Glossary “gray market parts” Definition:
Any part that is not covered by a manufacturer’s warranty, generally because it was not sold through an authorized dealer.
g
gravity casting
Glossary “gravity casting” Definition:
Process that relies on gravity to pull the material to the bottom of the mold during casting.
gravity energized
Glossary “gravity energized” Definition:
A one-way roller clutch that has no mechanical means for holding the roller in contact with the cam and race.
gravity feed spray gun
Glossary “gravity feed spray gun” Definition:
Cup mounted on top of the spray gun so that the material flows down without external air pressure.
gran turismo (GT)
Glossary “gran turismo (GT)” Definition:
Italian for “grand touring.”
granny gear
Glossary “granny gear” Definition:
Lowest gear in the transmission.
graphite
Glossary “graphite” Definition:
A crystalline form of carbon (c) found in natural deposits or formed by heating black carbon (C).
graticule
Glossary “graticule” Definition:
The grid lines on a screen for measuring oscilloscope traces patterns or waveforms
gravity bleeding
Glossary “gravity bleeding” Definition:
Method of purging air from a system by allowing the fluid to force air out of an opened bleeder valve by its own weight.
gram
Glossary “gram” Definition:
Metric unit of weight measurement equal to 1/1000 kilogram ( 28 grams = 1 oz). A dollar bill or paper clip weighs about 1 gram.
grams
Glossary “grams” Definition:
A unit of mass measurement. Unit of infered air flow (grams per second).
grams-per-mile
Glossary “grams-per-mile” Definition:
Measurement of the amount of exhaust emissions a vehicle produces.
graduated pail
Glossary “graduated pail” Definition:
Used to measure liquid materails when mixing.
grain structure
Glossary “grain structure” Definition:
In a piece of steel, it determines how much it can be bent or shaped.
gradeability
Glossary “gradeability” Definition:
Ability of a truck to negotiate a given grade at a specified GCW or GVW.
grabbing clutch
Glossary “grabbing clutch” Definition:
When the friction disc does not slip normally, but grabs all at once.
grade
Glossary “grade” Definition:
1). A hill; generally a step hill. 2). Sort by size or quality.
grade labeling
Glossary “grade labeling” Definition:
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.
grade retard
Glossary “grade retard” Definition:
Band or clutch which is applied as the vehicle decelerates, in order to assist in braking.
GPT
Glossary “GPT” Definition:
General Purpose Thermoplastic