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GWR Small Prairie 5inch model

Regulator seized

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Stephen Lawson22/12/2011 13:59:13
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The Liskeard Model Society have taken on the task of refurbishing a 5 inch gauge GWR 45 class (Small Prairie). Several problems have been solved but one which we are would like some advice on concerns the regulator. It appears to be seized. There is no steam dome as such but the regulator looks to be fitted in the smoke box. Are we right ? How should we go about accessing it ? Is it necessary to remove the superheaters ? Any communication would be appreciated. Regards Steve Lawson
John Baguley22/12/2011 14:30:48
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Hi Steve,
 
Is it Firefly to the Martin Evan's design? If so, the regulator is a simple internal screw down type fitted from the backhead. To remove though you will have to remove the superheaters and the header bush that screws into the front tube plate - the steam pipe from the regulator also screws into this, hence the need to remove it. Have you tried steaming the loco yet? Screw down regulators are notorius for locking up if you let the boiler go cold without opening it slightly. It may free up again when the boiler is hot.
 
John
Stephen Lawson22/12/2011 17:02:26
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Many thanks for your reply John. Yes, we think it is Firefly to the Martin Evan's design. Personally, I am not familiar with "simple internal screw-down" regulator. If anyone is able to supply further info or a reference to location of info I would be very grateful. Drawings would be great but expensive to purchase.
We have not tried to steam the engine yet, just trying to sort out the obvious problems first. However John, on your recomendation, it would appear the thing to do. Watch this space !
 
Thanks again
 
Steve
John Baguley22/12/2011 17:44:12
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517 forum posts
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Hi Steve,
 
have sent you a pm.
 
John
Stephen Lawson22/12/2011 23:36:00
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Please excuse my ignorance John - PM?
John Baguley22/12/2011 23:46:28
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517 forum posts
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Hi Steve,
 
'personal message' . When you log on, look in 'My Messages'

John
Stephen Lawson22/12/2011 23:51:33
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14 forum posts
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Figured it out -"eventually"
Stephen Lawson23/12/2011 10:21:02
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For info - John has sent me a copy of article printed in ME dated February 1962. By Martin Evans, the article describes the construction of 5" Firefly in great detail including working drawings.
After mentioning my difficulty to a neighbour, also named John, he came up with a book "Manual of Model Steam Locomotive Construction" by Martin Evans.
My cup runneth over !
 
Many thanks John & John

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