Under pressure.
Had to clean stuck safety release valve on an A3 so now I can raise steam.
Finding the loco is slightly underpowered. How can I increase the pressure at the valve?
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Take the cap off (little screw at the side) the relief valve and use a 2 pronged tool to turn the insert clockwise. This increases the pressure on the spring beneath it, which in turn makes the valve harder to lift, thus increasing pressure.
Do it in quarter turns. DO NOT over tighten.