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Graphite

A crystalline form of carbon (c) found in natural deposits or formed by eating black carbon (C).

Graticule

The grid lines on a screen for measuring oscilloscope traces patterns or waveforms.

Gravity Bleeding

A method of purging air from a system by allowing the fluid to force air out of an opened bleeder valve by its own weight.

Gravity Casting

A process that relies on gravity to pull the material to the bottom of the mold during casting.

Gravity Energized

A one-way roller clutch that has no mechanical means for holding the roller in contact with the cam and race.

Gray Market

The individual importing of a foreign car into the United States.

Gray Water

Used wash water from the kitchen and bathroom of a mobile home or recreational vehicle.

Gray-market Parts

Any part that is not covered by a manufacturer's warranty, generally because it was not sold through an authorized dealer.

Grease

Lubricant consisting of a stable mixture of oil, soap thickeners (usually lithium, sodium, or calcium), and other ingredients for the desired physical or operating characteristics.

Grease Fitting

The orifice, having a check valve, that a grease gun fits on during the greasing process.

Grease Plug

A small plug in a lubrication hole where there is a danger of over lubrication by high-pressure equipment. It is removed for lubrication and then reinstalled.

Greasy Friction

The friction between two surfaces coated with a thin layer of oil.

Green

1. Aq color. 2. A term used for green flag.

Green Flag

The flag used to signal the start of a race.

Green Goo

A term used for green Loctite.

Green Loctite

A high-temperature anaerobic compound used for securing parts together.

Greenhouse

The upper part of a vehicle body, including the windows, pillars, and roof.

Greenhouse Effect

A greenhouse is warmed because glass allows the sun's radiant heat to enter but prevents radiant heat from leaving. Global warming is caused by some gases in the atmosphere that like greenhouse glass, hence, the term greenhouse effect.

Grenade Motor

An engine that is expected to deliver a very high horsepower for a short time, before it blows up.

Grenaded Motor

An engine that has blown up.