Contact Us!
  • White Facebook Icon
  • White YouTube Icon
Subscribe for updates!

Subscribe to receive email updates from time to time. Never miss a thing and unsubscribe whenever you like.

This website and forum is free to use. The vast majority of video content produced is available on youtube.

However, should you find Charlotte's Steam Clinic useful and if you fancy supporting this platform/content, you can become a Patreon for as little as $1 per month. There's no obligation, it's just a nice way to help out and to show appreciation for the time that goes into this platform. 


If you prefer to use PayPal or if you would like to make a stand alone donation (and not a monthly one) here's a link to our PayPal account. Thanks again if you make a donation. It makes a difference to us. 

© 2017 by Charlotte's Steam Clinic Proudly created by Visual Trailer Ltd.

J. Meaney
Apr 6

Stuart 3MTB stationary engine (Help needed)


I recently acquired a Stuart Turner 3MTB stationary engine. Unfortunately the slide valve and ancillary parts are missing. does any have or know where I could get drawing of these parts. I have contacted Stuart Turner who no longer have any of the old drawings or parts. Below is a top view of the valve chest. Any assistance would be appreciated.

View of valve chest without cover


May 22

Hi there J

i have a Stuart MTB 1b with the same problem.

for an idea of what it should look like go to my website

And scroll to the bottom, I know it’s not the exact same engine but having worked on several of the high speed marine twins I can say that there is a lot of similarity between engines with a little bit of evolution thrown in.

so effectively the valve will be the same as for a dual action single cylinder engine. You may find one of the standard Stuart valves is compatible but you would need to measure the ports exact dimensions.

alternately you may need to make your own.

I have marked up the dimensions you need on your picture.

if you send them to me I will check out some of Stuart’s valve I have access to to see if one is suitable.

as I am trying to fill up my website with as much info as possible about all the engines I would appreciate some photos. Also when you get it running, Chuck a video on YouTube so l can link to it.




J. Meaney
May 27

Hi Steve,


Thank you for contacting me re the S.T. 3 MTB. My apologies for the delay in replying but I have been very busy and have not had time to do any work on the engine. I will measure up the dimension as suggested by you and get them to you in the next few days. Again thank you for replying and looking forward to any information or advice that you might have.



May 27

Hi John,


This looks like the same engine from the Unofficial Mamod Forum.


I posted a set of photographs and drawings of the missing parts on that forum, 22 April.


If you wish, I can re-post them here for you?



J. Meaney
May 28


I replied to your message yesterday but it appears that it did not publish. you are observant, it is the same engine. I sent a query to this forum before I became aware of the Unofficial Mamod site and got a first reply from Steve in the last few days. There is no need to re-post the photos and drawings as I have them filed safely.



J. Meaney
May 28



Listed below are the dimensions suggested by you:


a: 14.74mm / 0.567 inches

b: 14.48mm / 0.570 inches

c: 7.24 mm / 0.285 inches

d: 9.75 mm / 0.385 inches


I have also included these dimensions.

e: Width of valve chest: 22.40 mm / 0.878 inches

f: Depth of valve chest: 10.17 mm / 0.4 inches


Any help would be appreciated,



New Posts
  • CastingIronEngines
    May 13

    I saw a photo of a green twin oscillating steam engine on the Preston Services website a few years ago, and a Canadian buddy of mine challenged me to make one. Long story short, I built a foundry, used a 3D modeling program to model the engine using 3 photos, made the patterns, and cast the parts for a 60% scale engine. I recently got the engine running, and it can be viewed here: The plan at this point is to finish the painting work on the engine, and publish it in Live Steam and Outdoor Railroading magazine. It was a long journey to learn the foundry work, but I was able to cast some of the parts in gray iron, with the remainder being cast in 356 aluminum.
  • jatolton
    Sep 6, 2018

    Hello everyone... my name is Jason and I am from Northern Ontario. I recently purchased some steam engines from an estate sale and there is one that is rather interesting. It looks like a Stuart S50 model like right down to the nuts and bolt pattern on the valve cover.... although the crank web on mine is bell shaped where on the early Stuart S50 it is round. The people at Stuart in the UK think it is a 40's ish model based on the photos. I questioned mine because it does not have the Stuart nameplate on the top of the base... where it is located on engine. They sent me a picture of an old model without the Stuart sign on the top of the base but at the bottom instead. The people in the UK say that picture has the Stuart sign on it is photo shopped and there is really not one on it at all. On the pictures of my engine I have put a gold ring on where the Stuart sign is normally. I have never seen a knock-off anywhere online. Opinions are certainly appreciated. Stuart thinks I have the real deal.... and possibly a gem. Any thoughts on the engine? condition, authenticity, value? Thanks so much, Sincerely, Jason.
  • Joshua Kilen
    Jun 25, 2018

    Hello My name is Joshua Kilen and I am from the US. I am wondering what is the best type of compressed air lubricator? A fog/mist type or a Oil drop type? The steam engines I am will be running are in this Video: This is My channel and I do have other steam engine videos on my channel, here is the playlist of my steam engines: