The force that is exerted on a vehicle during acceleration, deceleration, or cornering, expressed in units of gravity (g's).
G.I. Spacer
A device used to space out a piston ring in a piston groove that has been intentionally machined oversize because of wear.
A less popular way of spelling gauge.
An element used to contain and space the rollers in a one-way roller clutch.
A passageway inside a wall or casing, such as for oil circulation.
The friction-induced roughness of two metal surfaces in direct sliding contact.
The welding up and tearing down of metals due to extreme high temperature and/or inadequate lubrication.
Galloping Hinge
A connecting rod.
Galvanic Action
The action of electropositive and electronegative metals due to the wasting away of the positive metal. This is most noted when iron (Fe) and brass, copper (Cu), or copper (Cu) and zinc (Zn), are in contact in the presence of acid-diluted water.
Galvanic Reaction
An electrical reaction caused by heat and water passing through metal pipes or parts at high speeds.
An electromechanical process of coating zinc (Zn) to ferrous metals to reduce or prevent rust.
An instrument used for measuring a small electrical current.
The space between two adjacent parts or surfaces.
A vapor.
A short term for gasoline.
Gas Bypass Line
A term used for hot-gas bypass line.
Gas Bypass Valve
A term used for hot-gas bypass valve.
Gas Cylinder
A container used for the transportation and storage of compressed gas.
Gas Defrosting
The use of hot, high-pressure gas in the evaporator to remove frost or ice buildup.
Gas Guzzler
A vehicle having excessive fuel consumption.
Gas Hog
A term often used for gas guzzler.
Gas Ports
A series of holes drilled from the crown of a piston to the top ring groove, providing combustion pressure to force the ring against the cylinder wall, ensuring a more effective seal.
Gas Regulator
A device used to control the delivery of gas at a substantially constant pressure.
Gas Shock
A term used for gas-filled shock absorber.
Gas-Filled Shock Absorber
A shock that uses nitrogen gas, at 25 times atmospheric pressure, to pressurize the fluid in the shock to reduce or prevent aeration or foaming. Also known as gas shock.
Gas-Metal Arc Cutting (GMAC)
An arc-cutting process that uses a continuous, consumable electrode and a shielding gas.
Gas-Metal Arc Welding (GMAW)
An arc-welding process that uses an arc between a continuous-filler metal electrode and the weld pool.
Gas-Transfer Velocity
The speed at which the air-fuel mixture spreads out in the combustion chamber during the power phase.
Gas-Tungsten Arc Cutting (GTAC)
An arc-cutting process that uses a single tungsten electrode with gas shielding.
Gas-Tungsten Zrc Welding (GTAW)
An arc-welding process that uses an arc between a non-consumable tungsten electrode and the weld pool.
Gas-Turbine Engine
An internal-combustion engine in which the shaft is spun by combustion gases flowing against curved turbine blades located around the shaft.
Gasifier Section
The part of a gas-turbine engine that draws in air, mixes it with fuel, and burns the mixture.
A metal ring used on some spark plugs to seal pressure between the plug shell and the cylinder head.
A piece of thin compressible material such as cork, rubber, or soft metal, placed between two mating surfaces to form a seal.
Gasket Cement
A liquid gel or paste adhesive material used to bond gaskets to their mating surfaces.
Gasket Shellac
A liquid form of gasket cement.
A mixture of 85–90% gasoline and 10–15% alcohol, usually ethanol.
A liquid blend of hydrocarbons used as automotive fuel and processed from crude oil.
Gasoline Alley
The infield-garage area at the Indianapolis speedway.
Gasoline Consumption
A term used for fuel consumption.
Gasoline Container
Specially approved OSHA containers used to safely hold and store gasoline.
The conversion of battery water into hydrogen and oxygen, and oxygen gas.
The money that is collected for admission.
The starting position for a drag race.
To take the lead in a drag race right from the start.
An instrument used for measuring, such as for compression.
A dashboard-mounted component used for visual indication of engine and system conditions, such as oil pressure.
Gauge Pressure
A pressure indicated on a scale with atmospheric pressure as 0 psi or kPa.
Gauge Set
Two or more instruments attached to a manifold and used for measuring or testing pressure.
Two or more instruments used to indicate engine and system conditions, such as oil pressure, coolant temperature, and charging-system indicators.
Gauging Point
The starting point for measuring a part.
An abbreviation for gross-axle weight rating.
An abbreviation for gross combined weight.
A cogged device that mates or meshes with another.
Gear Backlash
The measurable gap or slack between gears.
Gear Carton
A transmission housing.
Gear Drive
A system of two or more gears, such as one that transmits power from the crankshaft or camshaft.
Gear Lubricant
A type of oil or grease especially formulated to lubricate gears.
Gear Oil
A thick lubricant, generally with an SAE number of 80 or above, used in standard transmissions or differentials. These often contain additives, such as an EP additive, to guard against being squeezed out from between gear teeth.
Gear Oil, Limited-Slip
A lubricant specified for use in certain limited-slip differentials to prevent chattering during turns and/or abnormal wear to the parts.
Gear Pitch
The number of teeth in a given unit of pitch diameter.
Gear Ratio
The speed relationship that exists between a driving (input) and a driven (output) gear. For example, a driving gear that revolves twice for each driven-gear revolution has a 2 to 1 (2:1) ratio.
Gear Rotor Pump
A type of pump that uses sun gears to move liquid.
Gear Shift
A floor- or steering-wheel-mounted lever used to manually change gears in the transmission.
A linkage-type mechanism by which the gears in a transmission are engaged.
Gear Whine
A high-pitched sound developed by some types of meshing gears.
Gear-Type Pump
A pump that uses two rotating gears to draw in fluid that is carried around the outer pump body in cavities between gear teeth and dispensed under pressure as the gear teeth mesh together.
Geared Speed
A theoretical vehicle speed based on engine rpm, transmission-gear ratio, rear-axle ratio, and tire size, not accounting for slippage.
Mechanical devices containing teeth that mesh that transmit power, or turning force, from one shaft to another.
Gel Coat
The first layer that is applied to a female mold for a fiberglass layup, before the mat or cloth layers.
GEN III System
A fuel and engine ignition-management system developed in the late 1980s by General Motors.
General Engine Specifications
Specifications that are used to identify a particular style and type of engine.
General Over-the-Road Use
A fifth wheel truck designed for pulling multiple standard duty highway equipment such as trailers, flat beds, tankers, and so on.
General Purpose (GP)
A military designation during World War II, for the Willys 4*4; later known as a Jeep.
An ac or dc electrical-generating device that converts mechanical energy to electrical energy.
A term used for gear rotor pump.
Get Off It
To release the accelerator and slow down. Also known as get out of it.
Get Out of It
To release the accelerator and slow down. Also known as get off it.
Get with the Program
To perform a task properly.
To spin out on a dirt track.
Gilmer Belt Drive
An accessory drive system using a cogged belt to ensure positive engagement, such as with a supercharger.
Nonfunctioning visual ornamentation, such as chrome.
A heavy-duty, main-bearing support for a racing engine.
Connectors between tractor and trailer air lines.
A term used for fiberglass-reinforced plastic.
A hard, brittle, transparent substance composed of silicates mixed with potash or suds and lime; used for windows in a vehicle.
Glass Beader
An apparatus for using air-propelled glass beads to clean parts.
Glass Wrapped
A term used to refer to a vehicle with a fiberglass body.
Glass-Bead Cleaning
The cleaning of parts and panels using glass beads propelled with the use of compressed air.
Glass-Bead Test
A method of determining the absolute rating of a filter and its efficiency by introducing a measured quantity of glass beads of varying, but known, diameter, as a contaminant into the fluid, which is then filtered through the element.
A smooth, glossy surface.
A very glossy, thin, smooth surface.
An appearance characteristic that gives the perception of the brightness and luster of a smooth, polished surface.
Glove Box
A small, enclosed storage area in the front passenger compartment of a vehicle.
Glove Compartment
A term used for glove box.
Glow Plug
An electrical plug used to preheat the combustion chamber to aid in starting a cold diesel engine.
A term used for ethylene glycol.
A specific brand of Class F insulating enamel.
An abbreviation for gas-metal arc cutting.
An abbreviation for gas-metal arc welding.
GMC Supercharger
A positive displacement, mechanically-driven blower developed by General Motors for two-stroke, diesel-truck engines later adapted for gasoline racing engines.
An abbreviation for Grand National.
Go Button
The accelerator.
Go Kart
A term for a specific brand of racing kart, often used as a generic term for any kart.
A term used to identify a Pontiac GTO.
To run extremely fast.
Go for.
A person who runs errands.
A trophy.
Prizes and awards for race-car winners or show-car participants.
High performance equipment on an engine.
Goosed Moose
A car having a severe forward rake.
Gourd Guard
A helmet.
A device that controls another device, usually on the basis of speed or rpm.2. A speed-sensitive mechanical assembly in the automatic transmission driven by the output shaft, to supply primary control of when shifting is to occur.
Governor Assembly
A vehicle speed-sensing device that produces governor pressure to force the transmission upshift and permit the downshift.
Governor Pressure
The transmission's hydraulic pressure, used to control shift points, which is directly related to output shaft speed.
Governor Valve
A device attached to the output shaft and used to sense vehicle speed.
Gow Job
A term used in the early 1940s to identify a hot rod. Also gow wagon.
Gow Out
To accelerate quickly in a gow job.
Gow Wagon
A term used in the early 1940s to identify a hot rod. Also gow job.
An abbreviation for general purpose.
An abbreviation for Grand Prix.
An abbreviation for gallons per hour.
An abbreviation for gallons per minute.
A hill; generally a steep hill.
Sort by size or quality.
Grade Labeling
Tire ratings that may be used as a guide in buying, enabling the buyer to compare, at a glance, the apparent value of one tire with that of another.
The ability of a truck to negotiate a given grade at a specified GCW or GVW.
A measurement of the amount of exhaust emissions a vehicle produces.
Gran Turismo (GT)
Italian for grand touring.
Gran Turismo Omologato (GTO)
Italian term for GT cars that have been qualified for racing as a production vehicle.
Grand National
A premier series of NASCAR stock car races.
Grand Prix (GP)
A French term that means grand prize.
An international series of Formula One racing events.
The 24-hour race at LeMans.
An annual USAC midget-car race once held on Thanksgiving in Southern California.
Grand Touring
A sports coupe with enclosed, rather than open, bodywork.
Granny Gear
The combination of low gear in the transmission and low range in the transfer case.
Any computer-generated image or illustration produced on a screen, paper, or film.
A crystalline form of carbon (C) found in natural deposits or formed by heating black carbon (C).
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.
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.
A color.
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.
The upper part of a vehicle body, including the windows, pillars, and roof.
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.
A wire mesh, such as that used for a grille.
The starting position of race cars based on their qualifying order.
Grid Growth
A condition where the battery grid grows little metallic fingers, extending through the separators, shorting out the plates.
An ornamental opening in the front of a vehicle through which air is delivered to the radiator.
To use an abrasive wheel to remove metal.
The specific contour of a camshaft lobe, such as a quarter-race grind.
A long race with emphasis on endurance rather than performance.
A term used for traction.
Fine dust or dirt.
Grocery Getter
A car used for everyday transportation.
A reinforced-metal eyelet through which a fastener is attached.
A rubber or plastic eyelet inserted in a hole to protect wires that pass through it.
The recess in a part to hold a ring or snap ring.
Space between two adjacent tread ribs or lugs; the lowered section of the tire tread.
The specific path through a turn in an oval track or in road racing.
A rut.
Groove Weld
A weld made in a groove between the work pieces.
Gross Axle-Weight Rating (GAWR)
The maximum allowable fully loaded weight of a given axle.
Gross Combination Weight (GCW)
The total weight of a fully equipped vehicle including payload, fuel, and driver.
Gross Horsepower
The maximum engine output as measured on a dynamometer. Also known as gross torque.
Gross Torque
A term used for gross horsepower.
Gross Trailer Weight (GTW)
The sum of the weight of the trailer(s) and the payload.
Gross Valve Lift
The valve lift, including the running-valve clearance.
Gross Vehicle-Weight Rating (GVWR)
The maximum that a vehicle should weigh when fully loaded with all passengers, fuel, and cargo.
A large conducting body, such as the Earth, used as a common return for an electric circuit.
The metal part of the vehicle structure in a single-wire system.
A term sometimes used for short circuit.
Ground Effect
The reduced air pressure under a vehicle that allows the normal pressure above the vehicle to push the vehicle downward, providing a better grip on the road surface.
Ground Electrode
A part of the lower end of the spark-plug shell making up the electrode gap, providing a path for current flow while jumping the gap.
Ground Wave
An electromagnetic wave that travels along the Earth's surface; usually emitted by a radio transmitter.
Ground-End Spring
A spring that has flattened ends, usually by grinding, to better fit the perches or retainers.
Ground-return System
A common system of electrical wiring whereby the chassis or frame serves as a part of the electrical circuit.
Connected to Earth or to some conducting body that serves in place of the Earth.
Grounded Circuit
A condition that allows current to return to ground before it has reached the intended load component.
The connecting of an electrical unit to the vehicle frame to provide a complete path for electrical current.
Group Injection
A method of injecting fuel into the manifold areas of several cylinders of an electronic fuel-injection system while at the same time, actually entering each cylinder as its intake valve is opened.
One, especially a female, who follows the racing circuits hoping to be accepted by its members.
An abbreviation for gran turismo, Italian for grand touring.
An abbreviation for gas-tungsten arc cutting.
An abbreviation for gas-tungsten arc welding.
An abbreviation for gran turisimo omologato.
An abbreviation for gross trailer weight.
A barrier, such as a shroud, that physically prevents entry of the operator's hands or fingers into the point of operation.
A part used to align an assembly or another part.
The support for a valve stem in the head.
Guide Block
A metal or hard-rubber device used to maintain timing-chain tension.
Guide Insert
A valve-guide insert that is not an original part of the cylinder head; used to replace a worn integral valve guide.
Guide Liner
A thin, bronze sleeve used to repair a worn-out valve guide.
Guide Plate
A metal plate on the cylinder head that keeps the push rod aligned with the rocker arm.
Guide Rail
A device that keeps the timing chain aligned and in the correct position.
Guide Seal
A seal that prevents oil from being drawn into the valve guide.
Guide Shoe
A device used to maintain tension on the timing chain of an overhead-cam engine.
Guide Sleeve
A tubular sleeve that is placed on a connecting rod bolt when it is removed, to prevent the bolt threads from scratching the crank pin.
An electronic headlamp control that automatically shifts between upper and lower beams as required.
Guide-Mounted Seal
A seal that mounts directly onto the valve guide.
A coupe-body style with the doors hinged so they open upward.
Gulp Valve
A valve that opens in an air-injection system to admit extra air into the intake manifold upon deceleration, thus leaning out the mixture to prevent backfiring.
Residue that remains when gasoline is allowed to sit for a period of time.
Drag racing tires made of especially soft, sticky compound.
The rotating light in a hemispherical housing on top of a police car or emergency vehicle.
Gun It
To rev up an engine suddenly.
Gun-Drilled Oil Holes
Holes that are drilled to allow oil to be fed to the piston pin.
Gurgle Method
A method of adding refrigerant from small cans to a system without running the engine.
A triangular piece of metal used to add strength to a corner.
To remove non-functional parts of a vehicle in order to reduce its weight.
The internal structure of a vehicle.
The essential working parts of a device.
An abbreviation for gross vehicle-weight rating.
An individually clocked maneuverability contest for sports cars over an extremely tight course.® ©2001- 2020  AutoZone, Inc. All Rights Reserved.