LGB Porter smokestack thread info wanted

Paul2727

Paul2727

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As you may have noticed I've recent bashed together a porter / Lyn hybrid.
There's one persistent fly in the ointment that's really bugging me.
What on earth is the thread that LGB use on the Porter smokestack?
I've tried M7 and M8 coarse and fine pitch, but nothing wants to screw in properly.
I'd appreciate it if someone could let me know the correct thread.
Or if anyone has a damaged smokestack with the male thread intact they don't want, that would be helpful too.
Needed for my next project. (Steam log hauler.)
Thanks for reading.
Paul.
Kitbash crazy.jpg
 
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I have a straight-stack, from an Otto/Oho here, if that might be any good?

The original boiler moulding had been damaged, and it then did not survive an extended journey through the post..

Complete with two nuts.. One on the bottom of the stack, and one typing this. - Though the latter, is for communication purposes only! :D

PhilP.
 
PhilP said:
I have a straight-stack, from an Otto/Oho here, if that might be any good?

The original boiler moulding had been damaged, and it then did not survive an extended journey through the post..

Complete with two nuts.. One on the bottom of the stack, and one typing this. - Though the latter, is for communication purposes only! :D

PhilP.
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Thanks for the offer Phil, but I tried one already, they are totally different thread. (M8 coarse.)
Regards,
Paul.
 
Is the porter German or Korean, I think this may be were the issue is.
 
JimmyB said:
Is the porter German or Korean, I think this may be were the issue is.
Click to expand...
I believe it's German (The old analogue Toytrain model. 92377 'Rusty'.) ) with the brass threaded fittings set into the plastic and the metal handrails. All the marking say made in Germany and it has lead weights, so probably early 90's.
 
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Paul2727 said:
I believe it's German (The old analogue Toytrain model. 92377 'Rusty'.) ) with the brass threaded fittings set into the plastic and the metal handrails. All the marking say made in Germany and it has lead weights, so probably early 90's.
Click to expand...
Ah, I would have thought coarse metric, in that case, my HK is the Korean model, and the plastic is appalling, and would not risk undoing any screws again incase the plastic just disintegrates.
 
JimmyB said:
Ah, I would have thought coarse metric, in case the plastic just disintegrates.
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I've heard that about the Korean plastic, this thing is as tough of old boots so, certainly looks to be German.
The thread in question is defiantly a fine pitch though. So the search continues. Surely LGB didn't make their own thread just for this model of loco.2020-10-22 001 004.JPG
 
Greg Elmassian said:
At this point, perhaps an inexpensive set of vernier calipers for the diameter and perhaps a metric thread gauge are in order.

Certainly you will solve the diameter and pitch questions.

Greg
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Unfortunately my good (Mitutoyo.) vernier calipers and thread gauges along with all my engineering and modelling tooling are all stuck in storage, ready for the house move that should have happened three months ago.
Hence working on the coffee table with very basic tools.
Normally I'd have turned up brass replacements with a sensible thread, but I think you can guess where the lathe is...
The cheapo verniers come back with an overall diameter of 7.1 mm. I'm wondering if the thread isn't metric at all.
Not having any income since March hasn't helped much either..!
Don't you just love the side effects of this dratted virus. :(
 
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You could do worse, than an email to LGB/Marklin? - If the specifications exist anywhere, then I would have thought they would have them?? :nerd::wondering:

A politely worded request for help / information, also run-through Googly-translate (out of courtesy) may-well elicit a response?

PhilP.
 
Paul2727 said:
I believe it's German (The old analogue Toytrain model. 92377 'Rusty'.) ) with the brass threaded fittings set into the plastic and the metal handrails. All the marking say made in Germany and it has lead weights, so probably early 90's.
Click to expand...
"Casey" is the German remake of the Korean "Rusty" and better quality plastic. You can easily spot the Korean versions as they have a cast brass whistle and handrails where as the German versions have gold pated plastic. It addition is different plastic the German versions also have courser drive gears which are less probe to stripping.
 
That is weird, you would think it would be closer to 7mm exactly, or if anything a bit under. It does not fit common Imperial sizes other, just to check.

Very strange, perhaps retap it to a proper 7mm? Is there any way to get the pitch? Looks like it would be hard to measure with a fair amount of the thread recessed.

Greg
 
funandtrains said:
"Casey" is the German remake of the Korean "Rusty" and better quality plastic. You can easily spot the Korean versions as they have a cast brass whistle and handrails where as the German versions have gold pated plastic. It addition is different plastic the German versions also have courser drive gears which are less probe to stripping.
Click to expand...
My Anna is Korean, but with a plastic bell and metal handrails!
 
funandtrains said:
"Casey" is the German remake of the Korean "Rusty" and better quality plastic. You can easily spot the Korean versions as they have a cast brass whistle and handrails where as the German versions have gold pated plastic. It addition is different plastic the German versions also have courser drive gears which are less probe to stripping.
Click to expand...
Ok... So based on the brass whistle, oilers and handrails, the boiler casting could well be Korean despite the markings, I checked all 3 boiler castings I have and the smokestack does screw into all of them OK. I obtained a job lot of porter parts which included wheelsets with both coarse and fine toothed drive cogs, so it looks like it a bit of a mixture of the two.
Thanks for the info, good to know.
Looks like drilling out the threads and retapping might be my best option.
Regards,
Paul.
 
It doesn't happen to be IES (International Electrical Standard) lamp thread does it?

---Hutch
 
Hutch said:
It doesn't happen to be IES (International Electrical Standard) lamp thread does it?

---Hutch
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Hi Hutch,
Funnily enough I have ordered a selection of sizes of threaded lamp tubes to for use on other projects. I'd assumed they were a fine metric thread. Is there a difference then?
Paul.
 
Paul2727 said:
Hi Hutch,
Funnily enough I have ordered a selection of sizes of threaded lamp tubes to for use on other projects. I'd assumed they were a fine metric thread. Is there a difference then?
Paul.
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None of the metric or United Stated States Dies that I have fit lamp tubes properly. My dear sweet wife seems to require modifications to any lamp that makes it to the house.

---Hutch
 
Apparently, after rummaging in the lamp parts drawer, these are almost a pipe thread, but not tapered as U.S. pipe is. My metric pipe thread dies don't actually fit anything including our Italian manufactured John Deere. When you find a solution, please let us know.

Thanks ---Hutch
 
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