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Offline skeeterbuck  
#1 Posted : 23 November 2018 19:03:28(UTC)
skeeterbuck

United States   
Joined: 15/12/2015(UTC)
Posts: 523
Location: Maryland, Baltimore
I have an older Märklin 3085 and the single screw in the boiler dome that holds the boiler casting to the frame is stripped out. The screw is OK. it's the threads in the frame casing that are stripped. I now am using a very thin strip of toothpick wood to hold the screw snugly but am looking for possible recommendations for a more permanent or "correct" fix. I thinking of more along the lines of using a metal epoxy type product and then re-tapping the threads in the metal. I don't want to completely replace the frame casting.

Any ideas? Thanks!

Offline dominator  
#2 Posted : 23 November 2018 21:32:10(UTC)
dominator

New Zealand   
Joined: 20/01/2015(UTC)
Posts: 1,195
Location: Kerikeri
Considering the limited number of times you may need to remove the body, what you have done with the toothpick will be less messy and simpler.
There is a loctite product though which may help. It involve putting the product in the hole, covering the screw with a releasing agent and pushing the screw in the hole. Unscrew the screw when set. Its something we had to do sometimes in the automotive field, but very rarely as we usually used helicoils. I dont have any idea if they make helicoils in such fine metric threads though.

Maybe a small pc of tinfoil, cut to size and fitted in the hole. The screw might grab onto that. It would be more even than the toothpick but might not last any longer than the toothpick idea.

Dereck
Northland. NZ REMEMBER 0228 for ä
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Offline Legless  
#3 Posted : 24 November 2018 10:02:37(UTC)
Legless

Australia   
Joined: 20/07/2007(UTC)
Posts: 809
Location: Leopold, Victoria
Hi Skeeterbuck, you can get yourself some polymer epoxy.
If possible get the steel one.
Now the fun begins.
With the screw rub a very thin coat of vasoline or a bit of candle wax on the thread section. Put on nitrate gloves on. Now cut a small piece of the polymer epoxy. It should be one color on the outside and another color on the inside. Mix the two together until you get one color. Then place the screw-in the boiler dome and wrap around the threaded section that touches the chassis. Carefully place the body on the chassis lining up the screw so it goes into the chassis.
When the polymer sets unscrew the thread and clean up the excess polymer. It there is a gap in between the polymer and the chassis, mix up abit more to fill the gap.
Tip to smooth polymer just wet your finger, rub over the surface and it will go as smooth as you want.
Mike
Legless
Era's 1 to 111,C track,k track
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Offline Legless  
#4 Posted : 24 November 2018 10:07:49(UTC)
Legless

Australia   
Joined: 20/07/2007(UTC)
Posts: 809
Location: Leopold, Victoria
If you can’t get some steel grade polymer epoxy try to get high temp polymer epoxy. If not you can use 24hour epoxy but this can’t handle heat.
Legless
Era's 1 to 111,C track,k track
Offline Henrik Schütz  
#5 Posted : 29 November 2018 08:30:05(UTC)
Henrik Schütz

Sweden   
Joined: 04/08/2015(UTC)
Posts: 74
Location: Stockholms Lan, Stockholm
Sure helicoil is made in that size, try an motorcycle repair shop or similar.

In the end , it will be cheaper to locate a used part, but personally im not into Marklin to save money, in fact its more like a hobbyBigGrin

Henrik
Offline Henrik Schütz  
#6 Posted : 29 November 2018 08:36:30(UTC)
Henrik Schütz

Sweden   
Joined: 04/08/2015(UTC)
Posts: 74
Location: Stockholms Lan, Stockholm
The Screw is a M3 x 10 mm

If that is to any help.

Henrik
Offline Bigdaddynz  
#7 Posted : 29 November 2018 10:34:25(UTC)
Bigdaddynz

New Zealand   
Joined: 17/09/2006(UTC)
Posts: 18,661
Location: New Zealand
Originally Posted by: Legless Go to Quoted Post
Hi Skeeterbuck, you can get yourself some polymer epoxy.
If possible get the steel one.


Something like this??

https://www.bunnings.co....-repair-system_p00239197
Offline Torstein  
#8 Posted : 29 November 2018 11:57:30(UTC)
Torstein

Norway   
Joined: 27/03/2010(UTC)
Posts: 338
Location: Norway
Hi

Put the end of a sewing thread into the hole - set in screw - cut the thread after the screw is solid. Used this method for years.

Torstein
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Offline Carim  
#9 Posted : 29 November 2018 14:51:02(UTC)
Carim

United Kingdom   
Joined: 15/09/2014(UTC)
Posts: 649
Location: London
Hi,

Maybe plug the hole with Blu Tack (made by Bostik) and then just screw the screw into this.

Carim
Offline Drongo  
#10 Posted : 30 November 2018 13:11:58(UTC)
Drongo

Australia   
Joined: 03/06/2008(UTC)
Posts: 1,221
Location: Sydney, NSW
Why not fill the hole, drill a 2.3mm hole and then use a M3 tap.
Take it easy . . . . or any other way you can get it !!!!
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Offline skeeterbuck  
#11 Posted : 30 November 2018 14:05:40(UTC)
skeeterbuck

United States   
Joined: 15/12/2015(UTC)
Posts: 523
Location: Maryland, Baltimore
I got an M3 thread repair kit coming from ebay ($24 + free shipping). When I do the repair I'll try and remember to take some pics and post them here as a little tutorial on the process. No exactly the cheapest way to go but I think the best and proper way to fix the threads. If all goes well it should never strip out again, at least not in my lifetime. Laugh
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