barry1946
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using air to test boilers and test run enginesI saw this topic on the end of MMs soldering thread and I thought as a topic it deserved a thread of its own!
It concerns the use of air to test boilers for leaks, or to test run engines.
  
I turned and tapped some hex bar to replace the sv, used a bit of plastic tubing to connect to another piece of brass bar that fits the end of the 12v electric car tyre pump. Works well and is straight forward.
A final thought in this safety sensitive climate! I think we should bear in mind the safety aspect and use common sense as to the supply of air. The pump I use provides just enough puff to do the job without presenting too much of a safety issue. Anything more powerful will increase risk!  (Sorry Grannie - I do know you can suck eggs).
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Mamodman123
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Should have used it in the whsitle thread and left the safety valve in, but I'm not going to tell you off 
That is pretty much how to test a boiler anyway! 
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Darren
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Now that's what I like to see, a practical solution to a realistic problem.
I'm guessing the Mk II could have a pressure gauge in there some where to get a better understand of what actual pressure was in the boiler.
You could then think about getting an uprated safety valve made, to 'crack' open at say 20 to 30 PSI. That way, you could test the boiler past it's normal operating limits but protect it from accidental 'test' over pressue (just remember to remove it when you fire your engine  ).
So where can I buy one from ?
Darren.
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barry1946
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Oops MM - I should have used an SE1 for my pic! 
Adding a gauge etc. is a good idea but its going to get complicated!
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Lewis
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My se1
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barry1946
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That very true! I happen to know that your is a spectacularly good example of an SE1!
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Lewis
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So true
laquer a bit burnt now but if need be i can polish it of not going to fire it now for a while because i want to keep it in the best condition 
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