Stuart 3MTB stationary engine (Help needed)

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.

steve

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.

John

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?

Ray

Ray,

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.

John

Steve,

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,

John

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