tmuir
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Steam tight? You Bet!I was just walking past my Luton Bowman and out of impulse spun the fly wheel and to my amazement it made the whistle sound as I had left it in the open position.
I then closed the whistle and spung the fly wheel several times meeting greater resistance each revolution.
After waiting 10 or so seconds I opened the whistle and the pressure I had built up in the boiler made the whistle sound for a couple of seconds.
I guess I can safely say my Luton Bowman does not have any leaks.
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MTA
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 yes, very steam tight if only all engines were like that 
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Mamodman123
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All my SE3's can build up a little pressure to make the whistle sound  as long as you replace all seals then engines will run sweet 
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Dauntless
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yes my N&B TE1 is like that,
as is the mastrand, "i think" difficult to tell with undoing the safety valve to hear the "hiss"
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Wallace
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First thing I do when I get an engine is cover safety valve hole with finger, spin flywheel in reverse, then release finger, to see if pressure comes out.
My SE2a will actually kick flywheel over a couple of turns if i spin the flywheel in reverse for a bit, then let go
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