another hour of hitting small spots and it will be ready for paint (see pictures below).

As for Sunday, it will be 100% garage time all day long!!!! I plan to start the morning off by drinking at least one pot of coffee and start installing the head on the JB followed by adjusting the valves. Afterwards I plan to further prep the main body of the JB for paint.

If I had a productive JB garage day today, I could have painted the main body of the JB on Sunday, but that ain't going to happen.

By the way, what looks like brown rust in the pictures below is NOT rust. It is actually the original brown/red primer.

JohnnyC
New Jersey
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  #582  
Old 04-15-2017, 10:22:04 PM
len k len k is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Would be interesting to see your techniques in a time lapse video of cleaning the block next time you do one.
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  #583  
Old 04-15-2017, 10:35:30 PM
JohnnyC JohnnyC is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Quote:
Originally Posted by len k View Post
Would be interesting to see your techniques in a time lapse video of cleaning the block next time you do one.
Sorry, the best I can do is a before and after picture as seen below.

JohnnyC
New Jersey
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  #584  
Old 04-16-2017, 09:26:22 AM
JohnnyC JohnnyC is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Last night I had a good laugh. As I was cleaning up in my garage after paint removal on my JB, one of my tenants came to visit to say hello and Happy Easter . He has seen all of my previous Onan restorations and was in one of my JC videos several years agof, but knows nothing about them.

As we were talking about non-Onan things he looks over and sees the JB. Since he really never seen this JB, he asks me if I just got it. I replied several months ago. He asks if I found it in the garbage .......... I will ask my tenant to hold the big black and white wires by the bare ends once I get it running

JohnnyC
NewJersey
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  #585  
Old 04-16-2017, 11:33:24 AM
JohnnyC JohnnyC is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Sunday Morning Update

Excellent morning - No one to bother me as I really need my Onan therapy today.

This morning I installed the head and taking a break (remember, I am milking this project until 2025). The pictures below show the fun.

This afternoon I will install the rockers and adjust them.

Time to brew another pot of coffee.

JohnnyC
New Jersey
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  #586  
Old 04-16-2017, 11:52:12 AM
Handyhiker1 Handyhiker1 is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Wish I had the time and patience to do that. I am lucky just to get them running and working right.
We will see, I would really like to do this to my 5.0cck now that I have all but the vacuum booster for it. It really runs nice and it has only taken 6 years. :

NICE work by the way!!
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  #587  
Old 04-16-2017, 11:55:34 AM
JohnnyC JohnnyC is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Thanks... I think the JB project will take more than 6 years to complete. so don't fell too bad

JohnnyC
New Jersey
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  #588  
Old 04-16-2017, 12:58:43 PM
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Motorhead Motorhead is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Just looked at the bottle of brake grease you put on internal head bolts. "Contains CERAMIC SOLIDS" Not real good stuff to use for insert bearings, cylinders and pistons with it flowing in the oil. You might want to rethink using that stuff.
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  #589  
Old 04-16-2017, 01:15:07 PM
len k len k is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

The grit on sandpaper is a ceramic solid.
Makes a GREAT sharp abrasive.

I'ld wash it off. Could eventually seize the bolt in the hole too.
Extra friction could screw up the bolt torque too, making clamping force low.
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  #590  
Old 04-16-2017, 01:19:37 PM
JohnnyC JohnnyC is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Good point! Time to redo. thanks,

JohnnyC
New Jersey
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  #591  
Old 04-16-2017, 04:47:43 PM
JohnnyC JohnnyC is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Sunday Afternoon Update

Beautiful Spring day in North Jersey today. This afternoon I took care the concerns from this morning and finished up by installing the rocker arm assemblies and adjusted the valves. As per the manual, combination gas (tri-fuel) JB intake valves must be adjusted to .013 and exhaust .020. All done and I slapped on the valve cover. All I need to do is tape up various things on the JB's body and it is ready to paint. I could have did everything today, but I chose to move at -10 mph and enjoy the great weather, however I got all done that I planned for today's goal.

Time for Easter dinner now...

JohnnyC
New Jersey
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  #592  
Old 04-16-2017, 08:22:05 PM
mheltunen mheltunen is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

That is one impressively clean looking JB. The finished product will look better than new. Nice work!
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  #593  
Old 04-20-2017, 08:04:59 PM
JohnnyC JohnnyC is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Thursday's Evening Onan Therapy Session Update

I had a productive therapy session this evening by setting up for the big paint job of the main body of the JB. I cleaned the painting area and prepped the JB for painting by doing some final paint removal (you will see red primmer in some areas and that's OK) and taping up things that should not be painted. The body has been entirely wiped down of any contaminates that can cause paint problems such as oils from the skin and whatever else that should not be there.

The plan:
I need to buy more paint. Most likely I have just enough paint, but if I run short during a painting session, that will suck. It would be worse than running out of welding gas or mig wire during a welding job (that has happened to me several times already).

Since all is setup, but I have to work on Friday, I plan to shoot the JB early Saturday morning after waking up and drinking at least a pot or 2 of freshly brewed coffee buying a more paint. If all goes to plan, the naked JB will sport a nice Onan green coat of paint over high quality epoxy primer by noontime. Once the cures, I will start to reassemble all the bolt on parts and work on the control box, but time will be short since I have to do a full brake job on my beater vehicle either late Saturday or Sunday.

JohnnyC
New Jersey
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Old 04-20-2017, 09:09:37 PM
Ben Cowan Ben Cowan is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

come on a full brake job after two pots of coffee should be done in 4 hrs!
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Old 04-21-2017, 07:31:25 AM
PopsGarage PopsGarage is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Lookin good Johnny..

Bob
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Old 04-21-2017, 12:42:48 PM
len k len k is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Got to admit, you do great prep work for painting, looks professional.

Quote:
Originally Posted by Ben Cowan View Post
come on a full brake job after two pots of coffee should be done in 4 hrs!
Or 3 minutes
But who's going to be the test pilot for the first ride?
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Old 04-22-2017, 07:31:24 AM
JohnnyC JohnnyC is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Saturday 7:30 am Update:

I am getting ready to go out and shoot my JB (prime and paint the main body) as planned. I am just finishing my first pot of coffee.

I bought a quart of Onan green paint yesterday to ensure that I have enough paint to finish the job as explained in my last post. The bad thing about having a whole quart of paint left over is I'll have to buy another Onan to use it on. I am looking for a 7.5 DKD to use it on......

Hopefully in the next 1.5 hours the JB will have a nice coating of Cromax epoxy primer as the first step in the paint job. After it sets up (1 to 2 hours) I will shoot the JB in pink,,,,, I mean Onan green.

JohnnyC
New Jersey
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Old 04-22-2017, 08:58:55 AM
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

9:00 am update

Epoxy primer is done as seen in the pictures below. I also shot several small parts off of the main body in my workshop and not pictured below. Now I sleep for 2 hours then get ready for the pink top coat.

JohnnyC
New Jersey
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Old 04-22-2017, 10:17:06 AM
Leon N. Leon N. is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

You seem to have a thing about stripping and re painting. That is fine, and the end result looks very nice. But, I'll bet the machine will stink to high heaven under the first full load as some of this paint burns off. Did you notice that when you refurbished your JC?

I got an idea. When you get down with the JB why not donate it to an Onan museum if one exists? You could start one? In any event I would like to get a full color picture of the finished product - only if done in the original Onan green. Nice work. But hey please do not drive an Onan machine to destruction, let alone yourself. Have another cup of coffee and relax.
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Old 04-22-2017, 10:51:23 AM
JohnnyC JohnnyC is offline
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Default Re: Onan 7.5 JB's Recovery Towards A New Life

Quote:
Originally Posted by Leon N. View Post
You seem to have a thing about stripping and re painting. That is fine, and the end result looks very nice. But, I'll bet the machine will stink to high heaven under the first full load as some of this paint burns off. Did you notice that when you refurbished your JC?

I got an idea. When you get down with the JB why not donate it to an Onan museum if one exists? You could start one? In any event I would like to get a full color picture of the finished product - only if done in the original Onan green. Nice work. But hey please do not drive an Onan machine to destruction, let alone yourself. Have another cup of coffee and relax.
Hi Leon...

I strip the old paint because it was applied very thick in the factory which makes the paint easily to chip. Add a new coat of paint on old thick paint and it may chip easier. Also, the original paint is not a very good quality paint by today's standards. Lastly, scratches in thick paint will show if new paint is applied without feather edging the old paint first. To sum it up, it is easier to blow off all the old paint and start from the beginning.

As for paint burning off, I never had paint burn off of the cylinder fins (I apply it by dusting keeping the paint thin) and it never smelled under load. From what I've seen, Onans have great cooling air flow and the only really hot area is near the exhaust manifolds which is normal.

As for Onan museum, my Onans are not a good example of a factory fresh Onan. What I mean is from the Onans I worked on, it appears the parts are mostly assembled in the factory then top coated in Onan green leaving lots of areas in primer that are not viewable by eye. See some of my early pictures of my JB where I show the main body after removing the tins. At least 40% is red primer, not Onan green.

Let me know how you want the pictures when finished and I can send them to you in high resolution. I plan to finish the project by 2025 as I am milking the project for all it's worth.

Well, it has been about 1.5 hours since the JB was primed. I think I'll wait at least another hour to top coat. I actually have about a day or so to wait using the type of primer I shot. In the meantime, I'll make another pot of coffee for lunch.

Standby for more pictures in the early to mid afternoon.

JohnnyC
New Jersey
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