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Office of Steam Forum for Model &amp
;amp;amp;amp;amp;amp; Toy Steam Gas &amp
;amp;amp;amp;amp;amp;amp; Hot Air Engines
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(DIR) Return to: Restorations
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#Post#: 13437--------------------------------------------------
Stuart S50 ressurection
By: Steam Technology Date: August 13, 2019, 9:36 pm
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Resurecting an S50 from parts of various engines
[attachimg=1]
There is damage to the cylinder and mods to both covers as well
as heap of stuff to fabricate.
[attachimg=2]
Plenty to be going on with then!!
#Post#: 13446--------------------------------------------------
Re: Stuart S50 ressurection
By: Scorpion2nz Date: August 14, 2019, 12:34 am
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I think I have seen them before .
They look familiar
Cheers
Dennis
#Post#: 13473--------------------------------------------------
Re: Stuart S50 ressurection
By: Steam Technology Date: August 14, 2019, 5:32 pm
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I have repaired the cylinder and I have drilled out the sheared
off studs
[attachimg=1]
This is an early bronze cylinder and the threaded holes are
3/32bsw which I will be converting to 7BA.
Piston rod & piston have been made
[attachimg=2]
The crosshead pivot was seized with rust & gunk so I dismantled.
cleaned & reassembled it.
Then a temporary trial fit to make sure every lined up and
turned over smoothly.
[attachimg=3]
There is an alignment issue with the cylinder mounting holes and
the base due to these not being from the same engine but I will
deal with that at a later date.
#Post#: 13476--------------------------------------------------
Re: Stuart S50 ressurection
By: Jim Date: August 14, 2019, 6:03 pm
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Watching with interest this resto.
#Post#: 13480--------------------------------------------------
Re: Stuart S50 ressurection
By: Hero Date: August 14, 2019, 6:24 pm
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These are nice engines. I'll be watching carefully, and hope
that it all works out well for you.
#Post#: 13491--------------------------------------------------
Re: Stuart S50 ressurection
By: Steam Technology Date: August 14, 2019, 11:53 pm
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The rear cylinder cover had been modified by a previous owner so
I converted it into a front cover and will make a new rear
cover.
[attachimg=1]
Dismantled it then fabricated the new parts as required
[attachimg=2]
Then a quick assembly just to check.
[attachimg=3]
Also made the packing gland for thr valve chest while I was at
it.
#Post#: 13495--------------------------------------------------
Re: Stuart S50 ressurection
By: Steam Technology Date: August 15, 2019, 3:44 am
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Made the valve rod, valve and nut.
[attachimg=1]
Then on to the eccentric rod. I dismantled the engine so I could
get the eccentric off to ensure the profile of the brass
retaimer/follower was correct.
[attachimg=2]
I cleaned all parts before reassembly.
Then I turned the rod from 8mm bar which gave me the size at the
end needed for the pivot.
Made the pivot block next.
[attachimg=3]
Then a trial fit up to set the lengths and sizes etc.
[attachimg=4]
With everything looking good all covers were fitted.
[attachimg=5]
Then curiosity got the better of me and I gave it a trial run on
air. A short, rather poor quality video follows.
(HTM) https://youtu.be/gsPogZ3Yhaw
I have exhaust3d my current supply of 7BA bolts so there are
heaps of air leaks. Also as I have not decided whether to go
with o ri gs ,oil grooves or packing, the piston is still a
block so there will be blowby.
And I am not wholly comvinced that the timing is right despite
the detent for the eccentric lock screw.
Anyhoo it works and there is a lot of fettling, fiddling, and
finessing still to do.
#Post#: 13528--------------------------------------------------
Re: Stuart S50 ressurection
By: Dr.Rev.DelmarMacReady Date: August 15, 2019, 7:35 pm
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Coming along nicely. Great fun to watch your resto
#Post#: 13533--------------------------------------------------
Re: Stuart S50 ressurection
By: Scorpion2nz Date: August 16, 2019, 12:54 am
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Great to see you have life in it .
Well done on resurrecting the reject parts from here .
Cheers
Dennis
#Post#: 13558--------------------------------------------------
Re: Stuart S50 ressurection
By: Swift Fox Date: August 16, 2019, 9:09 am
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Nice to see it back together and running, great that it has the
bronze cylinder and valve chest.
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