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.
A PCV valve can also stick in a closed position. This allows crankcase pressure and blow-by to build pressure and can damage gaskets and seals. Technicians also test back pressure with a manometer. Positive pressure in the crankcase is a sign of a problem. PCV valve can also stick in a closed position. This allows crankcase pressure and blow-by to build pressure and can damage gaskets and seals. Technicians also test back pressure with a manometer. Positive pressure in the crankcase is a sign of a problem.