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Post by johnharkness on May 10, 2006 20:19:21 GMT
I have a leaking Regulator Flange plate on the backplate where the regulator handle fits the lococmotive is a 'Doris' Black Five.
The problem is it is built to LBSC plans so the boiler backplate isn't bushed the flange is screwed straight onto the backplate by four 4mm stainless screws. I have tried Hylamor and a gasket but it still blows through. any suggestions please.
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Post by Tel on May 10, 2006 21:25:05 GMT
re-do it with 8 screws?
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Post by GWRdriver on May 10, 2006 21:41:48 GMT
This is unfortunate, and it would be tempting to wheeze on about my lack of admiration for the designer, ;D but that would serve no good purpose. I have found it next to impossible to create a lasting seal against steam pressure in such situations where the mating surfaces cannot be drawn tightly together, no matter what kind of goop I put in the seam.
If you are equipped to make a new regulator flange, and there is a bit of throttle rod length to spare proud of the flange, I may have a solution using an 2mm or 2.5mm x 25mm O-ring. It will be touch & go but if it works you are unlikely to be bothered by chronic leaks at that location again (if so just replace the O-ring . . . but I can't predict the behavior of those screws in copper) and if it doesn't work you'll be no worse off than you are now.
Could you post some dimensions, OR even better direct me to the MEs where the construction drawings can be found I can tell you in a moment if my idea will work. It will mostly be a matter of available clearances.
Never mind! . . . I have just now found it on my own, Vols 98-101, and the first page I turned to had the footplate elevation. It appears the flange is 7/8" in diameter with the screws at a 5/8" or perhaps a bit larger PCD. The nearest obstruction appears to be a pair of stay ends at about .125"-.150" clear of the edge of the flange. Am I close so far? I also need to know the thickness of the flange on your loco.
See if a new flange of 1.125" diameter can be fitted into the available space. By my calculations it's going to take that to do the job.
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Post by johnharkness on May 20, 2006 9:03:58 GMT
Hello there, think I have found the solution 'PERMABOND' has been steamed up to full pressure four times and out on the club track twice and up to now not a leak. John.
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