Glossary “relief valve” Definition:
A term used for compression valve or pressure relief valve.
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relieved
Glossary “relieved” Definition:
An engine in which the intake and exhaust passages have been cleaned of all obstructions and ridges.
release plate
Glossary “release plate” Definition:
Plate designed to release the clutch pressureplate’s loadong on the clutch driven disc.
reliability
Glossary “reliability” Definition:
A quality meaning dependable.
relay/quick-release valve
Glossary “relay/quick-release valve” Definition:
A valve, similar to a remote control foot valve, used on trucks with a wheel base of 254 inches (6.45 meters) or longer attached to an air tank to main supply line to speed the application and release of air to the service chambers.
release agent
Glossary “release agent” Definition:
Solvent used to soften adhesives or sealants.
release bearing
Glossary “release bearing” Definition:
Term used for throw out bearing.
release fingers
Glossary “release fingers” Definition:
Term used for release levers.
release levers
Glossary “release levers” Definition:
Lever type, pivoting pressure-plate device in the clutch assembly that is moved by throw out bearing movement, causing the clutch-spring pressure to be relieved so the clutch is released from the flywheel.
relative pressure
Glossary “relative pressure” Definition:
Difference between intake manifold pressure and the output pressure in a fuel-injection system.
relay
Glossary “relay” Definition:
Electro-mechanical switch having a coil and one or more sets of points. Also called an electromagnetic switch that uses a small amount of current from its control circuit to control a larger amount of current in its power circuit.
relay rod
Glossary “relay rod” Definition:
Term used for center link of a steering linkage system.
relative humidity
Glossary “relative humidity” Definition:
Moisture content of the surrounding air, and expressed as a percentage.
reheat principle
Glossary “reheat principle” Definition:
Principle that is used in automotive A/C systems to control in-car relative humidity by first cooling, then reheating the air.
reid vapor pressure (RVP)
Glossary “reid vapor pressure (RVP)” Definition:
Method of determining vapor pressure of gasoline and other petroleum products. Used as an indicator of the volatility of gasoline. The Reid Vapor Pressure of gasoline is the pressure of the vapor in a sealed gas tank when the fuel is raised to 100¡ãF and varies with altitude.
reinf
Glossary “reinf” Definition:
Acronym form of Reinforcement.
reinforced reaction injection molded polyurethane
Glossary “reinforced reaction injection molded polyurethane” Definition:
A two-part polyurethene composite plastic. Part “A” is the isocyanate. Part “B” contains reinforced fibers, resins, and a catalyst. The parts are mixed and injected into a mold.
relative compression testing
Glossary “relative compression testing” Definition:
Measuring the engines compression pressure relative to the amount of amperage required to turn the crankshaft during a cranking event. Using an engine analyzer in conjunction with an inductive amps probe. Compares the highest reading, which is assigned a value of 100%, to the other readings, which are assigned lower reading.
regular gasoline
Glossary “regular gasoline” Definition:
Gasoline that has an octane number near 87.
regular production option (RPO)
Glossary “regular production option (RPO)” Definition:
Items of new car equipment available to any buyer.