Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines
The Regular Stuff: Chat, Buy, Sell, Off Topic, etc. => General Discussion - Model & Toy Steam Engines – Stirling Cycle – Flame Lickers – Small Antique Originals => Topic started by: komet163b on January 27, 2026, 03:04:01 pm
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I had this hole saw tucked away in my Amazon cart in case I ever wanted to try and retrofit a Jensen sight glass to some future purchase: https://www.amazon.com/gp/product/B0B3XQFZTR/ref=ox_sc_saved_title_9?smid=AOAWBY89MKXUL&th=1
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If the price is right...
Well, besides making/soldering a steampipe, the owner could solder
a disk of brass over the hole and start from there. Run it like that
or....try to add a sightglass. If the proper parts show up you could
just unsolder the disk and go from there.
For me, the hook is the patterned base. I could live with no sightglass.
If the price is right,
Wayne
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When I get one of these I cringe and just hope it doesn't leak badly. I had to unsolder the whole fitting from the boiler on the long one and used a piece I cut out of lexan as a mica substitute. There should be a discussion of these somewhere on the Mamod forum but hard to search and find things there.
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That's the inner receptacle; cover is gone. I guess both were stamped with the number.
I did not know that, and hope I don’t have to verify that on mine anytime soon! 😂
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That's the inner receptacle; cover is gone. I guess both were stamped with the number.
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Very hard to see on eBay pics, but pretty sure it does have the ring as I think I can barely make out the D.R.G.M. number (Which I believe is like a German copyright?)
I would ask seller for better pics of that area before bidding…
[attachimg=1]
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Nick's photos confirm what I thought. The Ebay one is missing not only the glass but the cover which holds it in place. Plank crimped those covers over what you see in the photo so they are very difficult to remove and replace. Would also be very lucky if an off-the-shelf glass fits. Plank also made this fitting as vertical sight glass--equally painful to deal with. But go for if you like it--maybe we can figure something out.
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Here is the one I have here. I did not know it was a sight glass example as the seller didn’t include that end of the boiler in the pictures, so it was quite a surprise when it arrived!
[attachimg=1]
[attachimg=2]
[attachimg=3]
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A couple of suggestions. You might want to find some Borosilicate glass disks that could fit the opening with an appropriate mounting sleeve, or you could try and find a replacement disk from jensen, or other suppliers close to the opening and make a sleeve adaptor as above.
Either way it would make a fun project, learning a lot. Even getting a few engines with that type of glass just to see how to make an adaptor that would work correctly. The use of an O ring might help the seal work better.
Until you had the engine in hand then the solution might follow. It would be great if you had an actual picture of the engine complete or some who had one.
Hard to tell from the ebay listing what shape the rest of the steam plan is in. Looks like no burner, May have been a pressure gauge in that open hole on top, and as you pointed out the steam line and stack would need to be made. Lots small projects, and then a real cool plant, and lots of experience under you belt.
Bob
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Plank did this long before Wilesco. And Nick is right--a very difficult repair. Can't remember now but it may also be missing something that is crimped over the mica. Could also use glass or something like lexan.
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Thanks for providing that detail, Nick, I was really wondering what that big hole could actually be. Didn't know that the German makers made such water sight glass windows back in the day.
Mica windows at that ... WOW!!!
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These have a Mica sheet sight glass that is not easy to replace. The seal/ring is crimped/pressed on.
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I am not sure which hole, the one in the end cap or the one on top? I think the one on top is the steam pipe and valve you mention. The endcap one is the boiler glass like on this jensen 65 https://www.ebay.com/itm/317797614656
Bob
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This E Plank engine, on EBAY, has a big hole in the boiler
cap. What is missing and does anyone have a photo of what
belongs there? It is also missing the steampipe.
I'm mostly interested because I'd like to have one engine
with an original vintage 'patterned' base. If it is fixable...
A link and photo follow
https://www.ebay.com/itm/187992168076
Wayne