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Can a 30 year old DC Mantua Steam locomotive be converted to DCC

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  • Member since
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Posted by Scott U on Monday, February 25, 2019 10:02 AM

Yes it does. smooth and strong.

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  • From: Bakersfield, CA 93308
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Posted by RR_Mel on Saturday, February 23, 2019 7:53 PM

BigDaddy

You guys may have talked me into converting one.  For some reason the idea of taking apart a steam engine, is more daunting than a diesel. 

 

Do it to it Henry!  I had a blast rewiring my locomotives.  It’s been over ten years but even my old brain remembers doing it.  Using the standard 8 pin NMRA connector worked out the best for me.  I can swap out a decoder in a few minutes and run any one of my 70+ locomotives.  I only have a few decoders, can’t afford to put decoders in all of my locomotives.  Besides I can only run two trains at a time on my small layout.  I did build up a pair of generic oil tenders for my Cab Forwards and AC-9s so that I don’t need to swap those decoders, just the tenders.
 
I did go with a 9 pin connector in two E7As with active MARS lights.  I run those more than any of my others diesels.
 
 
 
Mel
 
 
My Model Railroad   
 
Bakersfield, California
 
I'm beginning to realize that aging is not for wimps.
 
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  • From: Shenandoah Valley
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Posted by BigDaddy on Saturday, February 23, 2019 6:46 PM

You guys may have talked me into converting one.  For some reason the idea of taking apart a steam engine, is more daunting than a diesel. 

Henry

COB Potomac & Northern

Shenandoah Valley

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Posted by rws1225 on Saturday, February 23, 2019 6:23 PM

WinkThanks, I'll get my shoehorn out and get started.

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  • From: Bakersfield, CA 93308
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Posted by RR_Mel on Friday, February 22, 2019 10:02 AM

rws1225

Mel,

I have one of those 0-6-0s and am contemplating a dcc conversion.  What decoder, etc did you cram into this loco?

 

About 10 years ago I rewired all of my locomotives to DCC using the standard NMRA 8 pin connectors.  I only have a few decoders and I move them around depending on which locomotive I want to run.  I started out with MRC and for the most of it I have continued using the MRC decoders.  I have purchased other manufactures decoders and all use the standard 8 pin NMRA connector. 
 
So the answer to your question is any decoder will work great in my MDC 0-6-0.  I normally use a MRC 1731 Steam Decoder in one of my 0-6-0s.  I have Digitrax SDH166, TSU1000 and MRC 1730 & 1731 decoders.  The only one I can squeeze into an MDC Shay is a Digitrax SDH166D.
 
Early on I was buying the cheapo thin 28mm speakers but I run into a very good sounding 1” speaker that put most speakers to shame.
 
 
Those are 4Ω speakers so I put a pair in series to get to 8Ω if I can squeeze them in.  A 4Ω resistor in series works OK when I can’t fit in two.
 
I couldn’t squeeze a 1” speaker in my slopeback tender so it has a cheapo speaker. It does sound OK but the pair of 1” speakers in my Vandi shorty tender sound much better.    
 
 
 
Mel
 
 
My Model Railroad   
 
Bakersfield, California
 
I'm beginning to realize that aging is not for wimps.
 
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Posted by wjstix on Friday, February 22, 2019 9:32 AM

Just to throw in my two cents....

To isolate the motor on my Mantua engines, I removed the motor and put down a layer of rubber electrical tape on the frame where the motor sits, and then reinstalled the motor using plastic 2-56 screws.

Starting in about 1990, Mantua offered a retrofit kit to replace their open-frame motors with smooth running Sagami can motors. Even though they haven't sold them for a while, you probably can still find them online. I've done a couple of conversions and it works very nicely.

As far as I know, no Mantua-manufactured engines (i.e. before Model Power) had sound or had tenders set up with speaker enclosures. So, yes, you can add sound, but you would need to get a drill bit designed for cutting metal and drill holes in the metal tender deck to make an opening for a speaker. (You might replace the tender with either a later Model Power / Mantua one, or one from some other manufacturer like MDC (Athearn) that is set up with a speaker opening.)

 

Stix
  • Member since
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Posted by rws1225 on Friday, February 22, 2019 9:29 AM

Mel,

I have one of those 0-6-0s and am contemplating a dcc conversion.  What decoder, etc did you cram into this loco?

  • Member since
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  • From: Bedford, MA, USA
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Posted by MisterBeasley on Thursday, February 21, 2019 7:10 PM

Does it work well on DC?

A decoder needs a good-working engine.  It will not improve a poor engine, though.

It takes an iron man to play with a toy iron horse. 

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Posted by richg1998 on Thursday, February 21, 2019 3:18 PM

About ten years ago I did an all metal MDC HO 4-4-2 but had to send it to NWSL for a new motor. The old one needed about 1.4 amps at 12 vdc. I did not want to mess with modifying the motor.

Rich

If you ever fall over in public, pick yourself up and say “sorry it’s been a while since I inhabited a body.” And just walk away.

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Posted by Scott U on Thursday, February 21, 2019 12:48 PM
Thanks for such a quick reply, Look easy enough, can a speaker also be installed in the tender?
  • Member since
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  • From: Bakersfield, CA 93308
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Posted by RR_Mel on Thursday, February 21, 2019 9:35 AM

Yes, piece of cake!
 
I have rewired all but a couple of my locomotives for DCC operation (DCC ready).  That includes a 1951 MDC Roundhouse 0-6-0 and two 1960s MDC Roundhouse Shays.
 
I even installed a speaker in a 0-6-0 slope back tender and it sounds great chugging around my layout.
 
 
 
 
 
 
Mel
 
 
My Model Railroad   
 
Bakersfield, California
 
I'm beginning to realize that aging is not for wimps.
 
  • Member since
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Posted by snjroy on Thursday, February 21, 2019 8:26 AM

Excellent advice there. One of the golden rules is to make sure your loco runs well on DC before doing the conversion. A keep-alive decoder will somewhat compensate for the limited number of power-pickups.

Simon

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  • From: Yorkton, Sk, Cnd
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Posted by wvg_ca on Wednesday, February 20, 2019 7:36 PM

sure .. not a problem ...

while you are at it, upgrade the power pickup from the wheels, and maybe upgrade the motor, if it's not a can type already ..

  • Member since
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  • From: Collinwood, Ohio, USA
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Posted by gmpullman on Wednesday, February 20, 2019 7:01 PM

Sure.

Two of my oldest locomotives that I have installed decoders in are fifty years old, at least.

In its simplest form a decoder essentially installs between the pair of wires leading from left and right rails to both motor leads + and - .

If your Mantua picks up power from one side of the locomotive and the other side from the tender wheels these will each go to the black and red inputs of the decoder.You should also check the "stall current" of the motor, too. This is not as critical as it used to be as some newer decoders have higher motor current limits but you should be sure your motor draws one amp or less.

THIS GUIDE is geared toward a Soundtraxx decoder but the information here is good and it is applicable to many other DCC decoder installs.

https://www.soundtraxx.com/manuals/Installation-Guide.pdf

Whichever terminal of the motor is plus, this would get the orange output wire from the decoder and the gray wire to the minus side.

The plus terminal of the motor is the one that makes the locomotive move forward when positive DC power is applied (you can test this with a 9V battery).

SOME older locomotives and especially brass engines, one electrical side of the motor is common with the frame of the locomotive. This connection has to be isolated.

I did it on this motor simply by insulating the brushes from the motor frame:

 DD1-DCC1 by Edmund, on Flickr

You can see where I soldered the gray and orange wires directly to each brush assembly.

 DD1-DCC3 by Edmund, on Flickr

The decoder I chose in this case is one that has a built in "keep alive" capacitor which helps older engines with poor track continuity keep rolling in spite of breif power interruptions.

 

 Hope that helps, Ed

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Can a 30 year old DC Mantua Steam locomotive be converted to DCC
Posted by Scott U on Wednesday, February 20, 2019 8:58 AM

After a 30 year wait, I can now have sufficent space for a layout. I have many locomotives 30 years and older. I have seen people converting the "blue box" diesels on YouTube to DCC so I'm going to do that as time permits, however I haven't found anyone who has done so with a Mantua steam loco. (perhaps my search technique needs some refining?)

Thanks for the help

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