Engines > Restoration of Model Engines

Old Stuart S50

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Sanjay F:
Another restoration as I wait for parts for my new build

This time a crusty ole Stuart S50 which is slightly unusual as the valve chest and cylinder are a single part - I believe this is how they were originally made?

This is very rusty and missing the eccentric rod and the bit that connecting it to the valve rod - can someone help me out with the dimensions of those bits please? From what I have seen the eccentric rod has a point at one end which locates through the strap into the sheave stopping it from slipping off?

Here's some pics of the fine old S50 ripe for restoration

crueby:
Rusty, but a nice looking engine overall. That one-piece steam chest was used on a lot of full sized engines, but fell out of favor for models since it is very hard to get a good finish on the valve face down inside the chest. How many more of these old engines are waiting in the wings? Neat engines!

Jasonb:
Here you go, just check to see if yours is BA or 3/32" whit

If you change the last number in the url you can get all parts of the build and associated drawings

https://www.model-engineer.co.uk/wp-content/uploads/sites/4/documents/sally-8.pdf

Sanjay F:
Oh briliant thank you ..... that's handy having the build as there are bound to be some other bits 'n' bobs. Good point I'll check the thread before diving in  :ThumbsUp:

I made a new cross head guide rail and supports as one was missing, and machined the crankpin as it was scraping against the soleplate; seems to be running smoothly now. This is so pitted it must have been somewhere very damp for an extended period of time......adds to the character I guess!  ;D

http://www.youtube.com/watch?v=U0ZtuQJ5v6k

Sanjay F:

--- Quote from: crueby on September 10, 2025, 03:51:07 PM ---Rusty, but a nice looking engine overall. That one-piece steam chest was used on a lot of full sized engines, but fell out of favor for models since it is very hard to get a good finish on the valve face down inside the chest. How many more of these old engines are waiting in the wings? Neat engines!

--- End quote ---

I wondered why they changed it to a separate valve chest, that makes sense now.

I have a backlog of engines which built up in 2024 when my house and workshop were being refurb'd; I got a little trigger happy on auctions out of boredom  ;)

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