FAT3 Glossary

A small donut-shaped rubber ring used to seal connections between air-conditioning components.

Seals that are a complete circle. If a cutaway is done, it will also be a complete circle. These seals are usually set into a groove that is machined into the housing or part that does not move and is intended to be sealed.

Seals used where the valve spring retainer attaches to the valve stem to seal the juncture and prevent excessive oil from leaking into the valve guide.

The first generation of on-board diagnostic systems, which originated for California vehicles.

The second generation of on-board diagnostic systems, which have been in effect for all U.S. vehicles since 1996.

The agency that ensures safe and healthy working conditions by setting and enforcing standards and by providing training, outreach, education, and assistance.

A standard measure of the performance of a motor or aviation fuel. The higher the number, the more heat the fuel can withstand before self-igniting.

An agent with a strong, unpleasant smell that is mixed with odorless compounds to make them detectable. Mercaptan, which smells like sulfur, is added to natural gas and propane so that leaks can be detected.

A tool used to machine (refinish) drums and rotors after they have been removed from the vehicle.

A screwdriver with a 90-degree bend in the shaft for working in tight spaces.