Hi all,

I have found myself needing a replacement motor for those models equipped with the loud DCM (coffee grinder).
Interesting there are a number of threads and discussions about this using bell armature (Glockenankermotor) motors on other model railroad forums but not here on Marklin-users.

For those of us that are english speaking I am therefore posting here to provide info and start a discussion on these forums.

The original source of this conversion I believe is from German magazine MIBA SPEZIAL 71.

In that edition it was found a Glockenankermotor had the right dimensions to simply slot into the space from what a DCM motor would normally occupy.
All you would need to do is mill out the shaft hole and secure the motor with some glue (such as hot glue or epoxy) or some used a 3d printer to create a mounting housing for smaller variants of the motor.
This conversion won't work on every DCM model due to the space available inside the body but apart from e-loks (always have plenty of room) it seems the BR78 and BR86 are common candidates.

There are the higher quality and even quieter conversions available from SB modellbau (https://www.sb-modellbau.com/) but they do come at a price (typically ~100+ euro)

The MIBA SPEZIAL 71 conversions had the motor listed at 15.90 euro which is very cheap given little extra work required.

The article is a few years old now though and it seems the motor supplier (LEMO-SOLAR) have the price now at 49.20 euro, putting it into a price bracket closer to SB modellbau.

I have not looked thoroughly yet but maybe the chinese have the same motor available on ebay at a more comparable price to the original deal.

The MIBA SPEZIAL 71 Glockenankermotor:

https://shop.lemo-solar....zial-71-art-nr-2017r012/

The motor is 20mm diamater and 17mm long. I have read reports that 20mm might be a tad too small and milling would be required.

Other model motors:

https://lemo-solar.de/sh...delleisenbahnmotoren.php


Because of the possible fitment issue with the 20mm motor some users have used a 15mm motor and then had a 3d printed housing:

https://forum.3rail.nl/i...gipjvg&topic=60155.0

Here is a thread on converting a BR01 (33102). Also credit to Dave Banks who originally provided me the link.

https://forum.3rail.nl/index.php?topic=29623.0

And here we have another informative thread about the conversion with the MIBA SPEZIAL motor:

https://dieters-seite.hp...-fuer-maerklin-loks.html


The motor referenced in MIBA seems to be Faulhaber S2017R0412.

I have also seen the motor item 2017R012S used on stummiforums, though the code is no longer listed but there is 2017T012S on Lemo-Solar for 47.20
Not sure how it differs if it all from the MIBA Glockenankermotor

Going back even earlier to 2008/2009 there is the same discussion regarding the Lemo-solar Glockenankermotor:

https://www.modellbahnfo...tor-von-lemo-solar.1587/

Some threads on this topic over at stummis:

https://www.stummiforum.de/viewtopic.php?t=62640
https://www.stummiforum.de/viewtopic.php?t=140691

Please add any further information you may have on this topic.
I am particularly interested in sources of a suitable bell-armature at the ~20 euro price range and also what models this does or does not fit.

Part way through the conversion

I watched the video of the cheaper motor fitted to the 3044 shunter, and I felt it was still quite noisey. Not really an improvement over a Märklin five pole DCM.

For the record, I did not use a mill to do my conversion. It was all done with a small hacksaw, Drexel, and fine /modellers files, and of course a lot of patience.

I will try to get a video up of my BR86 running and then you can compare with the low cost option.

Maybe this principle can be used to quieten the old crane and the turntable. They are extremely noisy.
Dereck