Glossary “rigid discs” Definition:
Steel plates to which friction linings or facings are bonded or riveted.
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rigid motor mount
Glossary “rigid motor mount” Definition:
Solid mount for attaching the motor to the frame without any provisions for vibration dampening.
rigid rear driving axle
Glossary “rigid rear driving axle” Definition:
Common rear suspension system design constructed of a central differential and tubular axle shaft housing.
rigid axle
Glossary “rigid axle” Definition:
Term used for beam axle or solid axle.
Right-To-Know-Law
Glossary “Right-To-Know-Law” Definition:
A federal law that requires all manufacturers of hazardous materials to notify and make information available to all employees, vendors, customers, and end users relative to the nature of the hazard, and to provide remedies if accidently misused.
ride height
Glossary “ride height” Definition:
Distance between the road surface and the bottom of a vehicle at specific points.
ridge
Glossary “ridge” Definition:
Condition in the bores of an engine caused by piston-ring wear of the cylinder walls at the top of the cylinder.
riding the clutch
Glossary “riding the clutch” Definition:
Rest a foot on the clutch pedal when driving.
right-hand thread
Glossary “right-hand thread” Definition:
A common thread for a bolt or nut that is tightened by turning it clockwise, or to the right.
rich A/F mixture
Glossary “rich A/F mixture” Definition:
Condition in which the ratio of air to fuel contains less oxygen than is needed to completely burn the quantity of fuel.
rich mixture
Glossary “rich mixture” Definition:
A/F mixture having insufficient air or excessive fuel. A mixture which has less than 14.7 parts of air for each part of fuel (by weight).
ride
Glossary “ride” Definition:
Term used to describe the quality of the ride that is produced by the suspension system.
ride and handling
Glossary “ride and handling” Definition:
1). Indication of the degree of comfort a tires or suspension system delivers to the driver. 2). Measure of the vehicle responsiveness in relation to the driver’s steering action.
rib
Glossary “rib” Definition:
Tread-section element around a tire; the raised section of the tread.
ribbon cellular radiator core
Glossary “ribbon cellular radiator core” Definition:
A type of radiator core that consists of ribbons of metal, usually copper (Cu), soldered together along their edges.
ribbon sealer
Glossary “ribbon sealer” Definition:
Sealer that comes in strip form and is applied by hand.
ribbon spring
Glossary “ribbon spring” Definition:
Spring designed to hold the sprags of a sprag-overrunning clutch at the correct angle for instantaneous engagement.
RG 240
Glossary “RG 240” Definition:
Repair Grade – used to describe equipment suitable for testing and diagnosing vehicle which have failed the I/M 240 test.
RH
Glossary “RH” Definition:
1). Right Hand. 2). Rhodium
rheostat
Glossary “rheostat” Definition:
A two- or three-terminal variable resistor used to regulate the voltage of an electrical current.