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Kohler Generators

1951 Kohler 350M21 350 Watt Generator Set #154768


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  #11  
Old 05-19-2017, 10:38:01 PM
Vanman Vanman is online now
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

Worked on cleaning up the little Kohler this evening. When I got it, the oil was clean, but I did see a little sludge on the bottom, and I didn't know what oil was in it, so I drained it. Amazingly, even though I have run it literally for only seconds so far, the oil came out black!!

So I filled the crankcase with gasoline and sloshed it around while I was also cleaning the outside with gasoline and a paintbrush.

Upon draining, the gasoline was black. I filled and drained twice more, and twice more it came out black. Huh. Must be more sludge in there than I thought. I have it filled again, for now.

I really don't want to pull this one apart. It runs and sounds great. And I currently have a Wisconsin AA and a B&S ZZ apart, another ZZ with the flywheel off, and a bigger Kohler (1A21) with the generator apart. So I have PROMISED myself NOT to take apart anything else at this time!

Keith
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Old 05-20-2017, 08:08:17 AM
mschreiber mschreiber is online now
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

sludge clean out is a bitch. i always pull the pan after i know it'll pop/run. heres the last sludge full pan i cleaned up. good luck with ur project.

u do know about this show coming up soon? https://bestofthewestshow.com and i think a show "california gold" this weekend?

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Old 05-21-2017, 02:22:36 PM
YellowLister YellowLister is offline
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

Looks like a cool show I may go.. cool little kohler leave it be! I think I may have a original oil bath air cleaner for you
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Old 05-21-2017, 04:55:55 PM
Vanman Vanman is online now
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

Mschreiber- that's some serious sludge you have there!!

I don't think this one was anywhere near that bad. I drained the fourth installment of crankcase gasoline and it came out dirty, but definitely better. The fifth round came out almost as clean as it went in.

Now I'll run it for a bit with fresh oil, then change that, and it ought to be good to go.

The show looks great, but we have a small bus rally that weekend, and may not even​ make that due to other obligations.

Yellow- thanks for the offer on the air cleaner. At this point I'm reasonably certain that the parts I have are going to do the trick. If it doesn't work out, I'll get in touch with you and see what we can work out.

As for "leaving it the way it is", all I've done is clean some of the grime off of it. It is missing almost all of it's paint, but I have way too many projects, and way too little time, energy, and money to do much more than the bare minimum for any of them at this time. Paint would be a real luxury!

I am hoping to get in it's first test run with gasoline in the tank soon. I'll try to get video of it.

Keith
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Old 05-21-2017, 07:55:29 PM
mschreiber mschreiber is online now
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

that oil pan above was filled with gas like 4 times and was running mostly clear at 4th attempt. i stuck a bent weld rod into it and it was covered with goo. i pulled the pan.
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Old 05-21-2017, 08:59:59 PM
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

Ah, ok. It has it's first round of fresh oil in it now, and I've run it for a few minutes so far. When I drain it, I'll run some wire up in there and see what I can drag out of it.

Here's the first video of it running.

https://youtu.be/ZGTIBrAshKI
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Old 05-21-2017, 09:27:02 PM
mschreiber mschreiber is online now
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

nice.
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Old 05-22-2017, 12:04:09 AM
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

Thanks! Here's another video, taken at dusk, by the light of the bulb it was powering.

It appears that the needle and seat have decided to wake up, so I can leave the fuel on now. I set the governor to the most sensitive position, and the regulation is improved considerably as a result. I slightly adjusted the mixture as well, and now no more little random misfire, it can idle down slow and smooth, and let go of the governor and it comes right up to speed, without hesitation.

I want to add a small spring between governor arm and carburetor to take up the slack, and I'd like to turn up the speed slightly. The latter will require some studying as there is not any obvious way to increase the speed, other than lengthening the linkage between governor arm and carb.... Right now I'm seeing around 108 ish volts and 56 cycles or so with ~250 watt load.

https://www.youtube.com/watch?v=otTJ...ature=youtu.be

Keith

Last edited by Vanman; 05-22-2017 at 01:54:22 AM.
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Old 05-22-2017, 02:03:08 AM
Thaumaturge Thaumaturge is offline
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

Keep in mind that when that gen was made 110VAC was a bit of a standard. Then 117, 119 and finally 120, as I recall the progression.

The feet look nice (other than seeming too new.) When you first asked for suggestions McMaster came to mind. But reading further I see you found them. I got a great set of heavy duty vibration issolators from them for a compressor that was affecting our mechanical calibrations at a cal lab I worked at.

Your idea of rinsing out the block with gas was a good one. I've rinsed out a genset with diesel fuel before and know it to be effective. I figured diesel would leave a bit of lube while still desolving the crud.

Nice little generator.
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  #20  
Old 05-22-2017, 08:48:25 AM
mschreiber mschreiber is online now
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Default Re: 1951 Kohler 350M21 350 watt generator set #154768

i rinsed out my d13000 genset with gallons of diesel, prob is u can't pick it up and slosh it around. after this i pulled the inspection covers and pulled out 4 gallons of slimy sludge. non detergent oil builds up sludge over the years. nuff said.
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