The vertical axis around which a vehicle structure's front and rear ends swing back and forth.
Zap
To defeat an opponent.
To over rev an engine to the extent that it is damaged.
Zener Diode
A diode often used in electronic voltage regulators.
Zerk
A term used for zerk fitting.
Zerk Fitting
A nipple-like lubrication fitting through which grease is applied to a chassis or suspension joint with a grease gun.
Zero Emissions
A system or device that does not emit exhaust pollutants to the atmosphere.
Zero Lash
No clearance between the valve lifter and camshaft lobe.
Zero Toe
Adjusting the wheels so they point straight ahead.
Zero-Emissions Vehicle (ZEV)
An electric vehicle.
Zero-Gap Ring
A piston ring that does not have end clearance.
ZEV
An abbreviation for zero-emissions vehicle.
Zinc Inner Liner
A thin zinc-metal leaf between the longer steel leaves of a leaf- spring suspension system to control sliding friction between the leaves, and prevent corrosion on certain models.
Zing
To unintentionally over rev an engine.
Zirc Fitting
A zerk fitting made of zirconium alloy.
Zoomies
Exhaust headers that sweep back and up toward the top of the rear tires on an open-wheeled drag racer.
Zyglow
A non-destructive system using a dye penetrant and an ultraviolet light to check non-magnetic parts for faults and cracks.
Please note that the definitions included in this Auto Glossary reflect the manner in which these terms are used on the Duipee.com website, which in some instances may differ from their meaning in other contexts.