Glossary “unleaded fuel” Definition:
Fuel that does not contain tetraethyl lead.
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unleaded gasoline
Glossary “unleaded gasoline” Definition:
Gasoline that contains less than 0.0018 ounces (0.05 grams) of lead per gallon (3.785 liters).
unlined clutches
Glossary “unlined clutches” Definition:
Steel clutches which feature no lining. See clutches.
universal flexible hose
Glossary “universal flexible hose” Definition:
Flexible radiator hose.
universal joint
Glossary “universal joint” Definition:
Joint connection in the drive line that permits the driving angle to change. Also known as U-joint.
unitized distributor
Glossary “unitized distributor” Definition:
Electronic ignition system, magnetic-pulse distributor, that combines the distributor, electronic module, pickup coil, cap, and coil into one compact assembly.
universal blender (PPG-830)
Glossary “universal blender (PPG-830)” Definition:
A custom blend of solvents that allows for use in all types of shops and conditions and with various products.
unitized construction
Glossary “unitized construction” Definition:
Type of vehicle construction whereby the frame and body parts are welded together to form a single assembly.
unit distributor
Glossary “unit distributor” Definition:
Breakerless ignition distributor used by General Motors containing the ignition coil, magnetic pickup coil, and timer core.
United States Auto Club (USAC)
Glossary “United States Auto Club (USAC)” Definition:
A sanctioning body for oval-track racing, such as the Indianapolis 500.
United States Customary System (USC measurements, USCS)
Glossary “United States Customary System (USC measurements, USCS)” Definition:
The type of measuring system used in the United States, such as gallon, inch, mile, and pounds.
union
Glossary “union” Definition:
Connection that joins two pieces of tubing together, often used on vacuum or air pressure lines.
unit
Glossary “unit” Definition:
Assembly or device that can perform its function without outside interference or assistance.
unit body
Glossary “unit body” Definition:
Form of vehicle construction that includes the chassis, frame, and body in one unit.
unit cable
Glossary “unit cable” Definition:
Cable having pairs of cables placed into groups (units) of a given quantity, then these groups form the core.
uniform tire quality grading
Glossary “uniform tire quality grading” Definition:
Information required by the DOT to be molded into the sidewall of each tire to provide information relating to tread wear, traction, and temperature ratings.
unidirectional glass cloth
Glossary “unidirectional glass cloth” Definition:
Fiberglass cloth with the fibers running mostly in one direction.
unidirectional rotor
Glossary “unidirectional rotor” Definition:
Rotors with cooling fins that are curved or formed at a angle to the hub center to increase cooling airflow. Because the fins only work properly when the rotor turns in one direction, unidirectional rotors cannot be interchanged from right to left .
unidirectional tread pattern
Glossary “unidirectional tread pattern” Definition:
Tire tread pattern that can be rotated only in one direction. Thus left to right rotation cannot be done.
uniform pitch spring
Glossary “uniform pitch spring” Definition:
A valve spring having uniformly spaced coils.