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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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  #3241  
Old 08-08-2017, 08:34:55 PM
TLB01 TLB01 is offline
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Default Re: What Have You Done to Your Onan Generator Today?

It got into the upper 80's today (with smoke) so it was time to run an exercise on the dkd (RatGen). I let it run for a good solid hour while monitoring battery charging and the like. The limiting factor ended up being the transfer switch, which did not like the two AC units running. When it is really needed, its typical cold/wet/wind so no big deal as the AC's won't be in the picture. Otherwise it ran great.

It gave more clues of having sat for a while. Rust broke loose in the water jacket and tinted the coolant a bit. At some point, its going to need a flush.

The most I put on it was 6k watts. Did not phase it. No black smoke etc. Hardly used ANY fuel.
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  #3242  
Old 08-08-2017, 10:07:14 PM
dmeed dmeed is offline
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Default Re: What Have You Done to Your Onan Generator Today?

According to the build sheet my contractors CCK left the factory on 8-8-57, which makes it 60 years old today. I put the starter back together and connected the battery to spin it over. Still a lot more pieces to get back in shape before it will be ready to run, but at least it turned over. Next job is clean the rust out of the gas tank, then fabricate an air cleaner (someone cut the bottom off the oil bath cleaner).

David M
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  #3243  
Old 08-09-2017, 04:51:17 AM
Handyhiker1 Handyhiker1 is offline
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Default Re: What Have You Done to Your Onan Generator Today?

I dont have the part numbrt handy but I do have a nos box style oil bath air cleaner. Has a few scratches from sitting around but still nice shape. If you need it let me know.
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  #3244  
Old 08-09-2017, 06:50:19 AM
dmeed dmeed is offline
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Default Re: What Have You Done to Your Onan Generator Today?

I actually hadn't thought of replacing the oil bath. Looking for a discussion of the pros and cons of oil bath vs paper filters. I figured the paper filter is likely better for my application of a genset that won't get used a lot - just random outages. I'm thinking it is less maintenance.

Don't the oil bath filters require maintenance every time before starting it and every few hours (10?) after??

THx

David M
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  #3245  
Old 08-09-2017, 09:56:12 AM
yellowlister yellowlister is online now
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Default Re: What Have You Done to Your Onan Generator Today?

If they do I'm guilty of not doing it.. I probably should change the engine oil and oil bath oil on my 72 cck contractors series I have only started it maybe 6 times in 2 years
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  #3246  
Old 08-09-2017, 10:13:37 AM
Combustor Combustor is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Unless you are running in a dust storm a proper oil BATH cleaner, (not oil damped foam) will hold a lot of dirt and run a long time. Messy job, but only clean out when there is 1/4" or more mud in the pan. replace with used oil, just as good. As long as water is kept out they will stand ready for years, and mice won't eat them.
Combustor.
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  #3247  
Old 08-09-2017, 10:37:51 AM
Troll Troll is offline
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Default Re: What Have You Done to Your Onan Generator Today?

I still run an oil bath air cleaner on my welding rig, (1957 B-61 Mack) and my mower tractor(s). I always change the oil in the reservoir with the engine oil at the same time. Both are operated in very heavy dusty conditions a lot. They do trap and hold a lot of dirt but easy to service and much less expensive than paper filter media.
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  #3248  
Old 08-09-2017, 12:18:42 PM
dmeed dmeed is offline
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Default Re: What Have You Done to Your Onan Generator Today?

The side of the air cleaner says "check to be sure there is oil up the the level before starting" and "clean out dirt and replace oil every 50 hours."

How long is a paper filter good for in average conditions?

And looking at mine compared to pictures of new ones it appears maybe someone took the oil cup off and never put it back on.

David M
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  #3249  
Old 08-09-2017, 01:10:23 PM
Troll Troll is offline
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Default Re: What Have You Done to Your Onan Generator Today?

No real way to measure duration of service as it's so varied in application. Most large trucks and tractors have a restriction meter (manometer) incorporated to the clean air side of the filter bank to measure restriction to airflow through the filter media. Obviously a truck or tractor used solely on highway is going to use a lot less filter changes than one operated predominantly off highway. Different filter medias have different restrictions from filter "loading" till they are considered "plugged". Donaldson, Hastings, WIX, and most of the major manufacturers have charts of their filters readily available. I have analog meters myself and watch them for replacement intervals. As mentioned, the oil bath styles I just change with the engine oil and really don't get concerned with them. There is always sludge in the pan of the bowl so know they are working.

I like oil bath myself as they are consistent. Any paper media becomes more efficient as it loads with contaminants till it is considered "plugged" requiring replacement. Oil baths are not, they are linear from start to finish.

If you maintain the proper level in the oil bath air cleaner, and don't upset the truck or tractor spilling any of the oil, they usually don't consume any so the level should remain relatively constant and level. I've seen several folks overfill thinking it will do a better job, but then engine vacuum picks up the oil and consumes it so don't do that. Oil bath air cleaners work by passing the airflow very close to the surface of the oil and the particulate matter is theoretically heavier than clean air and the turbulence throws these contaminants into the oil which then sinks to the bottom of the reservoir and becomes sludge you wipe and clean out at oil change.

They work very well but take a bit of work to maintain. Years ago this was routine maintenance and looked after well. No paper elements are much easier to upsell and install, so this is the way most folks prefer these days. I still prefer the oil oil bath myself.
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  #3250  
Old 08-09-2017, 11:13:06 PM
Troll Troll is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Damn when I get in a hurry I certainly make a lot of typing errors. Small keyboard and screen of a cell phone doesn't help matters neither. That, and no option to go back and make corrections makes it a bit difficult for me. As I've reread several of my postings, I notice this trend.

Guess I should slow down a bit.

Thanks,
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  #3251  
Old 08-10-2017, 06:56:31 AM
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Quote:
Originally Posted by Troll View Post
Damn when I get in a hurry I certainly make a lot of typing errors. Small keyboard and screen of a cell phone doesn't help matters neither. That, and no option to go back and make corrections makes it a bit difficult for me. As I've reread several of my postings, I notice this trend.

Guess I should slow down a bit.

Thanks,
You can join for 20 dollars and then you can edit.
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  #3252  
Old 08-10-2017, 07:16:38 AM
Troll Troll is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Quote:
Originally Posted by KPack View Post
You can join for 20 dollars and then you can edit.
No shit? I'll have to look into that.

Thanks,

Well, we'll see if it goes through this time as it's the second attempt.

Thanks,
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  #3253  
Old 08-10-2017, 07:36:03 AM
KPack KPack is offline
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Quote:
Originally Posted by Troll View Post
No shit? I'll have to look into that.

Thanks,

Well, we'll see if it goes through this time as it's the second attempt.

Thanks,
Reminds me I need to pay my yearly 20.00 . Pretty good knowledge and entertainment for 20.00 a year
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  #3254  
Old 08-10-2017, 08:19:05 AM
Troll Troll is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Sure is at times. I've had one hell of a time with this new laptop computer and paypay transactions. Effin govt. has it's fingers into everything we do and some things are transparent, some not so easy or damned near impossible till you finally get to talk to someone that can't even tie their own shoes but can flip a software switch to allow completion of a task.

Tried to sponsor the site a few months ago and it wouldn't let the transaction go through and I remiss; I forgot to get back onto it at home. Memory is the second thing to go as age creeps up on me.

Think I'll go hug my Onan and make it all better.

Thanks,
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  #3255  
Old 08-12-2017, 12:05:58 PM
Troll Troll is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Now that I've subscribed successfully, It looks like I can once again post photos.

This is a Caterpillar D398, (V-12) series genset in the basement of an airport. We have to take the floor out above it, and cut a hole in the roof as they've expanded the building enclosing this monster. No real way to support it easier than a single pick with a hydrocrane truck. As can be seen by the photo it is very clean. Only trouble is that it's 4175 Volts output.....
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  #3256  
Old 08-12-2017, 12:11:42 PM
Wayne 440 Wayne 440 is offline
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Default Re: What Have You Done to Your Onan Generator Today?

No problem, 4160 to 120/240 transformers are readily available.
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  #3257  
Old 08-12-2017, 12:31:09 PM
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Default Re: What Have You Done to Your Onan Generator Today?

Yup. Those and all the switchgear is coming out also. New terminal has been built and this is being relocated to another facility; not scrapped.
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  #3258  
Old 08-13-2017, 09:50:49 PM
yellowlister yellowlister is online now
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Default Re: What Have You Done to Your Onan Generator Today?

It's a cart making kinda Sunday! I had.. this good running 6.5 nh on cl for 240.. no calls.. so screw it I'll take it when I move.. gotta make a cart for it, I should say mounting base to bolt to the cart.. cause I had the cart I picked up years ago for 20 bucks I was going to use for a welder that turned out to be junk. welded up a exhaust for it.. need to get some rubber hangers for the exhaust. going to paint the cart later on..
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  #3259  
Old 08-13-2017, 10:48:00 PM
nothingbutdarts nothingbutdarts is offline
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Default Re: What Have You Done to Your Onan Generator Today?

Nice job Joe!

Just how many generators are you moving with you???
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  #3260  
Old 08-14-2017, 12:10:57 AM
yellowlister yellowlister is online now
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Default Re: What Have You Done to Your Onan Generator Today?

Ummmm.. 4 ccks.. 2 nhs ,djb, 3.0 dsl, 30 dda. 1 2.5 kw kohler and a tri fuel rjc, and 2 kubota d905s with Stamford gens...
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