What the Libra zodiac sign is all about: Libra is the seventh of the 12 zodiac signs, which begins its cycle in early fall every year during Libra seasonâwhich falls around September 23-October 22.
How it works. This schematic shows the component parts of a typical leak-down tester. The gauge on the right is held at a standard pressure by adjusting the pressure regulator while the gauge on the left shows an example reading of 85-or 15% leakage.
The less air leakage the better. Aircraft mechanics have used this test for a long time. The drill is this. Set the engine at Top-Dead-Center and attach the leak down tester hose to the sparkplug hole. Lock the crankshaft in place. The tester is attached to an air supply and set at 100 psi (Pounds per square inch). You then connect the tester to the tester hose and read how much air is leaking out of the cylinder.