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Old steamers (BR01 3048,...) chimney manufacturing
 Joined: 25/08/2008(UTC) Posts: 633 Location: Montlouis sur Loire, France
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Hi all, You may remember this topic: https://www.marklin-users.net/fo...ult.aspx?g=posts&t=12585where an old BR01 3048 was "overhauled", and it was stated that everything on it was built to last...except its chimney insert, which in early models is made from a material (fiber? plastic?) which gets worse as time goes by. In this particular model, the chimney insert had lost some material and its appearance was not good anymore:  This is the chimney insert once it has been disassembled from the loco:  You can see that its condition its poor... Yesterday I visited a friend who has a small workshop in his garage. As we had some spare time I asked him to try to manufacture new chimney inserts made from stainless steel. And this is the result. This was some kind of "approximative" test, actual parts are slightly oversized but they appear to be OK, in particular if the original part is not there to compare. Moreover, the smoke unit can be fitted to the new parts:  This one compares old vs new part:  This one shows how it gets when assembled on the loco:  This one compares a loco with the old insert vs another with the new insert:  |
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 Joined: 17/09/2006(UTC) Posts: 18,772 Location: New Zealand
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Very clever approach to repairing the faulty item.
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 Joined: 21/10/2004(UTC) Posts: 31,692 Location: United Kingdom
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Large Marklinist 3- Rails Layout with CS2/MS2/Boosters/C-track/favorites Electric class E03/BR103, E18/E118, E94, Crocodiles/Steam BR01, BR03, BR05, BR23, BR44, BR50, Big Boy. |
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 Joined: 14/03/2005(UTC) Posts: 15,870 Location: Gibraltar, Europe
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Very good repair, Brakepad.
The old lady can smoke again! |
Ray
Mostly Marklin.Selection of different eras and European railways
Small C track layout, control by MS2, 100+ trains but run 4-5 at a time.
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 Joined: 22/01/2009(UTC) Posts: 14,875 Location: On 1965 Märklin Boulevard just around from Roco Square
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S/S is not the best electricity conducter.
Did you have problems with it.
regards.,
John |
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Joined: 25/08/2008(UTC) Posts: 633 Location: Montlouis sur Loire, France
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Quote:[size=1" face="Verdana" id="quote]quote:Originally posted by river6109
<br />S/S is not the best electricity conducter.
Did you have problems with it.
regards.,
John
Hi John, Even if S/S resistivity is much higher compared to, i.e., copper, the absolute value of the resistivity of the chimney insert, between the housing and the smoke unit would be low enough to allow perfect operation of the smoke unit. Thickness of insert between the housing and the smoke unit is very, very low (less than 1 mm), and IMHO the housing itself would have a higher electrical resistivity than the S/S chimney insert. However, this locomotive (3048) does not rely on the chimney to conduct electricity to the smoke unit (in fact the original part is made from an isolating material!), but on two copper plates located beside the light bulb. See:  So far, I have had no problems at all with it, and appearance has improved a lot, IMHO. Perhaps this would be more noticeable if the loco was resprayed. Thanks and regards. |
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 Joined: 23/08/2006(UTC) Posts: 2,597 Location: Beverly, MA
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Joined: 22/01/2012(UTC) Posts: 1,047
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Originally Posted by: Brakepad  Quote:[size=1" face="Verdana" id="quote]quote:Originally posted by river6109
<br />S/S is not the best electricity conducter.
Did you have problems with it.
regards.,
John
Hi John, Even if S/S resistivity is much higher compared to, i.e., copper, the absolute value of the resistivity of the chimney insert, between the housing and the smoke unit would be low enough to allow perfect operation of the smoke unit. Thickness of insert between the housing and the smoke unit is very, very low (less than 1 mm), and IMHO the housing itself would have a higher electrical resistivity than the S/S chimney insert. However, this locomotive (3048) does not rely on the chimney to conduct electricity to the smoke unit (in fact the original part is made from an isolating material!), but on two copper plates located beside the light bulb. See: So far, I have had no problems at all with it, and appearance has improved a lot, IMHO. Perhaps this would be more noticeable if the loco was resprayed. Thanks and regards. The earlier model may rely on the two plates. If memory serves me right on later models you have only the bottom plate but no side plate. This post makes want to go through opening the different versions to check on differences. Must be that my oldest ones are in perfect condition but I've never noticed the chimeney wasn't metal, everything seem to be the same material. Thank you for posting the photos.
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