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.
Cylinder Leakage Test. A cylinder leak test is usually performed after a cylinder pressure test has indicated a problem. The cylinder is placed on top dead center of the desired cylinder and the spark plug is removed on that cylinder only. This is because when air pressure is introduced into the cylinder the piston will travel downward.