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Author Topic: Semi-rare Jensen 20 Big Power Plant  (Read 1828 times)

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Semi-rare Jensen 20 Big Power Plant
« on: May 02, 2019, 01:59:06 pm »
Just collected an engine at the local postoffice, that have lived on the wishlist for quite a few years now.
Scott orchestrated initial purchase and reshipping, and for that i am eternally grateful. Thank you my friend, MUCH appreciated !!!

I just ripped it out of the box, and shot these pics as is, but am certain that some simple cleaning, will bring this one back to as new condition.

Datewise itīs an early 80īs Jensen 20 as far as i can tell, and the "special" part about it, would be the blue anodized generator, combined with a #20 engine sporting a "valve stem stuffing box".

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Comparison pics of the engine itself:

The rear end of the piston valve bore is plugged.
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The "stuffing box" and 2 rivets/2 screws in side of steamchest.
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Standard #20 engine, with no "stuffing box" (please take my word for that), 3 rivets in the steamchest, and open piston valve bore:
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Cheers
Jan
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Re: Semi-rare jensen 20 Big Power Plant
« Reply #1 on: May 02, 2019, 02:07:21 pm »
I don't guess I even knew of such a thing Jan, I've  seen the "0"ring on the inside of the slide valve ...but never noticed the rest before , there is alot of extra work in that one.
Nice catch & assist from Scott.
looking forward to the video.
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Bruce, St. Paul Indiana, USA
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Re: Semi-rare jensen 20 Big Power Plant
« Reply #2 on: May 02, 2019, 02:15:12 pm »
This is all news to me. I've seen the blue anodized #15 bases before, but the valve spindle stuffing box is a new one on me.

Cool find and great Forum assist on the deal. Delighted to learn about this!!!
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Re: Semi-rare jensen 20 Big Power Plant
« Reply #3 on: May 02, 2019, 02:19:09 pm »
Nice haul Jan!
The valve stuffing box is also a new one on me, i take it was a factory special?

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Re: Semi-rare Jensen 20 Big Power Plant
« Reply #4 on: May 02, 2019, 03:22:11 pm »
Thanks guys, happy as a clam here

Yes Philip, it is a factory production, but i assume these were an experimental batch(es), rather than dedicated "specials".
However, thatīs all gueswork on my behalf, and would be very happy to be educated... GIL, need you here !!!

I naturally couldnīt resist testing it on steam, now that it was out of the box, and besides being a bit "dry", it performed very nicely.

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Jan
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Re: Semi-rare Jensen 20 Big Power Plant
« Reply #5 on: May 02, 2019, 03:37:29 pm »
Yea, it made it!

Great engine, that one.

Enjoy it, Jan.  It has certainly found a good home.
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Scott

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Re: Semi-rare Jensen 20 Big Power Plant
« Reply #6 on: May 02, 2019, 03:56:48 pm »
Thank you Scott !!!
Youīve made at least one person very happy today
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Jan
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Re: Semi-rare Jensen 20 Big Power Plant
« Reply #7 on: May 02, 2019, 03:58:46 pm »
Good looking steam plant Jan with an interesting twist - I guess I've got to pay more attention and learn more about Jensens.
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Larry

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Re: Semi-rare Jensen 20 Big Power Plant
« Reply #8 on: May 02, 2019, 04:13:32 pm »
You and me both Larry!!!
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Re: Semi-rare Jensen 20 Big Power Plant
« Reply #9 on: May 02, 2019, 07:38:09 pm »
What an interesting find you have acquired there Jan. All totally new to me mate.

I can see why your so happy to add that to your collection, looking forward to seeing what the old elbow grease does to this delightful piece of Jensen history.
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Jim

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Re: Semi-rare Jensen 20 Big Power Plant
« Reply #10 on: May 02, 2019, 07:42:27 pm »
I was definitely interested in this one when it appeared on eBay, and had I known what you knew about the steam chest, it may have cost one of us quite a bit more  ;)  :D

By the way, have you removed the video?
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Nick

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Re: Semi-rare Jensen 20 Big Power Plant
« Reply #11 on: May 02, 2019, 11:54:28 pm »
Thanks guys !

@Nick Yes, i somehow managed to make it "private", should be ok now?
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Jan
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Re: Semi-rare Jensen 20 Big Power Plant
« Reply #12 on: May 03, 2019, 12:24:11 am »
Ah, there it's back and well worth watching  8)
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Nick

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Re: Semi-rare Jensen 20 Big Power Plant
« Reply #13 on: May 05, 2019, 09:10:36 am »
I have one that is the same way. Has the stuffing box, 4 screws in side of steam chest and slide valve hole is plugged.  My engine has castiron base generator on it.
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Re: Semi-rare Jensen 20 Big Power Plant
« Reply #14 on: May 05, 2019, 09:14:12 am »
Sorry didn't add pictures  ::)
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