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Mamod SL loose chimney repair

 
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SLR


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Joined: 11 Jul 2014
Posts: 350

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PostPosted: Sat Aug 12, 2017 12:11 pm    Post subject: Mamod SL loose chimney repair Reply with quote

Loose chimneys on the older Mamod SL (and MSS) locos seems to be quite a common issue.
Originally, they we swaged on, usually with what would appear to have been a tool with four lugs:



Being made from relatively soft aluminium alloy, and often subject to knocks and bumps, they work loose. They cannot be soldered back on due to the material they're made from, and using some sort of adhesive doesn't seem to last due to the heat and exposure to steam and oil. I thought I'd have a go at trying to re-swage one, and knocked up this tool from scrap bits:



Here it is in place:


This worked very well, but I sometimes find that the original chimneys are very poor quality castings. They often have surface pits, very rough and visible mould lines, and on occasion are not even straight!
By accident, I discovered these:


They are brass components used to make decorative light fittings and chandeliers. The threads are metric M10x1, and they are quite nicely made. They are just the right size to make replacement chimneys for these locos, and you don't need any special tools or a lathe to do this.
Standard chimney:



Plain brass cap:



Decorative brass cap:



Hopefully this will be of use to someone.

I bought the brass lamp components from this seller on Ebay:
http://stores.ebay.co.uk/Bit-of-Brass
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wyvern


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Joined: 01 May 2007
Posts: 460

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Location: Littlehampton, UK

PostPosted: Sat Aug 12, 2017 12:53 pm    Post subject: Reply with quote

I have found jb weld is certainly able to cope with the heat and oil as long as the joint is well prepared.  That said that's a nice tool you have made.
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gen3v8


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Joined: 13 Aug 2014
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Location: Botany Australia

PostPosted: Sat Aug 12, 2017 6:40 pm    Post subject: Reply with quote

I have used a green Loctite on a SL1. Seems much better than original.
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Jon Cameron


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Joined: 25 Aug 2015
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PostPosted: Sat Aug 12, 2017 9:59 pm    Post subject: Reply with quote

A nice solution to a common problem  
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stenella


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Joined: 25 Mar 2010
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PostPosted: Sun Aug 13, 2017 5:24 am    Post subject: Reply with quote

Top tip there! Thanks for sharing!
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The Denying Dutchman


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Joined: 01 Jun 2010
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PostPosted: Sun Aug 13, 2017 8:47 am    Post subject: Reply with quote

A nifty little tool, I like the decorative brass cap too!
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SLR


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Joined: 11 Jul 2014
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PostPosted: Sun Aug 13, 2017 8:13 pm    Post subject: Reply with quote

Yes, I know it is possible to glue these things fairly successfully sometimes; I've done it myself. However, I've never really been happy about it, as I've never considered it to be a "proper" repair. Also, as I mentioned, some of the original chimneys were a bit... ropey:


I've tried to clean and straighten these things on the lathe with little success; they are actually tapered, more so on the inside than outside, and the metal is often quite porous. The great thing about these brass lamp components is that they are not too expensive, and no special tools or lathe is required to fabricate a new chimney. For example, the decorative cap mentioned above started out as what is described as an "ornamental joiner" and costs 1.80. Cut it in half, and you have two chimney caps:


Add a threaded tube, nut, all-thread nipple, a bit of paint and some time, and for a little over 5 you can have a permanent, more attractive solution. To put things in perspective, DreamSteam charge 3.30 for a little push-on brass cap.
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